UBUNTU-CVE-2025-37785: Use After Free

Q: Which Ubuntu kernel packages are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

Q: What condition triggers the out-of-bounds read?

The issue is triggered by mounting a corrupted ext4 filesystem containing a directory whose '.' entry has a rec_len equal to the block size. The out-of-bounds access occurs later when that corrupted directory is removed.

Q: Does exploitation depend on a normal ext4 directory layout?

No. The vulnerable code assumes that '.' and '..' entries fit in the first directory data block, but the malformed '.' entry can consume the entire block and cause the computed '..' entry pointer to fall outside the allocated block.

Published Apr 18, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved: ext4: fix OOB read when checking dotdot dir Mounting a corrupted filesystem with directory which contains '.' dir entry with reclen == block size results in out-of-bounds read (later on, when the corrupted directory is removed). ext4emptydir() assumes every ext4 directory contains at least '.' and '..' as directory entries in the first data block. It first loads the '.' dir entry, performs sanity checks by calling ext4checkdirentry() and then uses its reclen member to compute the location of '..' dir entry (in ext4nextentry). It assumes the '..' dir entry fits into the same data block. If the reclen of '.' is precisely one block (4KB), it slips through the sanity checks (it is considered the last directory entry in the data block) and leaves "struct ext4direntry2 de" point exactly past the memory slot allocated to the data block. The following call to ext4checkdirentry() on new value of de then dereferences this pointer which results in out-of-bounds mem access. Fix this by extending ext4checkdirentry() to check for '.' dir entries that reach the end of data block. Make sure to ignore the phony dir entries for checksum (by checking namelen for non-zero). Note: This is reported by KASAN as use-after-free in case another structure was recently freed from the slot past the bound, but it is really an OOB read. This issue was found by syzkaller tool. Call Trace: [ 38.594108] BUG: KASAN: slab-use-after-free in ext4checkdirentry+0x67e/0x710 [ 38.594649] Read of size 2 at addr ffff88802b41a004 by task syz-executor/5375 [ 38.595158] [ 38.595288] CPU: 0 UID: 0 PID: 5375 Comm: syz-executor Not tainted 6.14.0-rc7 #1 [ 38.595298] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 38.595304] Call Trace: [ 38.595308] <TASK> [ 38.595311] dumpstacklvl+0xa7/0xd0 [ 38.595325] printaddressdescription.constprop.0+0x2c/0x3f0 [ 38.595339] ? ext4checkdirentry+0x67e/0x710 [ 38.595349] printreport+0xaa/0x250 [ 38.595359] ? ext4checkdirentry+0x67e/0x710 [ 38.595368] ? kasanaddrtoslab+0x9/0x90 [ 38.595378] kasanreport+0xab/0xe0 [ 38.595389] ? ext4checkdirentry+0x67e/0x710 [ 38.595400] ext4checkdirentry+0x67e/0x710 [ 38.595410] ext4emptydir+0x465/0x990 [ 38.595421] ? pfxext4emptydir+0x10/0x10 [ 38.595432] ext4rmdir.part.0+0x29a/0xd10 [ 38.595441] ? dquotinitialize+0x2a7/0xbf0 [ 38.595455] ? pfxext4rmdir.part.0+0x10/0x10 [ 38.595464] ? pfxdquotinitialize+0x10/0x10 [ 38.595478] ? downwrite+0xdb/0x140 [ 38.595487] ? pfxdownwrite+0x10/0x10 [ 38.595497] ext4rmdir+0xee/0x140 [ 38.595506] vfsrmdir+0x209/0x670 [ 38.595517] ? lookuponeqstrexcl+0x3b/0x190 [ 38.595529] dormdir+0x363/0x3c0 [ 38.595537] ? pfxdormdir+0x10/0x10 [ 38.595544] ? strncpyfromuser+0x1ff/0x2e0 [ 38.595561] x64sysunlinkat+0xf0/0x130 [ 38.595570] dosyscall64+0x5b/0x180 [ 38.595583] entrySYSCALL64afterhwframe+0x76/0x7e

Affected Software

214 affected componentsFixes available

ubuntu/linux*

ubuntu/linux-aws<4.4.0-1148.154

4.4.0-1148.154

ubuntu/linux-azure<4.15.0-1193.208~14.04.1

4.15.0-1193.208~14.04.1

ubuntu/linux-lts-xenial<4.4.0-273.307~14.04.1

4.4.0-273.307~14.04.1

ubuntu/linux<4.4.0-273.307

4.4.0-273.307

ubuntu/linux-aws<4.4.0-1186.201

4.4.0-1186.201

ubuntu/linux-aws-hwe<4.15.0-1185.198~16.04.1

4.15.0-1185.198~16.04.1

ubuntu/linux-azure<4.15.0-1193.208~16.04.1

4.15.0-1193.208~16.04.1

ubuntu/linux-gcp<4.15.0-1178.195~16.04.1

4.15.0-1178.195~16.04.1

ubuntu/linux-hwe<4.15.0-242.254~16.04.1

4.15.0-242.254~16.04.1

ubuntu/linux-kvm<4.4.0-1149.160

4.4.0-1149.160

ubuntu/linux-oracle<4.15.0-1148.159~16.04.1

4.15.0-1148.159~16.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-fips<4.4.0-1119.126

4.4.0-1119.126

ubuntu/linux-fips*

ubuntu/linux<4.15.0-242.254

4.15.0-242.254

ubuntu/linux-aws<4.15.0-1185.198

4.15.0-1185.198

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1151.161~18.04.1

5.4.0-1151.161~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15<4.15.0-1193.208

4.15.0-1193.208

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1154.161~18.04.1

5.4.0-1154.161~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15<4.15.0-1178.195

4.15.0-1178.195

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1154.163~18.04.1

5.4.0-1154.163~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-222.242~18.04.1

5.4.0-222.242~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1097.102~18.04.1

5.4.0-1097.102~18.04.1

ubuntu/linux-kvm<4.15.0-1168.173

4.15.0-1168.173

ubuntu/linux-oem*

ubuntu/linux-oracle<4.15.0-1147.158

4.15.0-1147.158

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1149.159~18.04.1

5.4.0-1149.159~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1134.147~18.04.1

5.4.0-1134.147~18.04.1

ubuntu/linux-aws-fips<4.15.0-2123.129

4.15.0-2123.129

ubuntu/linux-azure-fips<4.15.0-2102.108

4.15.0-2102.108

ubuntu/linux-fips<4.15.0-1140.151

4.15.0-1140.151

ubuntu/linux-gcp-fips<4.15.0-2086.92

4.15.0-2086.92

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-222.242

5.4.0-222.242

ubuntu/linux-aws<5.4.0-1151.161

5.4.0-1151.161

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.15<5.15.0-1086.93~20.04.1

5.15.0-1086.93~20.04.1

ubuntu/linux-aws-5.8*

ubuntu/linux-azure<5.4.0-1154.161

5.4.0-1154.161

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.15<5.15.0-1091.100~20.04.1

5.15.0-1091.100~20.04.1

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-bluefield<5.4.0-1110.117

5.4.0-1110.117

ubuntu/linux-gcp<5.4.0-1154.163

5.4.0-1154.163

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.15<5.15.0-1085.94~20.04.1

5.15.0-1085.94~20.04.1

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.15<5.15.0-142.152~20.04.1

5.15.0-142.152~20.04.1

ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm<5.4.0-1097.102

5.4.0-1097.102

ubuntu/linux-ibm-5.15<5.15.0-1078.81~20.04.1

5.15.0-1078.81~20.04.1

ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1083.89~20.04.1

5.15.0-1083.89~20.04.1

ubuntu/linux-iot<5.4.0-1055.58

5.4.0-1055.58

ubuntu/linux-kvm<5.4.0-1138.147

5.4.0-1138.147

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-142.152~20.04.1

5.15.0-142.152~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1039.39~20.04.1

5.15.0-1039.39~20.04.1

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle<5.4.0-1149.159

5.4.0-1149.159

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.15<5.15.0-1083.89~20.04.1

5.15.0-1083.89~20.04.1

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi<5.4.0-1134.147

5.4.0-1134.147

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.15<5.15.0-1081.85~20.04.1

5.15.0-1081.85~20.04.1

ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp<5.4.0-1069.73

5.4.0-1069.73

ubuntu/linux-aws-fips<5.4.0-1151.161+fips1

5.4.0-1151.161+fips1

ubuntu/linux-azure-fips<5.4.0-1155.162+fips1

5.4.0-1155.162+fips1

ubuntu/linux-fips<5.4.0-1125.135

5.4.0-1125.135

ubuntu/linux-gcp-fips<5.4.0-1154.163+fips1

5.4.0-1154.163+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-142.152

5.15.0-142.152

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1086.93

5.15.0-1086.93

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1040.42~22.04.1

6.8.0-1040.42~22.04.1

ubuntu/linux-azure<5.15.0-1091.100

5.15.0-1091.100

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1040.46~22.04.1

6.8.0-1040.46~22.04.1

ubuntu/linux-azure-fde<5.15.0-1091.100.1

5.15.0-1091.100.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1085.94

5.15.0-1085.94

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1041.43~22.04.1

6.8.0-1041.43~22.04.1

ubuntu/linux-gke<5.15.0-1083.89

5.15.0-1083.89

ubuntu/linux-gkeop<5.15.0-1068.76

5.15.0-1068.76

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-85.85~22.04.1

6.8.0-85.85~22.04.1

ubuntu/linux-ibm<5.15.0-1078.81

5.15.0-1078.81

ubuntu/linux-ibm-6.8<6.8.0-1038.38~22.04.1

6.8.0-1038.38~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1081.87

5.15.0-1081.87

ubuntu/linux-kvm<5.15.0-1082.87

5.15.0-1082.87

ubuntu/linux-lowlatency<5.15.0-142.152

5.15.0-142.152

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-85.85.1~22.04.1

6.8.0-85.85.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1080.81

5.15.0-1080.81

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1040.43~22.04.1

6.8.0-1040.43~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1039.39

5.15.0-1039.39

ubuntu/linux-nvidia-tegra-igx<5.15.0-1028.28

5.15.0-1028.28

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1083.89

5.15.0-1083.89

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1037.38~22.04.1

6.8.0-1037.38~22.04.1

ubuntu/linux-raspi<5.15.0-1080.83

5.15.0-1080.83

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-86.87~22.04.1

6.8.0-86.87~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1050.54

5.15.0-1050.54

ubuntu/linux-bluefield<5.15.0-1069.71

5.15.0-1069.71

ubuntu/linux-intel-iot-realtime<5.15.0-1079.81

5.15.0-1079.81

ubuntu/linux-realtime<5.15.0-1086.95

5.15.0-1086.95

ubuntu/linux-realtime-6.8<6.8.1-1035.36~22.04.1

6.8.1-1035.36~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1086.93+fips1

5.15.0-1086.93+fips1

ubuntu/linux-azure-fips<5.15.0-1091.100+fips1

5.15.0-1091.100+fips1

ubuntu/linux-fips<5.15.0-142.152+fips1

5.15.0-142.152+fips1

ubuntu/linux-gcp-fips<5.15.0-1085.94+fips1

5.15.0-1085.94+fips1

ubuntu/linux<6.8.0-85.85

6.8.0-85.85

ubuntu/linux-aws<6.8.0-1040.42

6.8.0-1040.42

ubuntu/linux-azure<6.8.0-1040.46

6.8.0-1040.46

ubuntu/linux-azure-6.11<6.11.0-1018.18~24.04.1

6.11.0-1018.18~24.04.1

ubuntu/linux-azure-nvidia<6.8.0-1025.27

6.8.0-1025.27

ubuntu/linux-gcp<6.8.0-1041.43

6.8.0-1041.43

ubuntu/linux-gcp-6.11<6.11.0-1016.16~24.04.1

6.11.0-1016.16~24.04.1

ubuntu/linux-gke<6.8.0-1037.41

6.8.0-1037.41

ubuntu/linux-gkeop<6.8.0-1024.26

6.8.0-1024.26

ubuntu/linux-hwe-6.11<6.11.0-28.28~24.04.1

6.11.0-28.28~24.04.1

ubuntu/linux-ibm<6.8.0-1038.38

6.8.0-1038.38

ubuntu/linux-intel*

ubuntu/linux-lowlatency<6.8.0-85.85.1

6.8.0-85.85.1

ubuntu/linux-lowlatency-hwe-6.11<6.11.0-1015.16~24.04.2

6.11.0-1015.16~24.04.2

ubuntu/linux-nvidia<6.8.0-1040.43

6.8.0-1040.43

ubuntu/linux-nvidia-6.11<6.11.0-1012.12

6.11.0-1012.12

ubuntu/linux-nvidia-lowlatency<6.8.0-1040.43.1

6.8.0-1040.43.1

ubuntu/linux-nvidia-tegra<6.8.0-1012.12

6.8.0-1012.12

ubuntu/linux-oem-6.11<6.11.0-1024.24

6.11.0-1024.24

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1037.38

6.8.0-1037.38

ubuntu/linux-raspi<6.8.0-1040.44

6.8.0-1040.44

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-xilinx<6.8.0-1018.19

6.8.0-1018.19

ubuntu/linux-bluefield<6.8.0-1012.16

6.8.0-1012.16

ubuntu/linux-raspi-realtime<6.8.0-2031.32

6.8.0-2031.32

ubuntu/linux-realtime<6.8.1-1035.36

6.8.1-1035.36

ubuntu/linux-aws-fips<6.8.0-1040.42+fips1

6.8.0-1040.42+fips1

ubuntu/linux-azure-fips<6.8.0-1040.46+fips1

6.8.0-1040.46+fips1

ubuntu/linux-fips<6.8.0-85.85+fips1

6.8.0-85.85+fips1

ubuntu/linux-gcp-fips<6.8.0-1041.43+fips1

6.8.0-1041.43+fips1

ubuntu/linux-azure-fde*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1148.154
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1193.208~14.04.1
Upgrade
Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.
Fixed in 4.4.0-273.307~14.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.4.0-273.307
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.4.0-1186.201
Upgrade
Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-1185.198~16.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 4.15.0-1193.208~16.04.1
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 4.15.0-1178.195~16.04.1
Upgrade
Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.
Fixed in 4.15.0-242.254~16.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.4.0-1149.160
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1148.159~16.04.1
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.4.0-1119.126
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 4.15.0-242.254
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 4.15.0-1185.198
Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1193.208
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.161~18.04.1
Upgrade
Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.
Fixed in 4.15.0-1178.195
Upgrade
Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.163~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-222.242~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1097.102~18.04.1
Upgrade
Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 4.15.0-1168.173
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 4.15.0-1147.158
Upgrade
Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1149.159~18.04.1
Upgrade
Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1134.147~18.04.1
Upgrade
Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2123.129
Upgrade
Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2102.108
Upgrade
Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-1140.151
Upgrade
Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 4.15.0-2086.92
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-222.242
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1151.161
Upgrade
Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1086.93~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1154.161
Upgrade
Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1091.100~20.04.1
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Fixed in 5.4.0-1110.117
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Fixed in 5.4.0-1154.163
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Fixed in 5.15.0-1085.94~20.04.1
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Fixed in 5.15.0-142.152~20.04.1
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Fixed in 5.4.0-1097.102
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Fixed in 5.15.0-1078.81~20.04.1
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Fixed in 5.15.0-1083.89~20.04.1
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Fixed in 5.4.0-1055.58
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Fixed in 5.4.0-1138.147
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Fixed in 5.15.0-142.152~20.04.1
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Fixed in 5.15.0-1039.39~20.04.1
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Fixed in 5.4.0-1149.159
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Fixed in 5.15.0-1083.89~20.04.1
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Fixed in 5.4.0-1134.147
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Fixed in 5.15.0-1081.85~20.04.1
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Fixed in 5.4.0-1069.73
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Fixed in 5.4.0-1151.161+fips1
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Fixed in 5.4.0-1155.162+fips1
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Fixed in 5.4.0-1125.135
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Fixed in 5.4.0-1154.163+fips1
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Fixed in 5.15.0-142.152
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Fixed in 5.15.0-1086.93
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Fixed in 6.8.0-1040.42~22.04.1
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Fixed in 5.15.0-1091.100
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Fixed in 6.8.0-1040.46~22.04.1
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Fixed in 5.15.0-1091.100.1
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Fixed in 5.15.0-1085.94
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Fixed in 6.8.0-1041.43~22.04.1
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Fixed in 5.15.0-1083.89
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Fixed in 5.15.0-1068.76
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Fixed in 6.8.0-85.85~22.04.1
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Fixed in 5.15.0-1078.81
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Fixed in 6.8.0-1038.38~22.04.1
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Fixed in 5.15.0-1081.87
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Fixed in 5.15.0-1082.87
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Fixed in 5.15.0-142.152
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Fixed in 6.8.0-85.85.1~22.04.1
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Fixed in 5.15.0-1080.81
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Fixed in 6.8.0-1040.43~22.04.1
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Fixed in 5.15.0-1039.39
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Fixed in 5.15.0-1028.28
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Fixed in 5.15.0-1083.89
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Fixed in 6.8.0-1037.38~22.04.1
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Fixed in 5.15.0-1080.83
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Fixed in 6.8.0-86.87~22.04.1
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Fixed in 5.15.0-1050.54
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Fixed in 5.15.0-1069.71
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Fixed in 5.15.0-1079.81
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Fixed in 5.15.0-1086.95
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Fixed in 6.8.1-1035.36~22.04.1
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Fixed in 5.15.0-1086.93+fips1
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Fixed in 5.15.0-1091.100+fips1
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Fixed in 5.15.0-142.152+fips1
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Fixed in 5.15.0-1085.94+fips1
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Fixed in 6.8.0-85.85
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Fixed in 6.8.0-1040.42
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Fixed in 6.8.0-1040.46
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Fixed in 6.11.0-1018.18~24.04.1
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Fixed in 6.8.0-1025.27
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Fixed in 6.8.0-1041.43
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Fixed in 6.11.0-1016.16~24.04.1
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Fixed in 6.8.0-1037.41
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Fixed in 6.8.0-1024.26
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Fixed in 6.11.0-28.28~24.04.1
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Fixed in 6.8.0-1038.38
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Fixed in 6.8.0-85.85.1
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Fixed in 6.11.0-1015.16~24.04.2
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Fixed in 6.8.0-1040.43
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Fixed in 6.11.0-1012.12
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Fixed in 6.8.0-1040.43.1
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Fixed in 6.8.0-1012.12
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Fixed in 6.11.0-1024.24
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Fixed in 6.8.0-1037.38
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Fixed in 6.8.0-1040.44
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Fixed in 6.8.0-1018.19
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Fixed in 6.8.0-1012.16
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Fixed in 6.8.0-2031.32
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Fixed in 6.8.1-1035.36
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Fixed in 6.8.0-1040.42+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1040.46+fips1
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Fixed in 6.8.0-85.85+fips1
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Fixed in 6.8.0-1041.43+fips1

Event History

Apr 18, 2025

CVE Published

via OSV·07:15 AM

Data Sourced

via OSV·07:15 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

The listed packages are ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-fips, ubuntu/linux-aws-fips, ubuntu/linux-azure-fips, and ubuntu/linux-gcp-fips.

What condition triggers the out-of-bounds read?

The issue is triggered by mounting a corrupted ext4 filesystem containing a directory whose '.' entry has a rec_len equal to the block size. The out-of-bounds access occurs later when that corrupted directory is removed.

Does exploitation depend on a normal ext4 directory layout?

No. The vulnerable code assumes that '.' and '..' entries fit in the first directory data block, but the malformed '.' entry can consume the entire block and cause the computed '..' entry pointer to fall outside the allocated block.

UBUNTU-CVE-2025-37785: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

What condition triggers the out-of-bounds read?

Does exploitation depend on a normal ext4 directory layout?

Company

Resources

Contact

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

What condition triggers the out-of-bounds read?

Does exploitation depend on a normal ext4 directory layout?