UBUNTU-CVE-2024-49884: Use After Free

Q: Which Ubuntu kernel packages are listed as affected?

The affected software list includes ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, and the linux-fips variants for the base, AWS, Azure, and GCP kernels.

Q: What conditions are reflected in the severity vector for exploitation?

The vector indicates local access, low privileges, no user interaction, high attack complexity, and an additional attack requirement. It rates confidentiality, integrity, and availability impact as high, with no impact on a subsequent system.

Q: What kernel activity is associated with the reported failure?

The use-after-free was reported in ext4_split_extent_at() during ext4 extent splitting and conversion while handling unwritten extents. The shown call trace reaches this path through ext4 writeback operations, including ext4_do_writepages().

Q: How can administrators identify the failure if it has already occurred?

The reported symptom is a KASAN slab-use-after-free report naming ext4_split_extent_at(), with a read of freed memory. Related stack frames include ext4_split_convert_extents, ext4_ext_handle_unwritten_extents, ext4_ext_map_blocks, and ext4_do_writepages().

Published Oct 21, 2024

Updated

In the Linux kernel, the following vulnerability has been resolved: ext4: fix slab-use-after-free in ext4splitextentat() We hit the following use-after-free: ================================================================== BUG: KASAN: slab-use-after-free in ext4splitextentat+0xba8/0xcc0 Read of size 2 at addr ffff88810548ed08 by task kworker/u20:0/40 CPU: 0 PID: 40 Comm: kworker/u20:0 Not tainted 6.9.0-dirty #724 Call Trace: <TASK> kasanreport+0x93/0xc0 ext4splitextentat+0xba8/0xcc0 ext4splitextent.isra.0+0x18f/0x500 ext4splitconvertextents+0x275/0x750 ext4exthandleunwrittenextents+0x73e/0x1580 ext4extmapblocks+0xe20/0x2dc0 ext4mapblocks+0x724/0x1700 ext4dowritepages+0x12d6/0x2a70 [...] Allocated by task 40: kmallocnoprof+0x1ac/0x480 ext4findextent+0xf3b/0x1e70 ext4extmapblocks+0x188/0x2dc0 ext4mapblocks+0x724/0x1700 ext4dowritepages+0x12d6/0x2a70 [...] Freed by task 40: kfree+0xf1/0x2b0 ext4findextent+0xa71/0x1e70 ext4extinsertextent+0xa22/0x3260 ext4splitextentat+0x3ef/0xcc0 ext4splitextent.isra.0+0x18f/0x500 ext4splitconvertextents+0x275/0x750 ext4exthandleunwrittenextents+0x73e/0x1580 ext4extmapblocks+0xe20/0x2dc0 ext4mapblocks+0x724/0x1700 ext4dowritepages+0x12d6/0x2a70 [...] ================================================================== The flow of issue triggering is as follows: ext4splitextentat path = ppath ext4extinsertextent(ppath) ext4extcreatenewleaf(ppath) ext4findextent(origpath) path = origpath readextenttreeblock // return -ENOMEM or -EIO ext4freeextpath(path) kfree(path) origpath = NULL a. If err is -ENOMEM: ext4extdirty(path + path->pdepth) // path use-after-free !!! b. If err is -EIO and we have EXTDEBUG defined: ext4extshowleaf(path) eh = path[depth].phdr // path also use-after-free !!! So when trying to zeroout or fix the extent length, call ext4findextent() to update the path. In addition we use ppath directly as an ext4extshowleaf() input to avoid possible use-after-free when EXTDEBUG is defined, and to avoid unnecessary path updates.

Affected Software

201 affected componentsFixes available

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4<5.4.0-1142.152~18.04.1

5.4.0-1142.152~18.04.1

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4<5.4.0-1147.154~18.04.1

5.4.0-1147.154~18.04.1

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gcp-5.4<5.4.0-1145.154~18.04.1

5.4.0-1145.154~18.04.1

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-5.4<5.4.0-211.231~18.04.1

5.4.0-211.231~18.04.1

ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4<5.4.0-1090.95~18.04.1

5.4.0-1090.95~18.04.1

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4<5.4.0-1140.149~18.04.1

5.4.0-1140.149~18.04.1

ubuntu/linux-raspi-5.4<5.4.0-1129.142~18.04.1

5.4.0-1129.142~18.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.4.0-211.231

5.4.0-211.231

ubuntu/linux-aws<5.4.0-1142.152

5.4.0-1142.152

ubuntu/linux-aws-5.15<5.15.0-1073.79~20.04.1

5.15.0-1073.79~20.04.1

ubuntu/linux-azure<5.4.0-1147.154

5.4.0-1147.154

ubuntu/linux-azure-5.15<5.15.0-1078.87~20.04.1

5.15.0-1078.87~20.04.1

ubuntu/linux-bluefield<5.4.0-1101.108

5.4.0-1101.108

ubuntu/linux-gcp<5.4.0-1145.154

5.4.0-1145.154

ubuntu/linux-gcp-5.15<5.15.0-1072.80~20.04.1

5.15.0-1072.80~20.04.1

ubuntu/linux-hwe-5.15<5.15.0-127.137~20.04.1

5.15.0-127.137~20.04.1

ubuntu/linux-ibm<5.4.0-1088.93

5.4.0-1088.93

ubuntu/linux-ibm-5.15<5.15.0-1066.69~20.04.1

5.15.0-1066.69~20.04.1

ubuntu/linux-intel-iotg-5.15<5.15.0-1071.77~20.04.1

5.15.0-1071.77~20.04.1

ubuntu/linux-iot<5.4.0-1048.51

5.4.0-1048.51

ubuntu/linux-kvm<5.4.0-1129.138

5.4.0-1129.138

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-127.137~20.04.1

5.15.0-127.137~20.04.1

ubuntu/linux-nvidia-tegra-5.15<5.15.0-1032.32~20.04.1

5.15.0-1032.32~20.04.1

ubuntu/linux-oracle<5.4.0-1140.150

5.4.0-1140.150

ubuntu/linux-oracle-5.15<5.15.0-1071.77~20.04.1

5.15.0-1071.77~20.04.1

ubuntu/linux-raspi<5.4.0-1129.142

5.4.0-1129.142

ubuntu/linux-riscv-5.15<5.15.0-1069.73~20.04.1

5.15.0-1069.73~20.04.1

ubuntu/linux-xilinx-zynqmp<5.4.0-1060.64

5.4.0-1060.64

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

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-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux-aws-fips<5.4.0-1142.153+fips1

5.4.0-1142.153+fips1

ubuntu/linux-azure-fips<5.4.0-1147.154+fips1

5.4.0-1147.154+fips1

ubuntu/linux-fips<5.4.0-1116.126

5.4.0-1116.126

ubuntu/linux-gcp-fips<5.4.0-1145.154+fips1

5.4.0-1145.154+fips1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-127.137

5.15.0-127.137

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws<5.15.0-1073.79

5.15.0-1073.79

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8<6.8.0-1023.25~22.04.1

6.8.0-1023.25~22.04.1

ubuntu/linux-azure<5.15.0-1078.87

5.15.0-1078.87

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8<6.8.0-1025.30~22.04.1

6.8.0-1025.30~22.04.1

ubuntu/linux-azure-fde<5.15.0-1078.87.1

5.15.0-1078.87.1

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-gcp<5.15.0-1072.80

5.15.0-1072.80

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1024.26~22.04.1

6.8.0-1024.26~22.04.1

ubuntu/linux-gke<5.15.0-1070.76

5.15.0-1070.76

ubuntu/linux-gkeop<5.15.0-1056.63

5.15.0-1056.63

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-57.59~22.04.1

6.8.0-57.59~22.04.1

ubuntu/linux-ibm<5.15.0-1066.69

5.15.0-1066.69

ubuntu/linux-ibm-6.8<6.8.0-1023.23~22.04.1

6.8.0-1023.23~22.04.1

ubuntu/linux-intel-iotg<5.15.0-1071.77

5.15.0-1071.77

ubuntu/linux-kvm<5.15.0-1070.75

5.15.0-1070.75

ubuntu/linux-lowlatency<5.15.0-127.137

5.15.0-127.137

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-54.56.1~22.04.1

6.8.0-54.56.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1068.69

5.15.0-1068.69

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1022.25~22.04.2

6.8.0-1022.25~22.04.2

ubuntu/linux-nvidia-tegra<5.15.0-1032.32

5.15.0-1032.32

ubuntu/linux-nvidia-tegra-igx<5.15.0-1020.20

5.15.0-1020.20

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1071.77

5.15.0-1071.77

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1020.21~22.04.1

6.8.0-1020.21~22.04.1

ubuntu/linux-raspi<5.15.0-1066.69

5.15.0-1066.69

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-53.55.1~22.04.1

6.8.0-53.55.1~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1039.43

5.15.0-1039.43

ubuntu/linux-bluefield<5.15.0-1057.59

5.15.0-1057.59

ubuntu/linux-intel-iot-realtime<5.15.0-1066.68

5.15.0-1066.68

ubuntu/linux-realtime<5.15.0-1074.82

5.15.0-1074.82

ubuntu/linux-realtime-6.8<6.8.1-1016.17~22.04.1

6.8.1-1016.17~22.04.1

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips<5.15.0-1073.79+fips1

5.15.0-1073.79+fips1

ubuntu/linux-azure-fips<5.15.0-1078.87+fips1

5.15.0-1078.87+fips1

ubuntu/linux-fips<5.15.0-127.137+fips1

5.15.0-127.137+fips1

ubuntu/linux-gcp-fips<5.15.0-1072.80+fips1

5.15.0-1072.80+fips1

ubuntu/linux<6.8.0-54.56

6.8.0-54.56

ubuntu/linux-aws<6.8.0-1023.25

6.8.0-1023.25

ubuntu/linux-azure<6.8.0-1025.30

6.8.0-1025.30

ubuntu/linux-azure-6.11<6.11.0-1012.12~24.04.1

6.11.0-1012.12~24.04.1

ubuntu/linux-azure-nvidia<6.8.0-1014.15

6.8.0-1014.15

ubuntu/linux-gcp<6.8.0-1024.26

6.8.0-1024.26

ubuntu/linux-gcp-6.11<6.11.0-1011.11~24.04.1

6.11.0-1011.11~24.04.1

ubuntu/linux-gke<6.8.0-1019.23

6.8.0-1019.23

ubuntu/linux-gkeop<6.8.0-1006.8

6.8.0-1006.8

ubuntu/linux-ibm<6.8.0-1022.22

6.8.0-1022.22

ubuntu/linux-lowlatency<6.8.0-54.56.1

6.8.0-54.56.1

ubuntu/linux-nvidia<6.8.0-1022.25

6.8.0-1022.25

ubuntu/linux-nvidia-6.11<6.11.0-1007.7

6.11.0-1007.7

ubuntu/linux-nvidia-lowlatency<6.8.0-1022.25.2

6.8.0-1022.25.2

ubuntu/linux-oem-6.11<6.11.0-1015.15

6.11.0-1015.15

ubuntu/linux-oem-6.8<6.8.0-1024.24

6.8.0-1024.24

ubuntu/linux-oracle<6.8.0-1020.21

6.8.0-1020.21

ubuntu/linux-raspi<6.8.0-1019.23

6.8.0-1019.23

ubuntu/linux-realtime*

ubuntu/linux-riscv<6.8.0-53.55.1

6.8.0-53.55.1

ubuntu/linux-xilinx<6.8.0-1017.18

6.8.0-1017.18

ubuntu/linux-raspi-realtime<6.8.0-2018.19

6.8.0-2018.19

ubuntu/linux-realtime<6.8.1-1016.17

6.8.1-1016.17

ubuntu/linux-fips<6.8.0-78.78+fips1

6.8.0-78.78+fips1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1142.152~18.04.1
Upgrade
Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1147.154~18.04.1
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Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1145.154~18.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-211.231~18.04.1
Upgrade
Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1090.95~18.04.1
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Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.149~18.04.1
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Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.
Fixed in 5.4.0-1129.142~18.04.1
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Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 5.4.0-211.231
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Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 5.4.0-1142.152
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Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1073.79~20.04.1
Upgrade
Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.
Fixed in 5.4.0-1147.154
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Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1078.87~20.04.1
Upgrade
Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 5.4.0-1101.108
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Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 5.4.0-1145.154
Upgrade
Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1072.80~20.04.1
Upgrade
Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-127.137~20.04.1
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Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 5.4.0-1088.93
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Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1066.69~20.04.1
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Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1071.77~20.04.1
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Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.
Fixed in 5.4.0-1048.51
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Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.4.0-1129.138
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Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-127.137~20.04.1
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Fixed in 5.15.0-1032.32~20.04.1
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.4.0-1140.150
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Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1071.77~20.04.1
Upgrade
Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.
Fixed in 5.4.0-1129.142
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Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.
Fixed in 5.15.0-1069.73~20.04.1
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Fixed in 5.4.0-1060.64
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Fixed in 5.4.0-1142.153+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1147.154+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1116.126
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Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 5.4.0-1145.154+fips1
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Fixed in 5.15.0-127.137
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Fixed in 5.15.0-1073.79
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Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1023.25~22.04.1
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Fixed in 5.15.0-1078.87
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Fixed in 6.8.0-1025.30~22.04.1
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Fixed in 5.15.0-1078.87.1
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Fixed in 5.15.0-1072.80
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Fixed in 6.8.0-1024.26~22.04.1
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Fixed in 5.15.0-1070.76
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Fixed in 5.15.0-1056.63
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Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-57.59~22.04.1
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Fixed in 5.15.0-1066.69
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Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1023.23~22.04.1
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Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.
Fixed in 5.15.0-1071.77
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Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.
Fixed in 5.15.0-1070.75
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Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.
Fixed in 5.15.0-127.137
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Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-54.56.1~22.04.1
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Fixed in 5.15.0-1068.69
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Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1022.25~22.04.2
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Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.
Fixed in 5.15.0-1032.32
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Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.
Fixed in 5.15.0-1020.20
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Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 5.15.0-1071.77
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Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-1020.21~22.04.1
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Fixed in 5.15.0-1066.69
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Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.0-53.55.1~22.04.1
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Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.
Fixed in 5.15.0-1039.43
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Fixed in 5.15.0-1057.59
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Fixed in 5.15.0-1066.68
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Fixed in 5.15.0-1074.82
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Fixed in 6.8.1-1016.17~22.04.1
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Fixed in 5.15.0-1073.79+fips1
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Fixed in 5.15.0-1078.87+fips1
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Fixed in 5.15.0-127.137+fips1
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Fixed in 5.15.0-1072.80+fips1
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Fixed in 6.8.0-54.56
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Fixed in 6.8.0-1023.25
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Fixed in 6.8.0-1025.30
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Fixed in 6.11.0-1012.12~24.04.1
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Fixed in 6.8.0-1014.15
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Fixed in 6.8.0-1024.26
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Fixed in 6.11.0-1011.11~24.04.1
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Fixed in 6.8.0-1019.23
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Fixed in 6.8.0-1006.8
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Fixed in 6.8.0-1022.22
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Fixed in 6.8.0-54.56.1
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Fixed in 6.8.0-1022.25
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Fixed in 6.11.0-1007.7
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Fixed in 6.8.0-1022.25.2
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Fixed in 6.11.0-1015.15
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Fixed in 6.8.0-1024.24
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Fixed in 6.8.0-1020.21
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Fixed in 6.8.0-1019.23
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Fixed in 6.8.0-53.55.1
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Fixed in 6.8.0-1017.18
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Fixed in 6.8.0-2018.19
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Fixed in 6.8.1-1016.17
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Fixed in 6.8.0-78.78+fips1
Compensating control
In ext4_split_extent_at(), use *ppath directly as the ext4_ext_show_leaf() input to avoid use-after-free and unnecessary path updates; when zeroing out or fixing the extent length, call ext4_find_extent() to update the path.

Event History

Oct 21, 2024

CVE Published

via OSV·06:15 PM

Data Sourced

via OSV·06:15 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

The affected software list includes ubuntu/linux, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, and the linux-fips variants for the base, AWS, Azure, and GCP kernels.

What conditions are reflected in the severity vector for exploitation?

The vector indicates local access, low privileges, no user interaction, high attack complexity, and an additional attack requirement. It rates confidentiality, integrity, and availability impact as high, with no impact on a subsequent system.

What kernel activity is associated with the reported failure?

The use-after-free was reported in ext4_split_extent_at() during ext4 extent splitting and conversion while handling unwritten extents. The shown call trace reaches this path through ext4 writeback operations, including ext4_do_writepages().

How can administrators identify the failure if it has already occurred?

The reported symptom is a KASAN slab-use-after-free report naming ext4_split_extent_at(), with a read of freed memory. Related stack frames include ext4_split_convert_extents, ext4_ext_handle_unwritten_extents, ext4_ext_map_blocks, and ext4_do_writepages().

UBUNTU-CVE-2024-49884: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Which Ubuntu kernel packages are listed as affected?

What conditions are reflected in the severity vector for exploitation?

What kernel activity is associated with the reported failure?

How can administrators identify the failure if it has already occurred?

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