UBUNTU-CVE-2025-21959: Medium severity ubuntu/linux vulnerability
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconncount: Fully initialize struct nfconncounttuple in inserttree() Since commit b36e4523d4d5 ("netfilter: nfconncount: fix garbage collection confirm race"), cpu and jiffies32 were introduced to the struct nfconncounttuple. The commit made nfconncountadd() initialize conn->cpu and conn->jiffies32 when allocating the struct. In contrast, counttree() was not changed to initialize them. By commit 34848d5c896e ("netfilter: nfconncount: Split insert and traversal"), counttree() was split and the relevant allocation code now resides in inserttree(). Initialize conn->cpu and conn->jiffies32 in inserttree(). BUG: KMSAN: uninit-value in findorevict net/netfilter/nfconncount.c:117 [inline] BUG: KMSAN: uninit-value in nfconncountadd+0xd9c/0x2850 net/netfilter/nfconncount.c:143 findorevict net/netfilter/nfconncount.c:117 [inline] nfconncountadd+0xd9c/0x2850 net/netfilter/nfconncount.c:143 counttree net/netfilter/nfconncount.c:438 [inline] nfconncountcount+0x82f/0x1e80 net/netfilter/nfconncount.c:521 connlimitmt+0x7f6/0xbd0 net/netfilter/xtconnlimit.c:72 nftmatcheval net/netfilter/nftcompat.c:403 [inline] nftmatcheval+0x1a5/0x300 net/netfilter/nftcompat.c:433 exprcallopseval net/netfilter/nftablescore.c:240 [inline] nftdochain+0x426/0x2290 net/netfilter/nftablescore.c:288 nftdochainipv4+0x1a5/0x230 net/netfilter/nftchainfilter.c:23 nfhookentryhookfn include/linux/netfilter.h:154 [inline] nfhookslow+0xf4/0x400 net/netfilter/core.c:626 nfhookslowlist+0x24d/0x860 net/netfilter/core.c:663 NFHOOKLIST include/linux/netfilter.h:350 [inline] ipsublistrcv+0x17b7/0x17f0 net/ipv4/ipinput.c:633 iplistrcv+0x9ef/0xa40 net/ipv4/ipinput.c:669 netifreceiveskblistptype net/core/dev.c:5936 [inline] netifreceiveskblistcore+0x15c5/0x1670 net/core/dev.c:5983 netifreceiveskblist net/core/dev.c:6035 [inline] netifreceiveskblistinternal+0x1085/0x1700 net/core/dev.c:6126 netifreceiveskblist+0x5a/0x460 net/core/dev.c:6178 xdprecvframes net/bpf/testrun.c:280 [inline] xdptestrunbatch net/bpf/testrun.c:361 [inline] bpftestrunxdplive+0x2e86/0x3480 net/bpf/testrun.c:390 bpfprogtestrunxdp+0xf1d/0x1ae0 net/bpf/testrun.c:1316 bpfprogtestrun+0x5e5/0xa30 kernel/bpf/syscall.c:4407 sysbpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813 dosysbpf kernel/bpf/syscall.c:5902 [inline] sesysbpf kernel/bpf/syscall.c:5900 [inline] ia32sysbpf+0xa0/0xe0 kernel/bpf/syscall.c:5900 ia32syscall+0x394d/0x4180 arch/x86/include/generated/asm/syscalls32.h:358 dosyscall32irqson arch/x86/entry/common.c:165 [inline] dofastsyscall32+0xb0/0x110 arch/x86/entry/common.c:387 dofastsyscall32+0x38/0x80 arch/x86/entry/common.c:412 doSYSENTER32+0x1f/0x30 arch/x86/entry/common.c:450 entrySYSENTERcompatafterhwframe+0x84/0x8e Uninit was created at: slabpostallochook mm/slub.c:4121 [inline] slaballocnode mm/slub.c:4164 [inline] kmemcacheallocnoprof+0x915/0xe10 mm/slub.c:4171 inserttree net/netfilter/nfconncount.c:372 [inline] counttree net/netfilter/nfconncount.c:450 [inline] nfconncountcount+0x1415/0x1e80 net/netfilter/nfconncount.c:521 connlimitmt+0x7f6/0xbd0 net/netfilter/xtconnlimit.c:72 nftmatcheval net/netfilter/nftcompat.c:403 [inline] nftmatcheval+0x1a5/0x300 net/netfilter/nftcompat.c:433 exprcallopseval net/netfilter/nftablescore.c:240 [inline] nftdochain+0x426/0x2290 net/netfilter/nftablescore.c:288 nftdochainipv4+0x1a5/0x230 net/netfilter/nftchainfilter.c:23 nfhookentryhookfn include/linux/netfilter.h:154 [inline] nfhookslow+0xf4/0x400 net/netfilter/core.c:626 nfhookslowlist+0x24d/0x860 net/netfilter/core.c:663 NFHOOKLIST include/linux/netfilter.h:350 [inline] ipsublistrcv+0x17b7/0x17f0 net/ipv4/ipinput.c:633 iplistrcv+0x9ef/0xa40 net/ip ---truncated---
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1147.157~18.04.1 - Upgrade
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ubuntu/linux-azure-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1152.159~18.04.1 - Upgrade
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ubuntu/linux-gcp-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1150.159~18.04.1 - Upgrade
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ubuntu/linux-hwe-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-218.238~18.04.1 - Upgrade
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ubuntu/linux-raspi-5.4to a version that resolves this vulnerability.Fixed in 5.4.0-1130.143~18.04.1 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 5.4.0-1147.157 - Upgrade
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ubuntu/linux-aws-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1086.93~20.04.1 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 5.4.0-1152.159 - Upgrade
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ubuntu/linux-azure-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1091.100~20.04.1 - Upgrade
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ubuntu/linux-bluefieldto a version that resolves this vulnerability.Fixed in 5.4.0-1106.113 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 5.4.0-1150.159 - Upgrade
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ubuntu/linux-gcp-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1085.94~20.04.1 - Upgrade
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ubuntu/linux-hwe-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-142.152~20.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 5.4.0-1093.98 - Upgrade
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ubuntu/linux-ibm-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1078.81~20.04.1 - Upgrade
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ubuntu/linux-intel-iotg-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1083.89~20.04.1 - Upgrade
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ubuntu/linux-iotto a version that resolves this vulnerability.Fixed in 5.4.0-1051.54 - Upgrade
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ubuntu/linux-kvmto a version that resolves this vulnerability.Fixed in 5.4.0-1134.143 - Upgrade
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ubuntu/linux-lowlatency-hwe-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-142.152~20.04.1 - Upgrade
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ubuntu/linux-nvidia-tegra-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1039.39~20.04.1 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 5.4.0-1145.155 - Upgrade
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ubuntu/linux-oracle-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1083.89~20.04.1 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 5.4.0-1130.143 - Upgrade
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ubuntu/linux-riscv-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1081.85~20.04.1 - Upgrade
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ubuntu/linux-xilinx-zynqmpto a version that resolves this vulnerability.Fixed in 5.4.0-1065.69 - Upgrade
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 5.4.0-1147.157+fips1 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 5.4.0-1153.160+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 5.4.0-1121.131 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 5.4.0-1150.159+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 5.15.0-142.152 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 5.15.0-1086.93 - Upgrade
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ubuntu/linux-aws-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1039.41~22.04.1 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 5.15.0-1091.100 - Upgrade
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ubuntu/linux-azure-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1036.42~22.04.1 - Upgrade
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ubuntu/linux-azure-fdeto a version that resolves this vulnerability.Fixed in 5.15.0-1091.100.1 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 5.15.0-1085.94 - Upgrade
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ubuntu/linux-gcp-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1040.42~22.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 5.15.0-1083.89 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 5.15.0-1068.76 - Upgrade
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ubuntu/linux-hwe-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-85.85~22.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 5.15.0-1078.81 - Upgrade
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ubuntu/linux-intel-iotgto a version that resolves this vulnerability.Fixed in 5.15.0-1081.87 - Upgrade
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ubuntu/linux-kvmto a version that resolves this vulnerability.Fixed in 5.15.0-1082.87 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 5.15.0-142.152 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 5.15.0-1080.81 - Upgrade
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ubuntu/linux-nvidia-tegrato a version that resolves this vulnerability.Fixed in 5.15.0-1039.39 - Upgrade
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ubuntu/linux-nvidia-tegra-igxto a version that resolves this vulnerability.Fixed in 5.15.0-1028.28 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 5.15.0-1083.89 - Upgrade
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ubuntu/linux-oracle-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1037.38~22.04.1 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 5.15.0-1080.83 - Upgrade
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ubuntu/linux-riscv-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-84.84~22.04.1 - Upgrade
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ubuntu/linux-xilinx-zynqmpto a version that resolves this vulnerability.Fixed in 5.15.0-1050.54 - Upgrade
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ubuntu/linux-bluefieldto a version that resolves this vulnerability.Fixed in 5.15.0-1069.71 - Upgrade
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ubuntu/linux-intel-iot-realtimeto a version that resolves this vulnerability.Fixed in 5.15.0-1079.81 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 5.15.0-1086.95 - Upgrade
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ubuntu/linux-realtime-6.8to a version that resolves this vulnerability.Fixed in 6.8.1-1034.35~22.04.1 - Upgrade
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1086.93+fips1 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1091.100+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-142.152+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 5.15.0-1085.94+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.8.0-84.84 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1039.41 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.8.0-1038.44 - Upgrade
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ubuntu/linux-azure-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1018.18~24.04.1 - Upgrade
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ubuntu/linux-azure-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1025.27 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.8.0-1040.42 - Upgrade
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ubuntu/linux-gcp-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1016.16~24.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1036.40 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 6.8.0-1023.25 - Upgrade
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ubuntu/linux-hwe-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-28.28~24.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 6.8.0-1037.37 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-84.84.1 - Upgrade
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ubuntu/linux-lowlatency-hwe-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1015.16~24.04.2 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1039.42 - Upgrade
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ubuntu/linux-nvidia-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1012.12 - Upgrade
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ubuntu/linux-nvidia-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-1039.42.1 - Upgrade
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ubuntu/linux-nvidia-tegrato a version that resolves this vulnerability.Fixed in 6.8.0-1010.10 - Upgrade
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ubuntu/linux-oem-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1024.24 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1037.38 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.8.0-1039.43 - Upgrade
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ubuntu/linux-xilinxto a version that resolves this vulnerability.Fixed in 6.8.0-1018.19 - Upgrade
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ubuntu/linux-raspi-realtimeto a version that resolves this vulnerability.Fixed in 6.8.0-2030.31 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.8.1-1034.35 - Upgrade
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1039.41+fips1 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1040.46+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-84.84+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1040.42+fips1