CVE-2026-43139 (GCVE-0-2026-43139)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-10-19 19:16
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix uninitialized saddr in xfrm6_get_saddr() xfrm6_get_saddr() does not check the return value of ipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable source address (returns -EADDRNOTAVAIL), saddr->in6 is left uninitialized, but xfrm6_get_saddr() still returns 0 (success). This causes the caller xfrm_tmpl_resolve_one() to use the uninitialized address in xfrm_state_find(), triggering KMSAN warning: ===================================================== BUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940 xfrm_state_find+0x2424/0xa940 xfrm_resolve_and_create_bundle+0x906/0x5a20 xfrm_lookup_with_ifid+0xcc0/0x3770 xfrm_lookup_route+0x63/0x2b0 ip_route_output_flow+0x1ce/0x270 udp_sendmsg+0x2ce1/0x3400 inet_sendmsg+0x1ef/0x2a0 __sock_sendmsg+0x278/0x3d0 __sys_sendto+0x593/0x720 __x64_sys_sendto+0x130/0x200 x64_sys_call+0x332b/0x3e70 do_syscall_64+0xd3/0xf80 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable tmp.i.i created at: xfrm_resolve_and_create_bundle+0x3e3/0x5a20 xfrm_lookup_with_ifid+0xcc0/0x3770 ===================================================== Fix by checking the return value of ipv6_dev_get_saddr() and propagating the error.
References
Impacted products
Vendor Product Version
Linux Linux Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
Version: a1e59abf824969554b90facd44a4ab16e265afa4
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    "dateUpdated": "2026-10-19T19:16:22.034Z",
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It does not cross a VM, IOMMU, or separate security scope boundary.\\nC:L - The uninitialized value is a bounded 16-byte IPv6 source address from kernel stack, used in hashes/comparisons and potentially copied into XFRM acquire state/messages. This is limited kernel memory disclosure, not an arbitrary read primitive.\\nI:L - The uninitialized source address can influence XFRM state lookup/acquire behavior and create or notify state using an unintended local tunnel endpoint. This is limited integrity impact to IPsec/XFRM state handling, not arbitrary modification.\\nA:H - Syzbot reported a kernel BUG/KMSAN finding in xfrm_state_find(), and the bad value is consumed in core XFRM state lookup/acquire paths that can be triggered repeatedly. Kernel warning/oops/panic conditions are high availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"4f28141786e1fe884ce42a5197ba9beed540f0ea\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"6535867673bf301d52aa00593a4d1d18cc3922fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"eb2ee15290af14c60b45cf2b73f5687d1d077d9b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"719918fc88df6da023dfff370cd965151a5afd7f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"dc0abce055134cb83b0d981d31ceb20dda419787\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"c7221e7bd8fc2ef38a0b27be580d9d202281306b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"3dcd1664ac15eee6a690daec7c4ffc59190406f7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\", \"lessThan\": \"1799d8abeabc68ec05679292aaf6cba93b343c05\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv6/xfrm6_policy.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.252\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.202\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.128\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.75\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/xfrm6_policy.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea\"}, {\"url\": \"https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa\"}, {\"url\": \"https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b\"}, {\"url\": \"https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f\"}, {\"url\": \"https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787\"}, {\"url\": \"https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b\"}, {\"url\": \"https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7\"}, {\"url\": \"https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm6: fix uninitialized saddr in xfrm6_get_saddr()\\n\\nxfrm6_get_saddr() does not check the return value of\\nipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable\\nsource address (returns -EADDRNOTAVAIL), saddr-\u003ein6 is left\\nuninitialized, but xfrm6_get_saddr() still returns 0 (success).\\n\\nThis causes the caller xfrm_tmpl_resolve_one() to use the uninitialized\\naddress in xfrm_state_find(), triggering KMSAN warning:\\n\\n=====================================================\\nBUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940\\n xfrm_state_find+0x2424/0xa940\\n xfrm_resolve_and_create_bundle+0x906/0x5a20\\n xfrm_lookup_with_ifid+0xcc0/0x3770\\n xfrm_lookup_route+0x63/0x2b0\\n ip_route_output_flow+0x1ce/0x270\\n udp_sendmsg+0x2ce1/0x3400\\n inet_sendmsg+0x1ef/0x2a0\\n __sock_sendmsg+0x278/0x3d0\\n __sys_sendto+0x593/0x720\\n __x64_sys_sendto+0x130/0x200\\n x64_sys_call+0x332b/0x3e70\\n do_syscall_64+0xd3/0xf80\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nLocal variable tmp.i.i created at:\\n xfrm_resolve_and_create_bundle+0x3e3/0x5a20\\n xfrm_lookup_with_ifid+0xcc0/0x3770\\n=====================================================\\n\\nFix by checking the return value of ipv6_dev_get_saddr() and propagating\\nthe error.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.252\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.202\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.165\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.128\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.75\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.16\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.6\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"2.6.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:26:11.398Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43139\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:16:22.034Z\", \"dateReserved\": \"2026-05-01T14:12:55.988Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-06T11:27:24.898Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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