{"id":"CVE-2026-43139","revision":"6b08aca192204ed08de186e48d2b5f22","records":[{"revision":"6b08aca192204ed08de186e48d2b5f22","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43139","aliases":[],"title":"xfrm6: fix uninitialized saddr in xfrm6_get_saddr()","description":"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->in6 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.","state":0,"publishedAt":"2026-05-06T11:27:24.898+00:00","modifiedAt":"2026-10-19T19:16:22.034+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/xfrm6_policy.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"4f28141786e1fe884ce42a5197ba9beed540f0ea\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"6535867673bf301d52aa00593a4d1d18cc3922fa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"eb2ee15290af14c60b45cf2b73f5687d1d077d9b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"719918fc88df6da023dfff370cd965151a5afd7f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"dc0abce055134cb83b0d981d31ceb20dda419787\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"c7221e7bd8fc2ef38a0b27be580d9d202281306b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"3dcd1664ac15eee6a690daec7c4ffc59190406f7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a1e59abf824969554b90facd44a4ab16e265afa4\",\n                            \"lessThan\": \"1799d8abeabc68ec05679292aaf6cba93b343c05\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/xfrm6_policy.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.252\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.202\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.165\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.128\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.16\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.6\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","score":8.6,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea","https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa","https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b","https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f","https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787","https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b","https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7","https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43139","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43139","identifiers":["CVE-2026-43139"]},"retained":false,"historicalAffected":[]}],"coverage":[]}