{"id":"CVE-2026-89783","revision":"b3a91bdfdc97443498daa791f02ed475","records":[{"revision":"b3a91bdfdc97443498daa791f02ed475","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89783","aliases":[],"title":"xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full\n\nThe depth check in xfrm6_input_addr() is off by one:\n\n  if (1 + sp->len == XFRM_MAX_DEPTH)\n          goto drop;\n  ...\n  sp->xvec[sp->len++] = x;\n\nxfrm_input() can leave sp->len == XFRM_MAX_DEPTH, and the transport-mode\nreceive path re-enters IPv6 input via xfrm_trans_reinject() with that\nsecpath preserved. If the inner packet carries a destination-options HAO\noption or a type-2 routing header, xfrm6_input_addr() is called with\nsp->len == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so\nsp->xvec[sp->len++] writes one slot past the 6-element xvec[]. The write\nstays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS\nflags it and panics under panic_on_warn.\n\nUse \"sp->len >= XFRM_MAX_DEPTH\", matching xfrm_input(). This also\nrestores one chain level the old check rejected at sp->len == 5.\n\n  UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10\n  index 6 is out of range for type 'xfrm_state *[6]'","state":0,"publishedAt":"2026-09-16T08:48:21.761+00:00","modifiedAt":"2026-10-19T08:52:35.697+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_input.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"91fc387f63c00ddfb5221127a17bac97549a8343\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"68e8737fe8e72f085c608cff322b3d2de8340af1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"bdcda866c89f9a8b1acdabf02d26cde9fbe501d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"48996649222e95008cdb98cd58579e3fc8e5ee06\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"0f679e0523ddfff3fb554336ceb874b0e51e9cd3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"5f35a29a5eed3d80befd32050843ac88dea3d61a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\n                            \"lessThan\": \"5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc\",\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_input.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.25\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.25\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\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:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343","https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1","https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77","https://git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8","https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06","https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3","https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a","https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89783","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89783","identifiers":["CVE-2026-89783"]},"retained":false,"historicalAffected":[]}],"coverage":[]}