{"id":"CVE-2026-89783","title":"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  …","summary":"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  …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 91fc387f63c00ddfb5221127a17bac97549a8343","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 68e8737fe8e72f085c608cff322b3d2de8340af1","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < bdcda866c89f9a8b1acdabf02d26cde9fbe501d8","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 48996649222e95008cdb98cd58579e3fc8e5ee06","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 0f679e0523ddfff3fb554336ceb874b0e51e9cd3","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 5f35a29a5eed3d80befd32050843ac88dea3d61a","Linux >= 9473e1f631de339c50bde1e3bd09e1045fe90fd5 < 5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc","Linux 2.6.25"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:08.720","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89783","references":[{"url":"https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T08:52:29.592Z","epss":0.00704,"epssPercentile":0.51874,"slug":"CVE-2026-89783","body":"## Overview\n\nIn 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]'\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205269,"id":"CVE-2026-89783","ts":1789570706024,"field":"cvss","old":null,"new":"9.8"},{"seq":205268,"id":"CVE-2026-89783","ts":1789570706024,"field":"severity","old":"none","new":"critical"}]}