xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89783
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 09:17:08 UTC
Updated2026-09-16 15:18:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full The depth check in xfrm6_input_addr() is off by one: if (1 + sp->len == XFRM_MAX_DEPTH) goto drop; ... sp->xvec[sp->len++] = x; xfrm_input() can leave sp->len == XFRM_MAX_DEPTH, and the transport-mode receive path re-enters IPv6 input via xfrm_trans_reinject() with that secpath preserved. If the inner packet carries a destination-options HAO option or a type-2 routing header, xfrm6_input_addr() is called with sp->len == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so sp->xvec[sp->len++] writes one slot past the 6-element xvec[]. The write stays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS flags it and panics under panic_on_warn. Use "sp->len >= XFRM_MAX_DEPTH", matching xfrm_input(). This also restores one chain level the old check rejected at sp->len == 5. UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10 index 6 is out of range for type 'xfrm_state *[6]'

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002100000 probability, percentile 0.114450000 (date 2026-09-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 91fc387f63c00ddfb5221127a17bac97549a8343 git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 68e8737fe8e72f085c608cff322b3d2de8340af1 git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77 git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 bdcda866c89f9a8b1acdabf02d26cde9fbe501d8 git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 48996649222e95008cdb98cd58579e3fc8e5ee06 git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 0f679e0523ddfff3fb554336ceb874b0e51e9cd3 git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 5f35a29a5eed3d80befd32050843ac88dea3d61a git Not specified
CNA Linux Linux affected 9473e1f631de339c50bde1e3bd09e1045fe90fd5 5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc git Not specified
CNA Linux Linux affected 2.6.25 Not specified
CNA Linux Linux unaffected 2.6.25 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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