CVE-2026-89783

CVE CVE-2026-89783EUVD EUVD-2026-80304Published 2026-09-16T08:48:21.000ZLast changed 2026-09-16T14:38:34.000ZCVSS 9.8

What the advisory describes

In 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]'

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 5.10.270; patch: 6.1.188; patch: 6.18.52; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <5f35a29a5eed3d80befd32050843ac88dea3d61a; patch: 5.15.221; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <91fc387f63c00ddfb5221127a17bac97549a8343; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <48996649222e95008cdb98cd58579e3fc8e5ee06; 2.6.25; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <bdcda866c89f9a8b1acdabf02d26cde9fbe501d8; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <68e8737fe8e72f085c608cff322b3d2de8340af1; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <0f679e0523ddfff3fb554336ceb874b0e51e9cd3; patch: 6.6.157; patch: 6.12.110; 9473e1f631de339c50bde1e3bd09e1045fe90fd5 <5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc; patch: 7.3-rc1; patch: 0; patch: 7.2.6

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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