Answer in brief
CVE-2026-89783 records a Critical severity (CVSS 9.8) vulnerability in xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <91fc387f63c00ddfb5221127a17bac97549a8343 || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <68e8737fe8e72f085c608cff322b3d2de8340af1 || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77 || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <bdcda866c89f9a8b1acdabf02d26cde9fbe501d8 || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <48996649222e95008cdb98cd58579e3fc8e5ee06 || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <0f679e0523ddfff3fb554336ceb874b0e51e9cd3 || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <5f35a29a5eed3d80befd32050843ac88dea3d61a || >=9473e1f631de339c50bde1e3bd09e1045fe90fd5 <5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc | 91fc387f63c00ddfb5221127a17bac97549a8343, 68e8737fe8e72f085c608cff322b3d2de8340af1, 8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77, bdcda866c89f9a8b1acdabf02d26cde9fbe501d8, 48996649222e95008cdb98cd58579e3fc8e5ee06, 0f679e0523ddfff3fb554336ceb874b0e51e9cd3, 5f35a29a5eed3d80befd32050843ac88dea3d61a, 5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc |
| Linux/Linuxgeneric | 2.6.25 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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]'
Quoted source text, attributed separately from HOL analysis.