Answer in brief
CVE-2026-43107 records a Unknown severity vulnerability in xfrm: account XFRMA_IF_ID in aevent size calculation. 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.
A CVSS score is not reported in the current record. 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 | >=7e6526404adedf079279aa7aa11722deaca8fe2e <f8f3bb89ab677db15f9f5250c77af728f9afe995 || >=7e6526404adedf079279aa7aa11722deaca8fe2e <2c41283d94af943a05f7f2cc1a01f0c872f3cf43 || >=7e6526404adedf079279aa7aa11722deaca8fe2e <e62e322ea20be78e346e4b49f9a6b9f03313af4c || >=7e6526404adedf079279aa7aa11722deaca8fe2e <58e5735d1a5373652f405a0c16e54ac04aaab0ad || >=7e6526404adedf079279aa7aa11722deaca8fe2e <7081d46d32312f1a31f0e0e99c6835a394037599 | f8f3bb89ab677db15f9f5250c77af728f9afe995, 2c41283d94af943a05f7f2cc1a01f0c872f3cf43, e62e322ea20be78e346e4b49f9a6b9f03313af4c, 58e5735d1a5373652f405a0c16e54ac04aaab0ad, 7081d46d32312f1a31f0e0e99c6835a394037599 |
| Linux/Linuxgeneric | 4.19 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 21, 2026
In the Linux kernel, the following vulnerability has been resolved: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is set. xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0) in xfrm_get_ae(), turning a malformed netlink interaction into a kernel panic. Account XFRMA_IF_ID in the size calculation unconditionally and replace the BUG_ON with normal error unwinding.
Quoted source text, attributed separately from HOL analysis.