Answer in brief
CVE-2026-80843 records a Unknown severity vulnerability in xfrm: fix xfrm_state_construct() auth-trunc leak. 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 | >=4447bb33f09444920a8f1d89e1540137429351b6 <958ae9f261319e1cdc44879886bcda2263258cca || >=4447bb33f09444920a8f1d89e1540137429351b6 <fb7f3e74789a3c89647f4eb768f6dfaf4a751e72 || >=4447bb33f09444920a8f1d89e1540137429351b6 <ba0c110c205855b3f1e3130d8c0fdb484d704c8c || >=4447bb33f09444920a8f1d89e1540137429351b6 <c8837bbe792257af547fd1c0252553ce13148795 || >=4447bb33f09444920a8f1d89e1540137429351b6 <71d42da01740ec6557837bebec0bc48cfc3b4c39 || >=4447bb33f09444920a8f1d89e1540137429351b6 <cf67361e78dca488d6e4df8396a53e6745a3a80e || >=4447bb33f09444920a8f1d89e1540137429351b6 <37426395cb90ef217beec8407a14bd82153793d3 || >=4447bb33f09444920a8f1d89e1540137429351b6 <be19d20e53a239572bb2a28efcc1cd2b069b1ef9 || >=4447bb33f09444920a8f1d89e1540137429351b6 <c12cbf56320fb633484ee0ca1fb7d68d6b64b213 | 958ae9f261319e1cdc44879886bcda2263258cca, fb7f3e74789a3c89647f4eb768f6dfaf4a751e72, ba0c110c205855b3f1e3130d8c0fdb484d704c8c, c8837bbe792257af547fd1c0252553ce13148795, 71d42da01740ec6557837bebec0bc48cfc3b4c39, cf67361e78dca488d6e4df8396a53e6745a3a80e, 37426395cb90ef217beec8407a14bd82153793d3, be19d20e53a239572bb2a28efcc1cd2b069b1ef9, c12cbf56320fb633484ee0ca1fb7d68d6b64b213 |
| Linux/Linuxgeneric | 2.6.33 | Not reported |
Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 4, 2026
In the Linux kernel, the following vulnerability has been resolved: xfrm: fix xfrm_state_construct() auth-trunc leak attach_auth_trunc() can allocate x->aalg while leaving x->props.aalgo at zero when the selected auth algorithm has no sadb_alg_id. One real case is cmac(aes). xfrm_state_construct() then treats !x->props.aalgo as "no auth algorithm attached yet" and calls attach_auth(). That overwrites x->aalg and loses the first allocation. Any later failure or teardown only frees the replacement pointer. Check whether x->aalg is already attached instead of inferring that state from x->props.aalgo.
Quoted source text, attributed separately from HOL analysis.