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CVE-2026-80843

Unknown

Last modified

CVE-2026-80843 is a vulnerability of currently unknown severity. 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().

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4447bb33f09444920a8f1d89e1540137429351b6, < 958ae9f261319e1cdc44879886bcda2263258cca; >= 4447bb33f09444920a8f1d89e1540137429351b6, < fb7f3e74789a3c89647f4eb768f6dfaf4a751e72; >= 4447bb33f09444920a8f1d89e1540137429351b6, < ba0c110c205855b3f1e3130d8c0fdb484d704c8c; >= 4447bb33f09444920a8f1d89e1540137429351b6, < c8837bbe792257af547fd1c0252553ce13148795; >= 4447bb33f09444920a8f1d89e1540137429351b6, < 71d42da01740ec6557837bebec0bc48cfc3b4c39; >= 4447bb33f09444920a8f1d89e1540137429351b6, < cf67361e78dca488d6e4df8396a53e6745a3a80e; >= 4447bb33f09444920a8f1d89e1540137429351b6, < 37426395cb90ef217beec8407a14bd82153793d3; >= 4447bb33f09444920a8f1d89e1540137429351b6, < be19d20e53a239572bb2a28efcc1cd2b069b1ef9; >= 4447bb33f09444920a8f1d89e1540137429351b6, < c12cbf56320fb633484ee0ca1fb7d68d6b64b213
LinuxLinux2.6.33

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80843?
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.
How severe is CVE-2026-80843?
Severity scoring for CVE-2026-80843 is pending analysis.
How do I fix CVE-2026-80843?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST