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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3
https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39
https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca
https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c
https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9
https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213
https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795
https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e
https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-04 16:18

Updated : 2026-09-04 16:18

NVD link : CVE-2026-80843

Mitre link : CVE-2026-80843

CVE.ORG link : CVE-2026-80843

JSON object : View

Products Affected

No product.

CWE

No CWE.

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One real case is cmac(aes).\n\nxfrm_state_construct() then treats !x->props.aalgo as \"no auth\nalgorithm attached yet\" and calls attach_auth(). That overwrites\nx->aalg and loses the first allocation. Any later failure or teardown\nonly frees the replacement pointer.\n\nCheck whether x->aalg is already attached instead of inferring that\nstate from x->props.aalgo."}], "lastModified": "2026-09-04T16:18:12.877", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}