In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - restore callback for non-parallel fallback pcrypt installs pcrypt_aead_done() on the child AEAD request before trying to submit it through padata. If padata_do_parallel() returns -EBUSY, pcrypt falls back to calling the child AEAD directly. That fallback must not keep the padata completion callback. Otherwise an asynchronous completion runs pcrypt_aead_done() even though the request was never enrolled in padata. Restore the original request callback and callback data before calling the child AEAD directly. This keeps the fallback path aligned with a direct AEAD request while leaving the parallel path unchanged.

A flaw was found in the Linux kernel's parallel cryptography (pcrypt) subsystem. When the system falls back to a non-parallel processing path, it fails to properly restore the original callback function and data. This oversight can lead to an asynchronous completion running an incorrect callback, potentially causing unexpected system behavior or resource management issues. This vulnerability could be exploited by a local attacker to disrupt system operations.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-64312 https://nvd.nist.gov/vuln/detail/CVE-2026-64312 https://lore.kernel.org/linux-cve-announce/2026072509-CVE-2026-64312-2566@gregkh/T