In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - copy IV using skcipher ivsize AF_ALG rfc3686-ctr-aes-ccp requests pass an 8-byte IV to the driver. ccp_aes_complete() restores AES_BLOCK_SIZE bytes into the caller's IV buffer while RFC3686 skciphers expose an 8-byte IV, so the restore overruns the provided buffer. Use crypto_skcipher_ivsize() to copy only the algorithm's IV length.

A flaw was found in the Linux kernel's cryptographic coprocessor (CCP) driver. When processing AF_ALG rfc3686-ctr-aes-ccp requests, the ccp_aes_complete() function attempts to restore more data than the allocated buffer for the Initialization Vector (IV) can hold. This leads to a buffer overrun, which can result in memory corruption within the kernel.

An out-of-bounds write exists in the AMD CCP AES completion path because ccp_aes_complete() restores AES_BLOCK_SIZE bytes into req iv even when the selected skcipher exposes a shorter IV. For RFC3686 CTR AES through AF_ALG, the caller IV can be 8 bytes while the driver copies 16 bytes, overwriting memory past the provided IV buffer. For the CVSS the PR:L is used because a local user or local process can reach AF_ALG crypto interfaces without needing full administrator privileges when the vulnerable CCP backed algorithm is available. The issue is not network reachable and requires local code execution on a system with the affected CCP crypto driver and algorithm available. To mitigate this issue, prevent module ccp-crypto from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Red Hat Enterprise Linux 10 2026-07-14T00:00:00Z RHSA-2026:39494 kernel-0:6.12.0-211.34.1.el10_2 Red Hat Enterprise Linux 9 2026-07-13T00:00:00Z RHSA-2026:38491 kernel-0:5.14.0-687.25.1.el9_8 Red Hat Enterprise Linux 9 2026-07-13T00:00:00Z RHSA-2026:38491 kernel-0:5.14.0-687.25.1.el9_8 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 Affected kernel Red Hat Enterprise Linux 8 Affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53016 https://nvd.nist.gov/vuln/detail/CVE-2026-53016 https://lore.kernel.org/linux-cve-announce/2026062451-CVE-2026-53016-90ac@gregkh/T