CVE-2026-53016: crypto: ccp - copy IV using skcipher ivsize

CVE-2026-53016: crypto: ccp - copy IV using skcipher ivsize

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2026-53016 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 5.10.258 with commit 939061b2d0f7f15114e34b4ce878ef50ff4089c3
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 5.15.209 with commit 798d409a8949f3f495f238549b86de2886b129bd
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 6.1.175 with commit dfb2cf434829819268fe50f41542aad318ad62b2
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 6.6.141 with commit eecee15e263ccb8cd77170a56ab6c969cb54dd6a
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 6.12.91 with commit bb01d8f1f385bc9034ca114d3508c7fdea24fc9a
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 6.18.33 with commit df9784bb5b637ac80f4a2768a58ca9a50bef28a9
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 7.0.10 with commit 227c1e1d9e2aa4cfc65ba446d5690da1f546cda4
	Issue introduced in 3.14 with commit 2b789435d7f36ed918d92db647f3a2f3fec9bb1f and fixed in 7.1 with commit a7a1f3cdd64d8a165d9b8c9e9ad7fb46ac19dfc4

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-53016
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/crypto/ccp/ccp-crypto-aes.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/939061b2d0f7f15114e34b4ce878ef50ff4089c3
	https://git.kernel.org/stable/c/798d409a8949f3f495f238549b86de2886b129bd
	https://git.kernel.org/stable/c/dfb2cf434829819268fe50f41542aad318ad62b2
	https://git.kernel.org/stable/c/eecee15e263ccb8cd77170a56ab6c969cb54dd6a
	https://git.kernel.org/stable/c/bb01d8f1f385bc9034ca114d3508c7fdea24fc9a
	https://git.kernel.org/stable/c/df9784bb5b637ac80f4a2768a58ca9a50bef28a9
	https://git.kernel.org/stable/c/227c1e1d9e2aa4cfc65ba446d5690da1f546cda4
	https://git.kernel.org/stable/c/a7a1f3cdd64d8a165d9b8c9e9ad7fb46ac19dfc4