CVE-2026-53046: In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine ksmbd_crypt_message()…

PriorityP351critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.53%

41.1th percentile

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine ksmbd_crypt_message() sets a NULL completion callback on AEAD requests and does not handle the -EINPROGRESS return code from async hardware crypto engines like the Qualcomm Crypto Engine (QCE). When QCE returns -EINPROGRESS, ksmbd treats it as an error and immediately frees the request while the hardware DMA operation is still in flight. The DMA completion callback then dereferences freed memory, causing a NULL pointer crash: pc : qce_skcipher_done+0x24/0x174 lr : vchan_complete+0x230/0x27c ... el1h_64_irq+0x68/0x6c ksmbd_free_work_struct+0x20/0x118 [ksmbd] ksmbd_exit_file_cache+0x694/0xa4c [ksmbd] Use the standard crypto_wait_req() pattern with crypto_req_done() as the completion callback, matching the approach used by the SMB client in fs/smb/client/smb2ops.c. This properly handles both synchronous engines (immediate return) and async engines (-EINPROGRESS followed by callback notification).

Affected

8 ranges

Vendor	Product	Version range	Fixed in
linux	linux	—	—
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 57b47231055b431ed0a1a55f33cac32981564405	57b47231055b431ed0a1a55f33cac32981564405
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < cc2da381875d4a67026e4c8feb3dba51a2a2d1bc	cc2da381875d4a67026e4c8feb3dba51a2a2d1bc
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 8fcefe840fa8c14ce667768e5b043286ac3bbcbe	8fcefe840fa8c14ce667768e5b043286ac3bbcbe
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 8ef183216feaa24b66b940510d8b68f680eb56e9	8ef183216feaa24b66b940510d8b68f680eb56e9
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 7164b3953cefd540e7ebca828c793bc6869cfbc4	7164b3953cefd540e7ebca828c793bc6869cfbc4
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b46aa129fa2807bfe1545fe74d9295d53c51520b	b46aa129fa2807bfe1545fe74d9295d53c51520b
linux	linux	>= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 3e298897f41c61450c2e7a4f457e8b2485eb35b3	3e298897f41c61450c2e7a4f457e8b2485eb35b3

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