CVE-2026-53046

Summary

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 Software

Weaknesses

References

• https://git.kernel.org/stable/c/57b47231055b431ed0a1a55f33cac32981564405
• https://git.kernel.org/stable/c/cc2da381875d4a67026e4c8feb3dba51a2a2d1bc
• https://git.kernel.org/stable/c/8fcefe840fa8c14ce667768e5b043286ac3bbcbe
• https://git.kernel.org/stable/c/8ef183216feaa24b66b940510d8b68f680eb56e9
• https://git.kernel.org/stable/c/7164b3953cefd540e7ebca828c793bc6869cfbc4
• https://git.kernel.org/stable/c/b46aa129fa2807bfe1545fe74d9295d53c51520b
• https://git.kernel.org/stable/c/3e298897f41c61450c2e7a4f457e8b2485eb35b3

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