Vulnerability Description
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).
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.15, < 5.15.209 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/3e298897f41c61450c2e7a4f457e8b2485eb35b3Patch
- https://git.kernel.org/stable/c/57b47231055b431ed0a1a55f33cac32981564405Patch
- https://git.kernel.org/stable/c/7164b3953cefd540e7ebca828c793bc6869cfbc4Patch
- https://git.kernel.org/stable/c/8ef183216feaa24b66b940510d8b68f680eb56e9Patch
- https://git.kernel.org/stable/c/8fcefe840fa8c14ce667768e5b043286ac3bbcbePatch
- https://git.kernel.org/stable/c/b46aa129fa2807bfe1545fe74d9295d53c51520bPatch
- https://git.kernel.org/stable/c/cc2da381875d4a67026e4c8feb3dba51a2a2d1bcPatch
FAQ
What is CVE-2026-53046?
CVE-2026-53046 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 AEA...
How severe is CVE-2026-53046?
CVE-2026-53046 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-53046?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.