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Vulnerability record · CVE-2026-53046 · published 24 June 2026

CVE-2026-53046: Linux kernel use after free vulnerability

Linux · Linux Kernel

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).

9.8 CVSS 3.1 Critical EPSS 0.72% · top 48.1% CWE-416 · Use after free
9.8CVSS 3.1 base score
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
21 Jul 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-53046), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.