# CVE-2026-53046: ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine

CVE-2026-53046 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-53046, released June 25, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-53046
- Priority: High
- CVSS: 9.8 (Moderate)
- EPSS: 0.0072
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53046

## 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.176-1 | [DEBIAN-CVE-2026-53046](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53046.md) | Jun 25, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.94-1 | [DEBIAN-CVE-2026-53046](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53046.md) | Jun 25, 2026 |
| Linux | linux Debian 14 | 7.0.10-1 | [DEBIAN-CVE-2026-53046](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53046.md) | Jun 25, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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