# CVE-2026-23044: linux: In the Linux kernel, the following vulnerability has been resolved:  PM: hibernate: Fix crash when freeing invalid cr...

CVE-2026-23044 is fixed in linux on 1 platform by DEBIAN-CVE-2026-23044 (version 6.18.8-1), released February 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-23044
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 4, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  PM: hibernate: Fix crash when freeing invalid crypto compressor  When crypto_alloc_acomp() fails, it returns an ERR_PTR value, not NULL.  The cleanup code in save_compressed_image() and load_compressed_image() unconditionally calls crypto_free_acomp() without checking for ERR_PTR, which causes crypto_acomp_tfm() to dereference an invalid pointer and crash the kernel.  This can be triggered when the compression algorithm is unavailable (e.g., CONFIG_CRYPTO_LZO not enabled).  Fix by adding IS_ERR_OR_NULL() checks before calling crypto_free_acomp() and acomp_request_free(), similar to the existing kthread_stop() check.  [ rjw: Added 2 empty code lines ]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.18.8-1 | [DEBIAN-CVE-2026-23044](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23044.md) | Feb 4, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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