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Vulnerability record · CVE-2023-53536 · published 4 October 2025

CVE-2023-53536: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: blk-crypto: make blk_crypto_evict_key() more robust If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures. However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key(). These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.) Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure. Also improve some comments.

7.8 CVSS 3.1 High EPSS 0.16% · top 95.6% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
4 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: blk-crypto: make blk_crypto_evict_key() more robust If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures. However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key(). These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.) Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure. Also improve some comments.

CVSS:3.1/AV:L/AC:L/PR:L/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/5bb4005fb667c6e2188fa87950f8d5faf2994410 Patch
https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5 Patch
https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92 Patch
https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6 Patch
https://git.kernel.org/stable/c/701a8220762ff90615dc91d3543f789391b63298 Patch
https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55 Patch

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Source: NIST National Vulnerability Database (record CVE-2023-53536), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.