FKIE_CVE-2023-53536

Vulnerability from fkie_nvd - Published: 2025-10-04 16:15 - Updated: 2026-02-09 22:06
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bb4005fb667c6e2188fa87950f8d5faf2994410Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/701a8220762ff90615dc91d3543f789391b63298Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-crypto: make blk_crypto_evict_key() more robust\n\nIf blk_crypto_evict_key() sees that the key is still in-use (due to a\nbug) or that -\u003ekeyslot_evict failed, it currently just returns while\nleaving the key linked into the keyslot management structures.\n\nHowever, blk_crypto_evict_key() is only called in contexts such as inode\neviction where failure is not an option.  So actually the caller\nproceeds with freeing the blk_crypto_key regardless of the return value\nof blk_crypto_evict_key().\n\nThese two assumptions don\u0027t match, and the result is that there can be a\nuse-after-free in blk_crypto_reprogram_all_keys() after one of these\nerrors occurs.  (Note, these errors *shouldn\u0027t* happen; we\u0027re just\ntalking about what happens if they do anyway.)\n\nFix this by making blk_crypto_evict_key() unlink the key from the\nkeyslot management structures even on failure.\n\nAlso improve some comments."
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