{"id":"CVE-2023-53536","summary":"blk-crypto: make blk_crypto_evict_key() more robust","details":"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't 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't* happen; we're 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.","modified":"2026-03-20T12:33:13.165407Z","published":"2025-10-04T15:16:47.304Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53536.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5bb4005fb667c6e2188fa87950f8d5faf2994410"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/701a8220762ff90615dc91d3543f789391b63298"},{"type":"WEB","url":"https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53536.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53536"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1b2628397058ebce7277480960b29c788138de90"},{"fixed":"701a8220762ff90615dc91d3543f789391b63298"},{"fixed":"5bb4005fb667c6e2188fa87950f8d5faf2994410"},{"fixed":"64ef787bb1588475163069c2e62fdd8f6c27b1f6"},{"fixed":"809a5be62e92a444a3c3d7b9f438019d0b322f55"},{"fixed":"5c62852942667c613de0458fc797c5b8c36112b5"},{"fixed":"5c7cb94452901a93e90c2230632e2c12a681bc92"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53536.json"}}],"schema_version":"1.7.5"}