Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1b2628397058ebce7277480960b29c788138de90 before 701a8220762ff90615dc91d3543f789391b63298; affected 1b2628397058ebce7277480960b29c788138de90 before 5bb4005fb667c6e2188fa87950f8d5faf2994410; affected 1b2628397058ebce7277480960b29c788138de90 before 64ef787bb1588475163069c2e62fdd8f6c27b1f6; affected 1b2628397058ebce7277480960b29c788138de90 before 809a5be62e92a444a3c3d7b9f438019d0b322f55; affected 1b2628397058ebce7277480960b29c788138de90 before 5c62852942667c613de0458fc797c5b8c36112b5; affected 1b2628397058ebce7277480960b29c788138de90 before 5c7cb94452901a93e90c2230632e2c12a681bc92 |
| Linux / Linux | affected 5.8; unaffected 0 before 5.8; unaffected 5.10.180 through 5.10.*; unaffected 5.15.111 through 5.15.*; unaffected 6.1.28 through 6.1.*; unaffected 6.2.15 through 6.2.*; unaffected 6.3.2 through 6.3.*; unaffected 6.4 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/701a8220762ff90615dc91d3543f789391b63298
- https://git.kernel.org/stable/c/5bb4005fb667c6e2188fa87950f8d5faf2994410
- https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6
- https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55
- https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5
- https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92