Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free in crypt_message when using async crypto The CVE-2024-50047 fix removed asynchronous crypto handling from crypt_message(), assuming all crypto operations are synchronous. However, when hardware crypto accelerators are used, this can cause use-after-free crashes: crypt_message() // Allocate the creq buffer containing the req creq = smb2_get_aead_req(..., &req); // Async encryption returns -EINPROGRESS immediately rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); // Free creq while async operation is still in progress kvfree_sensitive(creq, ...); Hardware crypto modules often implement async AEAD operations for performance. When crypto_aead_encrypt/decrypt() returns -EINPROGRESS, the operation completes asynchronously. Without crypto_wait_req(), the function immediately frees the request buffer, leading to crashes when the driver later accesses the freed memory. This results in a use-after-free condition when the hardware crypto driver later accesses the freed request structure, leading to kernel crashes with NULL pointer dereferences. The issue occurs because crypto_alloc_aead() with mask=0 doesn't guarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in the mask, async implementations can be selected. Fix by restoring the async crypto handling: - DECLARE_CRYPTO_WAIT(wait) for completion tracking - aead_request_set_callback() for async completion notification - crypto_wait_req() to wait for operation completion This ensures the request buffer isn't freed until the crypto operation completes, whether synchronous or asynchronous, while preserving the CVE-2024-50047 fix.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8f14a476abba13144df5434871a7225fd29af633 before 5d047b12f86cc3b9fde1171c02d9bccf4dba0632; affected ef51c0d544b1518b35364480317ab6d3468f205d before 6550b2bef095d0dd2d2c8390d2ea4c3837028833; affected bce966530fd5542bbb422cb45ecb775f7a1a6bc3 before 9a1d3e8d40f151c2d5a5f40c410e6e433f62f438; affected 0809fb86ad13b29e1d6d491364fc7ea4fb545995 before 15a0a5de49507062bc3be4014a403d8cea5533de; affected b0abcd65ec545701b8793e12bc27dc98042b151a before 2a76bc2b24ed889a689fb1c9015307bf16aafb5b; affected b0abcd65ec545701b8793e12bc27dc98042b151a before 8ac90f6824fc44d2e55a82503ddfc95defb19ae0; affected b0abcd65ec545701b8793e12bc27dc98042b151a before b220bed63330c0e1733dc06ea8e75d5b9962b6b6; affected 538c26d9bf70c90edc460d18c81008a4e555925a; affected 5.10.237 before 5.10.241; affected 5.15.181 before 5.15.190; affected 6.1.128 before 6.1.147; affected 6.6.57 before 6.6.100; affected 6.11.4 before 6.12 |
| Linux / Linux | affected 6.12; unaffected 0 before 6.12; unaffected 5.10.241 through 5.10.*; unaffected 5.15.190 through 5.15.*; unaffected 6.1.147 through 6.1.*; unaffected 6.6.100 through 6.6.*; unaffected 6.12.40 through 6.12.*; unaffected 6.15.8 through 6.15.*; unaffected 6.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5d047b12f86cc3b9fde1171c02d9bccf4dba0632
- https://git.kernel.org/stable/c/6550b2bef095d0dd2d2c8390d2ea4c3837028833
- https://git.kernel.org/stable/c/9a1d3e8d40f151c2d5a5f40c410e6e433f62f438
- https://git.kernel.org/stable/c/15a0a5de49507062bc3be4014a403d8cea5533de
- https://git.kernel.org/stable/c/2a76bc2b24ed889a689fb1c9015307bf16aafb5b
- https://git.kernel.org/stable/c/8ac90f6824fc44d2e55a82503ddfc95defb19ae0
- https://git.kernel.org/stable/c/b220bed63330c0e1733dc06ea8e75d5b9962b6b6
ADP enrichment
No English description supplied.