Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: crypto: af-alg - fix NULL pointer dereference in scatterwalk The AF_ALG interface fails to unmark the end of a Scatter/Gather List (SGL) when chaining a new af_alg_tsgl structure. If a sendmsg() fills an SGL exactly to MAX_SGL_ENTS, the last entry is marked as the end. A subsequent sendmsg() allocates a new SGL and chains it, but fails to clear the end marker on the previous SGL's last data entry. This causes the crypto scatterwalk to hit a premature end, returning NULL on sg_next() and leading to a kernel panic during dereference. Fix this by explicitly unmarking the end of the previous SGL when performing sg_chain() in af_alg_alloc_tsgl().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before f48d3dd99199180cf37d6253550c55e86372309a; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before f9acceae7b004956851fd4268edf9f518a9bce04; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 7195350fb78538c25cd790d703f8f2c73ee0d395; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 00cbdec17c15d024a1c5002c7365df7624a18a75; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7; affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 62397b493e14107ae82d8b80938f293d95425bcb |
| Linux / Linux | affected 2.6.38; unaffected 0 before 2.6.38; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.168 through 6.1.*; unaffected 6.6.134 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a
- https://git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04
- https://git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395
- https://git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49
- https://git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948
- https://git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75
- https://git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7
- https://git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb