crypto: af-alg - fix NULL pointer dereference in scatterwalk
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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().
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.38
References 8
git.kernel.org
- stable/c/f48d3dd99199180cf37d6253550c55e86372309a
- stable/c/f9acceae7b004956851fd4268edf9f518a9bce04
- stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395
- stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49
- stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948
- stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75
- stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7
- stable/c/62397b493e14107ae82d8b80938f293d95425bcb