HIGH 7.8 Microsoft PoC
CVE-2021-33909
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations leading to an integer overflow an Out-of-bounds Write and escalation to root by an unprivileged user aka CID-8cae8cd89f05.
Microsoft Security Update 2021-Jul: fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations leading to an integer overflow an Out-of-bounds Write and escalation to root by an unprivileged user aka CID-8cae8cd89f05.
Affected Products
- cm1 kernel 5.10.60.1-1 on CBL Mariner 1.0
- cbl2 kernel 5.10.78.1-1 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33909
- https://nvd.nist.gov/vuln/detail/CVE-2021-33909
This high severity vulnerability with a CVSS score of 7.8 was published on 2021-07-13 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 9.7% (top 5% of all CVEs by exploitation probability). Affected: cm1 kernel 5.10.60.1-1 on CBL Mariner 1.0, cbl2 kernel 5.10.78.1-1 on CBL Mariner 2.0.
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