What’s Vulnerable › Vulnerabilities
CVE-2024-36931: s390/cio: Ensure the copied buf is NUL terminated
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-05-30 · updated 2026-06-17
- Weakness: CWE-125
Description
In the Linux kernel, the following vulnerability has been resolved: s390/cio: Ensure the copied buf is NUL terminated Currently, we allocate a lbuf-sized kernel buffer and copy lbuf from userspace to that buffer. Later, we use scanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using scanf. Fix this issue by using memdup_user_nul instead.
Affected products
- Linux kernel: from 5.13 before 5.15.159; from 5.16 before 6.1.91; from 6.2 before 6.6.31; from 6.7 before 6.8.10; 6.9-rc1, 6.9-rc2, 6.9-rc3, 6.9-rc4, 6.9-rc5, 6.9-rc6 — fixed in 5.15.159, 6.1.91, 6.6.31, 6.8.10
How to fix
Upgrade to a fixed version: Linux kernel 5.15.159, 6.1.91, 6.6.31, 6.8.10. Check the vendor advisory for mitigations.
References
- https://git.kernel.org/stable/c/06759ebaf75c19c87b2453a5e130e9e61e9b5d65
- https://git.kernel.org/stable/c/10452edd175fcc4fd0f5ac782ed2a002e3e5d65c
- https://git.kernel.org/stable/c/84b38f48836662c4bfae646c014f4e981e16a2b2
- https://git.kernel.org/stable/c/c9d48ce163305595ae20aee27774192476d5e6a5
- https://git.kernel.org/stable/c/da7c622cddd4fe36be69ca61e8c42e43cde94784
- https://git.kernel.org/stable/c/06759ebaf75c19c87b2453a5e130e9e61e9b5d65
- https://git.kernel.org/stable/c/10452edd175fcc4fd0f5ac782ed2a002e3e5d65c
- https://git.kernel.org/stable/c/84b38f48836662c4bfae646c014f4e981e16a2b2
- https://git.kernel.org/stable/c/c9d48ce163305595ae20aee27774192476d5e6a5
- https://git.kernel.org/stable/c/da7c622cddd4fe36be69ca61e8c42e43cde94784
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