Out-of-bounds write in Linux kernel - CVE-2023-31436
Published: May 14, 2023 / Updated: June 16, 2024
Vulnerability identifier: #VU76098
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-31436
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the qfq_change_class() function in net/sched/sch_qfq.c when handling the MTU value provided to the QFQ Scheduler. A local user can trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
How to mitigate CVE-2023-31436
Install updates from vendor's website.
Sources
- https://github.com/torvalds/linux/commit/3037933448f60f9acb705997eae62013ecb81e0d
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.13
- https://www.spinics.net/lists/stable-commits/msg294885.html
- https://www.debian.org/security/2023/dsa-5402
- https://www.zerodayinitiative.com/advisories/ZDI-24-593/