Observable discrepancy in Linux kernel - CVE-2026-31483
Published: April 24, 2026
Vulnerability identifier: #VU127665
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31483
CWE-ID: CWE-203
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 disclose sensitive information.
The vulnerability exists due to improper restriction of speculative execution in syscall dispatch table handling when processing a user-controlled syscall number. A local user can supply a crafted syscall number to disclose sensitive information.
How to mitigate CVE-2026-31483
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1cb9c7bc9025c637564fabc7fcc3c9343949e310
- https://git.kernel.org/stable/c/3c3b97064764899c39a0abbd35a6caa031e70333
- https://git.kernel.org/stable/c/48b8814e25d073dd84daf990a879a820bad2bcbd
- https://git.kernel.org/stable/c/4d05dd18d867d58c6952a3bc260d244899da7256
- https://git.kernel.org/stable/c/7a5260fbc6e79a1595328ec5c6aa3f937504a1f0
- https://git.kernel.org/stable/c/87776f02449e3bded95b2ccbd6b012e9ae64e6f3
- https://git.kernel.org/stable/c/f8c444b918d639e1f9a621ee20fe481c1d10dfc4