CVE-2026-31781

Description

In the Linux kernel, the following vulnerability has been resolved: drm/ioc32: stop speculation on the drm_compat_ioctl path The drm compat ioctl path takes a user controlled pointer, and then dereferences it into a table of function pointers, the signature method of spectre problems. Fix this up by calling array_index_nospec() on the index to the function pointer list.

CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.16.63 — 3.17
linux	linux_kernel	4.4.170 — 4.5
linux	linux_kernel	4.9.148 — 4.10
linux	linux_kernel	4.14.91 — 4.15
linux	linux_kernel	4.19.13 — 4.20
linux	linux_kernel	4.20.1 — 5.10.253
linux	linux_kernel	5.11 — 5.15.203
linux	linux_kernel	5.16 — 6.1.168
linux	linux_kernel	6.2 — 6.6.134
linux	linux_kernel	6.7 — 6.12.81
linux	linux_kernel	6.13 — 6.18.22
linux	linux_kernel	6.19 — 6.19.12
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/27ef84bba9b9d7b03418c60fbc6069ea0e87b13c https://git.kernel.org/stable/c/46a60ee8956ef1975f00455f614761c7ecedc09d https://git.kernel.org/stable/c/489f2ef2b908898d01df697dc4fe1476674be640 https://git.kernel.org/stable/c/4a41c2b18fc05d30b718d2602cac339eae710b34 https://git.kernel.org/stable/c/5bb398991f378ef74d90b14a6ea8b61ff96cc03a https://git.kernel.org/stable/c/d59c5d8539662d95887b4564f3f72ad38076a2d5 https://git.kernel.org/stable/c/f0e441be08a2eab10b2d06fccfa267ee599dd6b3 https://git.kernel.org/stable/c/f8995c2df519f382525ca4bc90553ad2ec611067

Frequently Asked Questions

What is CVE-2026-31781? +

In the Linux kernel, the following vulnerability has been resolved: drm/ioc32: stop speculation on the drm_compat_ioctl path The drm compat ioctl path takes a user controlled pointer, and then dereferences it into a table of function pointers, the signature method of spectre problems. Fix this up by calling array_index_nospec() on the index to the function pointer list. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31781? +

CVE-2026-31781 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-31781? +

CVE-2026-31781 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-31781? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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