CVE-2026-31694 Affecting linux-qemu-rc package, versions <7.1_rc3-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.01% (4th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LINUXQEMURC-16727252
  • published17 May 2026
  • disclosed1 May 2026

Introduced: 1 May 2026

CVE-2026-31694  (opens in a new tab)

How to fix?

Upgrade Chainguard linux-qemu-rc to version 7.1_rc3-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-qemu-rc package and not the linux-qemu-rc package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

fuse: reject oversized dirents in page cache

fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent into a single page-cache page. The existing logic only checks whether the dirent fits in the remaining space of the current page and advances to a fresh page if not. It never checks whether the dirent itself exceeds PAGE_SIZE.

As a result, a malicious FUSE server can return a dirent with namelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB page systems this causes memcpy() to overflow the cache page by 24 bytes into the following kernel page.

Reject dirents that cannot fit in a single page before copying them into the readdir cache.

CVSS Base Scores

version 3.1