CVE-2026-31694
7.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cac...
Published: 2026-05-01 · Last updated: 2026-06-01
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
Description
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-31694
- [Other]https://git.kernel.org/stable/c/038e61812fa52ef62bad2cfc96bf37dc0db47c1e
- [Other]https://git.kernel.org/stable/c/1d4a517fa90480c52fd452fea2686cd80f773ce2
- [Other]https://git.kernel.org/stable/c/3059f9abe7f1ba8fddf3c86c5faa1eeacf07e7d4
- [Patch]https://git.kernel.org/stable/c/45c05af36311624c1148123caeb011312495d86b
- [Patch]https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5
- [Patch]https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed
- [Patch]https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f
- [Patch]https://git.kernel.org/stable/c/d23ad78bfd205eac26766e38ba7d79f279131098
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