CVE-2026-31694
- Source
- https://cve.org/CVERecord?id=CVE-2026-31694
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31694.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-31694
- Downstream
- Related
- Published
- 2026-05-01T13:53:36.048Z
- Modified
- 2026-07-09T18:29:42.418349713Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- fuse: reject oversized dirents in page cache
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
fuse: reject oversized dirents in page cache
fuseadddirenttocache() 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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31694.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5
- https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed
- https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31694.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-31694
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git