CVE-2026-31694
HIGHAttack Surface
CVSS Vector Breakdown
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.
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| linux | linux_kernel | 6.15 – 6.18.25 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| siemens | simatic_s7-1500_tm_mfp_firmware | - |