CVE-2026-31694High· 7.8▾ MidnightPoC availableIn 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 diren…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 42.9 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
1 GitHub repo
Last analysed / modified upstream
0.3% → 0.3%
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.
linux_kernel >= 4.20, < 6.6.136linux_kernel >= 6.7, < 6.12.84linux_kernel >= 6.13, < 6.18.25linux_kernel >= 6.19, < 7.0.2linux_kernel = 7.1Upgrade past the affected range:
linux_kernel 7.0.2Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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