Medium 5.5Published Jun 26, 2026

CVE-2026-53311fuse: fix uninit-value in fuse_dentry_revalidate()

Updated under an hour ago (Oct 27, 2026, 6:10 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: fuse: fix uninit-value in fuse_dentry_revalidate() fuse_dentry_revalidate() may be called with a dentry that didn't had ->d_time initialised. The issue was found with KMSAN, where lookup_open() calls __d_alloc(), followed by d_revalidate(), as shown below: ===================================================== BUG: KMSAN: uninit-value in fuse_dentry_revalidate+0x150/0x13d0 fs/fuse/dir.c:394 fuse_dentry_revalidate+0x150/0x13d0 fs/fuse/dir.c:394 d_revalidate fs/namei.c:1030 [inline] lookup_open fs/namei.c:4405 [inline] open_last_lookups fs/namei.c:4583 [inline] path_openat+0x1614/0x64c0 fs/namei.c:4827 do_file_open+0x2aa/0x680 fs/namei.c:4859 [...] Uninit was created at: slab_post_alloc_hook mm/slub.c:4466 [inline] slab_alloc_node mm/slub.c:4788 [inline] kmem_cache_alloc_lru_noprof+0x382/0x1280 mm/slub.c:4807 __d_alloc+0x55/0xa00 fs/dcache.c:1740 d_alloc_parallel+0x99/0x2740 fs/dcache.c:2604 lookup_open fs/namei.c:4398 [inline] open_last_lookups fs/namei.c:4583 [inline] path_openat+0x135f/0x64c0 fs/namei.c:4827 do_file_open+0x2aa/0x680 fs/namei.c:4859 [...] =====================================================

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 2396356a945bb022aff02656f59c2a45d457043f before da3d241c5b925f17a9d8051d7a9e0d454d8e01f6; 2396356a945bb022aff02656f59c2a45d457043f builds before 3ac9117ba3deab8a5dd22847355f861686f4bee7; 2396356a945bb022aff02656f59c2a45d457043f builds before 5a6baf204610589f8a5b5a1cd69d1fe661d9d3cd	CNA record
linux linux_kernel linux:linux_kernel	from 6.16 before 6.18.34; from 6.19 before 7.0.10	NVD

References

References

https://git.kernel.org/stable/c/da3d241c5b925f17a9d8051d7a9e0d454d8e01f6	patch
https://git.kernel.org/stable/c/3ac9117ba3deab8a5dd22847355f861686f4bee7	patch
https://git.kernel.org/stable/c/5a6baf204610589f8a5b5a1cd69d1fe661d9d3cd	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.