CVE-2026-53311 is a vulnerability in Linux Kernel
Published on June 26, 2026
fuse: fix uninit-value in fuse_dentry_revalidate()
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
[...]
=====================================================
Products Associated with CVE-2026-53311
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Affected Versions
Linux:- Version 2396356a945bb022aff02656f59c2a45d457043f and below da3d241c5b925f17a9d8051d7a9e0d454d8e01f6 is affected.
- Version 2396356a945bb022aff02656f59c2a45d457043f and below 3ac9117ba3deab8a5dd22847355f861686f4bee7 is affected.
- Version 2396356a945bb022aff02656f59c2a45d457043f and below 5a6baf204610589f8a5b5a1cd69d1fe661d9d3cd is affected.
- Version 6.16 is affected.
- Before 6.16 is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.