VulnerabilityPublished 25 Jun 2026Updated 6 Nov 2026

CVE-2026-53168: Linux kernel · fuse: reject fuse_notify() pagecache ops on directories

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e692f0cb86204dcdb9dddc0b355407eda6394a67 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in e692f0cb86204dcdb9dddc0b355407eda6394a67, dd92773d4d9cea010474eb08a5133c14ff6ab53a, bd23fa0c16c5c86e5b7713224ffbb87d9db81cca +5

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, < e692f0cb86204dcdb9dddc0b355407eda6394a67	Fixed in e692f0cb86204dcdb9dddc0b355407eda6394a67
LinuxLinux	Affected ≥ 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, < dd92773d4d9cea010474eb08a5133c14ff6ab53a	Fixed in dd92773d4d9cea010474eb08a5133c14ff6ab53a
LinuxLinux	Affected ≥ 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, < bd23fa0c16c5c86e5b7713224ffbb87d9db81cca	Fixed in bd23fa0c16c5c86e5b7713224ffbb87d9db81cca
LinuxLinux	Affected ≥ 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, < 15487f98863dc7156ed43c5be26d478beb82ba35	Fixed in 15487f98863dc7156ed43c5be26d478beb82ba35
LinuxLinux	Affected ≥ 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, < 99c317d7f8b7bbf3de16d20a01f363e390114cea	Fixed in 99c317d7f8b7bbf3de16d20a01f363e390114cea
LinuxLinux	Affected ≥ 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0, < 12df4cfa738aefff21756728e91056d7defb0fe6	Fixed in 12df4cfa738aefff21756728e91056d7defb0fe6

Description

In the Linux kernel, the following vulnerability has been resolved: fuse: reject fuse_notify() pagecache ops on directories The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the FUSE daemon to actively write/read pagecache contents. For directories with FOPEN_CACHE_DIR, the pagecache is used as kernel-internal cache storage, and userspace is not supposed to have direct access to this cache - in particular, fuse_parse_cache() will hit WARN_ON() if the cache contains bogus data. Reject FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE on anything other than regular files with -EINVAL.

References

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