VulnerabilityPublished 18 Oct 2026

CVE-2026-98553: Linux kernel · autofs: fix sbi->pipe file reference leak in autofs_kill_sb()

Source GCVE Database

Authoritative record:CVE-2026-98553· Low

Not known to be exploited · fixed in fc4fd0281ac80b5a3c5a2330f688f0f9d2a420b6 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Low

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fc4fd0281ac80b5a3c5a2330f688f0f9d2a420b6, f1c57f5b16bbc3571bd479c290996c4d4e1fb931, aa5e44b29ffe4eaa08cc2237fd65bc2596bc023e +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

ghsa-j44w-wp8g-33m4

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7, < fc4fd0281ac80b5a3c5a2330f688f0f9d2a420b6	Fixed in fc4fd0281ac80b5a3c5a2330f688f0f9d2a420b6
LinuxLinux	Affected ≥ ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7, < f1c57f5b16bbc3571bd479c290996c4d4e1fb931	Fixed in f1c57f5b16bbc3571bd479c290996c4d4e1fb931
LinuxLinux	Affected ≥ ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7, < aa5e44b29ffe4eaa08cc2237fd65bc2596bc023e	Fixed in aa5e44b29ffe4eaa08cc2237fd65bc2596bc023e
LinuxLinux	Affected ≥ ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7, < a58593b501b7be5ad2bc5181bfa8cd4599be257c	Fixed in a58593b501b7be5ad2bc5181bfa8cd4599be257c
LinuxLinux	Affected ≥ ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7, < 3684e2273ba94553af3c5195a46a50214a1a96e3	Fixed in 3684e2273ba94553af3c5195a46a50214a1a96e3
LinuxLinux	Affected ≥ ebc921ca9b92a3cf304d99bd7b7f373ec78c7ed7, < 0662b1ff9b383d5a233d344e4dc518c27a17f7b8	Fixed in 0662b1ff9b383d5a233d344e4dc518c27a17f7b8

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to explicitly release the leaked file reference in autofs_kill_sb(). Users should update to the fixed kernel version once it is available.

Description

A vulnerability in the Linux kernel's autofs subsystem caused a file reference leak in the autofs_kill_sb() function. This leak occurs when autofs_fill_super() fails before clearing a specific flag, leading to a permanent leak of the pipe struct file reference. The issue was fixed by explicitly releasing the pipe reference if it remains after autofs_catatonic_mode() is called.

References

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