VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90139: Linux kernel · fuse: check for NULL root inode in fuse_fill_super_submount

Source GCVE Database

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Authoritative record:CVE-2026-90139· Medium

Not known to be exploited · fixed in e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:18 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1, a5129155ca9fba40d77ff19ffead8244e88d6f9c, 17120c5bfb16808509ea18d7fab6027802d93eba +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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 30 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.
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.

ghsa-462h-76x8-ccqr

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1866d779d5d2abae59d304e809600ca3ca8d0071, < e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1	Fixed in e0b7f2922f6bd4c23cbddb7d1fc2bada570d27d1
LinuxLinux	Affected ≥ 1866d779d5d2abae59d304e809600ca3ca8d0071, < a5129155ca9fba40d77ff19ffead8244e88d6f9c	Fixed in a5129155ca9fba40d77ff19ffead8244e88d6f9c
LinuxLinux	Affected ≥ 1866d779d5d2abae59d304e809600ca3ca8d0071, < 17120c5bfb16808509ea18d7fab6027802d93eba	Fixed in 17120c5bfb16808509ea18d7fab6027802d93eba
LinuxLinux	Affected ≥ 1866d779d5d2abae59d304e809600ca3ca8d0071, < 4844aeb0de5fb0de4f7c9aaf2bf05cb8cffe60d5	Fixed in 4844aeb0de5fb0de4f7c9aaf2bf05cb8cffe60d5
LinuxLinux	Affected ≥ 1866d779d5d2abae59d304e809600ca3ca8d0071, < 928f659a3e3650978a5b4829cc982324f72b474b	Fixed in 928f659a3e3650978a5b4829cc982324f72b474b
LinuxLinux	Affected ≥ 1866d779d5d2abae59d304e809600ca3ca8d0071, < 509f4a09bae7f03c87f67f053648874a5e177867	Fixed in 509f4a09bae7f03c87f67f053648874a5e177867

AI-suggested

A fix has been implemented that returns an error (-ENOMEM) when inode allocation fails, preventing the null pointer dereference and kernel crash. Users should apply the official kernel update containing this fix to mitigate the issue.

Description

A vulnerability in the Linux kernel's FUSE subsystem occurs when fuse_fill_super_submount does not check for a NULL root inode returned by fuse_iget. This can lead to a null pointer dereference and kernel oops under memory pressure conditions.

References

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