VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90135: Linux kernel · net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs()

Source GCVE Database

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Authoritative record:CVE-2026-90135· Medium

Not known to be exploited · fixed in b0859020cab4ea6101478141aeec1b052ed80bdd : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:05 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 b0859020cab4ea6101478141aeec1b052ed80bdd, 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c, 63ab05e8f9654aa100d366c0236399fda6ffaab1 +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-j74m-jp6j-hqp6

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d, < b0859020cab4ea6101478141aeec1b052ed80bdd	Fixed in b0859020cab4ea6101478141aeec1b052ed80bdd
LinuxLinux	Affected ≥ 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d, < 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c	Fixed in 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c
LinuxLinux	Affected ≥ 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d, < 63ab05e8f9654aa100d366c0236399fda6ffaab1	Fixed in 63ab05e8f9654aa100d366c0236399fda6ffaab1
LinuxLinux	Affected ≥ 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d, < 45be87c5195f34c0a51598bc91186f600be5c4c9	Fixed in 45be87c5195f34c0a51598bc91186f600be5c4c9
LinuxLinux	Affected ≥ 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d, < 5fe03b5257095e2beef0bc79e1f068fbd09a24c7	Fixed in 5fe03b5257095e2beef0bc79e1f068fbd09a24c7
LinuxLinux	Affected ≥ 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d, < 0b1c2af8a22c35cb099c735c2f63ea3ba757557d	Fixed in 0b1c2af8a22c35cb099c735c2f63ea3ba757557d

AI-suggested

A fix has been applied to the Linux kernel to add the missing ref_tracker_dir_exit() call in alloc_netdev_mqs() error paths. Users should update to a kernel version that includes this patch once available. No other mitigation steps are indicated.

Description

A use-after-free vulnerability in the Linux kernel's network device allocation function alloc_netdev_mqs() was fixed by adding a missing ref_tracker_dir_exit() call. The flaw could cause a crash when reading /sys/kernel/debug/ref_tracker/* if alloc_percpu() or dev_addr_init() failed during network device allocation.

References

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