VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c, 63ab05e8f9654aa100d366c0236399fda6ffaab1, 45be87c5195f34c0a51598bc91186f600be5c4c9 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
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
LinuxLinux	Affected =5.17	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: net: add missing ref_tracker_dir_exit() to alloc_netdev_mqs() sashiko is reporting that trying to read /sys/kernel/debug/ref_tracker/* causes use-afer-free crash when either alloc_percpu() or dev_addr_init() in alloc_netdev_mqs() failed, for commit 4d92b95ff2f9 ("net: add net device refcount tracker infrastructure") added ref_tracker_dir_exit() to only free_netdev() path.

References

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