What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

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.

Affected products

• Linux: 5.17 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b1c2af8a22c35cb099c735c2f63ea3ba757557d
• https://git.kernel.org/stable/c/2775bf36be7872834a7f8c0a0d9681a1a3e1cd4c
• https://git.kernel.org/stable/c/45be87c5195f34c0a51598bc91186f600be5c4c9
• https://git.kernel.org/stable/c/5fe03b5257095e2beef0bc79e1f068fbd09a24c7
• https://git.kernel.org/stable/c/63ab05e8f9654aa100d366c0236399fda6ffaab1
• https://git.kernel.org/stable/c/b0859020cab4ea6101478141aeec1b052ed80bdd

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