CVE-2026-90135

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 2775bf36be7872834a7f8c0a0d9681a1a3e1cd4caffected
LinuxLinux4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 5fe03b5257095e2beef0bc79e1f068fbd09a24c7affected
LinuxLinux4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 63ab05e8f9654aa100d366c0236399fda6ffaab1affected
LinuxLinux4d92b95ff2f95f13df9bad0b5a25a9f60e72758d < 0b1c2af8a22c35cb099c735c2f63ea3ba757557daffected
LinuxLinux5.17affected
LinuxLinux0 < 5.17unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References