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CVE-2026-23281

wifi: libertas: fix use-after-free in lbs_free_adapter()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: fix use-after-free in lbs_free_adapter() The lbs_free_adapter() function uses timer_delete() (non-synchronous) for both command_timer and tx_lockup_timer before the structure is freed. This is incorrect because timer_delete() does not wait for any running timer callback to complete. If a timer callback is executing when lbs_free_adapter() is called, the callback will access freed memory since lbs_cfg_free() frees the containing structure immediately after lbs_free_adapter() returns. Both timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler) access priv->driver_lock, priv->cur_cmd, priv->dev, and other fields, which would all be use-after-free violations. Use timer_delete_sync() instead to ensure any running timer callback has completed before returning. This bug was introduced in commit 8f641d93c38a ("libertas: detect TX lockups and reset hardware") where del_timer() was used instead of del_timer_sync() in the cleanup path. The command_timer has had the same issue since the driver was first written.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in 09f3c30ab3b1371eaf9676a1b8add57bca763083; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in 3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in 3c5c818c78b03a1725f3dcd566865c77b48dd3a6; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in d0155fe68f31b339961cf2d4f92937d57e9384e6; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in ed7d30f90b77f73a47498686ede83f622b7e4f0d; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in a9f55b14486426d907459bced5825a25063bd922; From 954ee164f4f4598afc172c0ec3865d0352e55a0b · fixed in 03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0

  • Linux Linux

    2.6.24

  • KernelLinux

    From 2.6.24 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.17; From 6.19.0 · fixed in 6.19.7

References 8

git.kernel.org