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

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Summary

CVECVE-2026-23281
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 11:16:22 UTC
Updated2026-04-18 09:16:16 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000320000 probability, percentile 0.092520000 (date 2026-04-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4 git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b 09f3c30ab3b1371eaf9676a1b8add57bca763083 git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b 3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b 3c5c818c78b03a1725f3dcd566865c77b48dd3a6 git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b d0155fe68f31b339961cf2d4f92937d57e9384e6 git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b ed7d30f90b77f73a47498686ede83f622b7e4f0d git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b a9f55b14486426d907459bced5825a25063bd922 git Not specified
CNA Linux Linux affected 954ee164f4f4598afc172c0ec3865d0352e55a0b 03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0 git Not specified
CNA Linux Linux affected 2.6.24 Not specified
CNA Linux Linux unaffected 2.6.24 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.17 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.7 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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