Linux kernel iavf PTP UAF on reset
CVE-2026-43447 Published on May 8, 2026
iavf: fix PTP use-after-free during reset
In the Linux kernel, the following vulnerability has been resolved:
iavf: fix PTP use-after-free during reset
Commit 7c01dbfc8a1c5f ("iavf: periodically cache PHC time") introduced a
worker to cache PHC time, but failed to stop it during reset or disable.
This creates a race condition where `iavf_reset_task()` or
`iavf_disable_vf()` free adapter resources (AQ) while the worker is still
running. If the worker triggers `iavf_queue_ptp_cmd()` during teardown, it
accesses freed memory/locks, leading to a crash.
Fix this by calling `iavf_ptp_release()` before tearing down the adapter.
This ensures `ptp_clock_unregister()` synchronously cancels the worker and
cleans up the chardev before the backing resources are destroyed.
Products Associated with CVE-2026-43447
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Affected Versions
Linux:- Version 7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 and below 1b034f2429ce6b45ce74dc266175d277acafc5c4 is affected.
- Version 7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 and below 90cc8b2add29b57288025b51c70bc647e7cccb12 is affected.
- Version 7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 and below efc54fb13d79117a825fef17364315a58682c7ec is affected.
- Version 6.15 is affected.
- Before 6.15 is unaffected.
- Version 6.18.19, <= 6.18.* is unaffected.
- Version 6.19.9, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.