net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover

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Summary

CVECVE-2026-64122
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:53 UTC
Updated2026-07-19 16:17:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover mlx5e_tx_reporter_timeout_recover() accesses sq->netdev after mlx5e_safe_reopen_channels() has torn down and freed the channel (and its embedded SQs). Replace the three sq->netdev references with priv->netdev which is safe because priv outlives channel teardown. The netdev_err() call already used priv->netdev for this reason; make the trylock/unlock and health_channel_eq_recover calls consistent. This fixes the following KASAN splat: BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core] Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277 Call Trace: mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core] devlink_health_reporter_recover+0xa2/0x150 devlink_health_report+0x254/0x7c0 mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core] mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core] process_one_work+0x677/0xf20 worker_thread+0x51f/0xd90 kthread+0x3a5/0x810 ret_from_fork+0x208/0x400 ret_from_fork_asm+0x1a/0x30

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4329514c61abefe4961541b128c549b017bab5ad 1604a2d68414aa4cc34faac0b7faa9c14455e8d3 git Not specified
CNA Linux Linux affected 83ac0304a2d77519dae1e54c9713cbe1aedf19c9 152295aa7dc2c5e046606f7dadc84fce41136446 git Not specified
CNA Linux Linux affected 83ac0304a2d77519dae1e54c9713cbe1aedf19c9 7d260c5d2d89eb2c8c528d54b576b3aae3e20231 git Not specified
CNA Linux Linux affected 63f9d5fb4d8040077df801ca3270e2f02d55e0d9 git Not specified
CNA Linux Linux affected 6.18.14 6.18.34 semver Not specified
CNA Linux Linux affected 6.19.4 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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