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CVE-2026-64122 (GCVE-0-2026-64122)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39
VLAI
Title
net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
Summary
In 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
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4329514c61abefe4961541b128c549b017bab5ad , < 1604a2d68414aa4cc34faac0b7faa9c14455e8d3 (git)
Affected: 83ac0304a2d77519dae1e54c9713cbe1aedf19c9 , < 152295aa7dc2c5e046606f7dadc84fce41136446 (git)
Affected: 83ac0304a2d77519dae1e54c9713cbe1aedf19c9 , < 7d260c5d2d89eb2c8c528d54b576b3aae3e20231 (git)
Affected: 63f9d5fb4d8040077df801ca3270e2f02d55e0d9 (git)
Affected: 6.18.14 , < 6.18.34 (semver)
Affected: 6.19.4 , < 6.20 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover\n\nmlx5e_tx_reporter_timeout_recover() accesses sq-\u003enetdev after\nmlx5e_safe_reopen_channels() has torn down and freed the channel (and\nits embedded SQs). Replace the three sq-\u003enetdev references with\npriv-\u003enetdev which is safe because priv outlives channel teardown.\n\nThe netdev_err() call already used priv-\u003enetdev for this reason; make\nthe trylock/unlock and health_channel_eq_recover calls consistent.\n\nThis fixes the following KASAN splat:\n\n  BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n  Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277\n\n  Call Trace:\n   mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n   devlink_health_reporter_recover+0xa2/0x150\n   devlink_health_report+0x254/0x7c0\n   mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]\n   mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]\n   process_one_work+0x677/0xf20\n   worker_thread+0x51f/0xd90\n   kthread+0x3a5/0x810\n   ret_from_fork+0x208/0x400\n   ret_from_fork_asm+0x1a/0x30"
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              "value": "AV:N - The bug is reached from the mlx5e netdev TX-timeout watchdog recovery path on Mellanox ConnectX NICs deployed on internet-facing cloud/datacenter servers; remote peers generate outbound traffic that can stall TX queues and fire `ndo_tx_timeout`, leading to `mlx5e_tx_reporter_timeout_recover()` without any local syscall.\nAC:L - Once a TX timeout occurs, recovery is deterministic: `mlx5e_health_channel_eq_recover()` typically fails when no EQEs are pending, `mlx5e_safe_reopen_channels()` frees the embedded SQ, and the stale `sq-\u003enetdev` dereference in `netdev_unlock()` always follows on that fallback path rather than requiring a race the attacker cannot influence.\nPR:N - No capability checks or authentication gates exist on the TX-timeout \u2192 devlink health auto-recover call chain; an unauthenticated remote attacker who can send traffic to a host mlx5 interface can induce the watchdog/recovery sequence without root, CAP_NET_ADMIN, or user-namespace privileges.\nUI:N - Exploitation requires no victim user action such as mounting a filesystem or opening a file; it is triggered automatically by the kernel netdev watchdog and workqueue recovery once TX queues stall.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same host kernel security authority; this is not a VM-guest-to-host escape, IOMMU bypass, or other cross-boundary scenario.\nC:H - The KASAN splat confirms an 8-byte use-after-free read of `sq-\u003enetdev` from freed channel/SQ memory; UAF on this structure pointer can be leveraged for arbitrary kernel memory disclosure via heap reuse and controlled reads through the corrupted `net_device` reference.\nI:H - The UAF supplies a controlled `struct net_device *` to `netdev_unlock()`, which performs `mutex_unlock()` on attacker-influenced freed memory, enabling heap spraying and memory corruption primitives that can be developed into arbitrary kernel write or code execution.\nA:H - Use-after-free in kernel TX recovery provably causes KASAN faults and can panic or oops the host during `netdev_unlock()` on freed SQ memory, producing complete loss of kernel availability on affected mlx5 systems."
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T16:47:26+00:00",
      "cve": "CVE-2026-64122",
      "id": "CVE-2026-64122",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "261",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64122.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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