CVE-2026-64122 (GCVE-0-2026-64122)
Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39
VLAI
EPSS
VEX
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)
Assigner
References
Impacted products
2 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 | |
| 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 |
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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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"id": "CVE-2026-64122",
"lastModified": "2026-08-13T15:11:37.460",
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"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",
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"cve": "CVE-2026-64122",
"id": "CVE-2026-64122",
"initial_release_date": "2026-07-21T12:59:18Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64122",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64122.json",
"version": "2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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