CVE-2026-23440 (GCVE-0-2026-23440)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:06
VLAI
Title
net/mlx5e: Fix race condition during IPSec ESN update
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix race condition during IPSec ESN update In IPSec full offload mode, the device reports an ESN (Extended Sequence Number) wrap event to the driver. The driver validates this event by querying the IPSec ASO and checking that the esn_event_arm field is 0x0, which indicates an event has occurred. After handling the event, the driver must re-arm the context by setting esn_event_arm back to 0x1. A race condition exists in this handling path. After validating the event, the driver calls mlx5_accel_esp_modify_xfrm() to update the kernel's xfrm state. This function temporarily releases and re-acquires the xfrm state lock. So, need to acknowledge the event first by setting esn_event_arm to 0x1. This prevents the driver from reprocessing the same ESN update if the hardware sends events for other reason. Since the next ESN update only occurs after nearly 2^31 packets are received, there's no risk of missing an update, as it will happen long after this handling has finished. Processing the event twice causes the ESN high-order bits (esn_msb) to be incremented incorrectly. The driver then programs the hardware with this invalid ESN state, which leads to anti-replay failures and a complete halt of IPSec traffic. Fix this by re-arming the ESN event immediately after it is validated, before calling mlx5_accel_esp_modify_xfrm(). This ensures that any spurious, duplicate events are correctly ignored, closing the race window.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 3dffc083292e6872787bd7e34b957627622f9af4 (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 2051c709dce92da3550040aa7949cd5a9c89b14e (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 96c9c25b74686ac2de15921c9ad30c5ef13af8cd (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 8d625c15471fb8780125eaef682983a96af77bdc (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < beb6e2e5976a128b0cccf10d158124422210c5ef (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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This function temporarily releases and\\nre-acquires the xfrm state lock.\\n\\nSo, need to acknowledge the event first by setting esn_event_arm to\\n0x1. This prevents the driver from reprocessing the same ESN update if\\nthe hardware sends events for other reason. Since the next ESN update\\nonly occurs after nearly 2^31 packets are received, there\u0027s no risk of\\nmissing an update, as it will happen long after this handling has\\nfinished.\\n\\nProcessing the event twice causes the ESN high-order bits (esn_msb) to\\nbe incremented incorrectly. The driver then programs the hardware with\\nthis invalid ESN state, which leads to anti-replay failures and a\\ncomplete halt of IPSec traffic.\\n\\nFix this by re-arming the ESN event immediately after it is validated,\\nbefore calling mlx5_accel_esp_modify_xfrm(). 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    "redhat_vex": {
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      "cve": "CVE-2026-23440",
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      "product_status:known_affected": "198",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: Fix race condition during IPSec ESN update",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23440.json",
      "version": "3"
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      "product_status:first_fixed": "2",
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      "product_status:known_not_affected": "184",
      "product_status:recommended": "295",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23440",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23440.json",
      "version": "17"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.