Vulnerability-Lookup

CVE-2026-64522 (GCVE-0-2026-64522)

Vulnerability from cvelistv5 – Published: 2026-07-25 09:14 – Updated: 2026-07-25 09:14

Title

net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA

Summary

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA mlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating software state and skipping hardware offload setup. That path jumps to the common success label before taking the eswitch mode block. After tunnel-mode validation was moved earlier, the common success label unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs, this decrements esw->offloads.num_block_mode without a matching increment. Return directly after installing the acquire SA offload handle, so only the paths that successfully called mlx5_eswitch_block_mode() call the matching unblock.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b5bd4249e430f5963…
https://git.kernel.org/stable/c/ecafd8284e527666e…
https://git.kernel.org/stable/c/abe003b33223ff335…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 , < b5bd4249e430f5963d559708ee96a671716d2400 (git) Affected: 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 , < ecafd8284e527666e83261e6e57a7c7341d591cb (git) Affected: 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 , < abe003b33223ff33552f291644bf35d9c2f992fb (git) Affected: 993c4ba71596c30418ba5a0ddcf4f9c2f431466a (git) Affected: 6.17.4 , < 6.18 (semver)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
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              "versionType": "git"
            },
            {
              "lessThan": "ecafd8284e527666e83261e6e57a7c7341d591cb",
              "status": "affected",
              "version": "22239eb258bc1e6ccdb2d3502fce1cc2b2a88386",
              "versionType": "git"
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              "versionType": "git"
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              "version": "6.17.4",
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
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              "versionType": "semver"
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                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA\n\nmlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating\nsoftware state and skipping hardware offload setup.\n\nThat path jumps to the common success label before taking the eswitch mode\nblock. After tunnel-mode validation was moved earlier, the common success\nlabel unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs,\nthis decrements esw-\u003eoffloads.num_block_mode without a matching increment.\n\nReturn directly after installing the acquire SA offload handle, so only the\npaths that successfully called mlx5_eswitch_block_mode() call the matching\nunblock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T09:14:47.404Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400"
        },
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          "url": "https://git.kernel.org/stable/c/ecafd8284e527666e83261e6e57a7c7341d591cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/abe003b33223ff33552f291644bf35d9c2f992fb"
        }
      ],
      "title": "net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64522",
    "datePublished": "2026-07-25T09:14:47.404Z",
    "dateReserved": "2026-07-19T15:36:31.794Z",
    "dateUpdated": "2026-07-25T09:14:47.404Z",
    "state": "PUBLISHED"
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  }
}

GHSA-X5F7-RH4C-GXVR

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA

mlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating software state and skipping hardware offload setup.

That path jumps to the common success label before taking the eswitch mode block. After tunnel-mode validation was moved earlier, the common success label unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs, this decrements esw->offloads.num_block_mode without a matching increment.

Return directly after installing the acquire SA offload handle, so only the paths that successfully called mlx5_eswitch_block_mode() call the matching unblock.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64522"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA\n\nmlx5e_xfrm_add_state() handles acquire-flow temporary SAs by allocating\nsoftware state and skipping hardware offload setup.\n\nThat path jumps to the common success label before taking the eswitch mode\nblock. After tunnel-mode validation was moved earlier, the common success\nlabel unconditionally calls mlx5_eswitch_unblock_mode(). For acquire SAs,\nthis decrements esw-\u003eoffloads.num_block_mode without a matching increment.\n\nReturn directly after installing the acquire SA offload handle, so only the\npaths that successfully called mlx5_eswitch_block_mode() call the matching\nunblock.",
  "id": "GHSA-x5f7-rh4c-gxvr",
  "modified": "2026-07-25T12:31:39Z",
  "published": "2026-07-25T12:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64522"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abe003b33223ff33552f291644bf35d9c2f992fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecafd8284e527666e83261e6e57a7c7341d591cb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

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.

Action not permitted

CVE-2026-64522 (GCVE-0-2026-64522)

GHSA-X5F7-RH4C-GXVR

Tags

Sightings

Nomenclature