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

Vulnerability from cvelistv5 – Published: 2026-07-25 09:14 – Updated: 2026-10-19 20:48
VLAI
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
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:41 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 , < b5bd4249e430f5963d559708ee96a671716d2400 (git)
Affected: 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 , < ecafd8284e527666e83261e6e57a7c7341d591cb (git)
Affected: 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 , < abe003b33223ff33552f291644bf35d9c2f992fb (git)
Affected: 993c4ba71596c30418ba5a0ddcf4f9c2f431466a (git)
Affected: 6.17.4 , < 6.18 (semver)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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                  "value": "AV:N - A remote TCP SYN can cause the kernel to route a SYN-ACK through an administrator-configured outbound mlx5 IPsec policy, reaching xfrm_state_find() and the vulnerable acquire-SA callback.\nAC:L - Once the affected packet-offload policy is deployed without a matching SA, the first matching flow deterministically performs the unmatched decrement; no race must be won.\nPR:N - The remote peer needs no credentials or capabilities; configuring the mlx5 IPsec policy is a deployment prerequisite, not an attacker privilege.\nUI:R - The highest-impact stale-object path requires an administrator to request an eswitch mode transition after the attacker has cancelled the live mode-block reference.\nS:U - The resulting corruption affects the same host kernel and mlx5 device security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:H - The incorrectly permitted mode transition frees mlx5 IPsec structures while XFRM policies retain references to them, creating subsequent use-after-free callbacks capable of exposing kernel memory.\nI:H - The stale policy and flow-table references can be reclaimed and attacker-influenced, making the resulting kernel use-after-free potentially exploitable for arbitrary writes or control-flow hijacking.\nA:H - Mode-transition teardown or later automatic policy expiration can dereference freed IPsec and flow-rule objects, causing a kernel warning, oops, or panic."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:42:35.590Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400"
            },
            {
              "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",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64522",
        "datePublished": "2026-07-25T09:14:47.404Z",
        "dateReserved": "2026-07-19T15:36:31.794Z",
        "dateUpdated": "2026-10-16T15:42:39.098Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

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