CVE-2026-23413 (GCVE-0-2026-23413)

Vulnerability from cvelistv5 – Published: 2026-04-02 11:40 – Updated: 2026-08-05 12:21
VLAI
Title
clsact: Fix use-after-free in init/destroy rollback asymmetry
Summary
In the Linux kernel, the following vulnerability has been resolved: clsact: Fix use-after-free in init/destroy rollback asymmetry Fix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry. The latter is achieved by first fully initializing a clsact instance, and then in a second step having a replacement failure for the new clsact qdisc instance. clsact_init() initializes ingress first and then takes care of the egress part. This can fail midway, for example, via tcf_block_get_ext(). Upon failure, the kernel will trigger the clsact_destroy() callback. Commit 1cb6f0bae504 ("bpf: Fix too early release of tcx_entry") details the way how the transition is happening. If tcf_block_get_ext on the q->ingress_block ends up failing, we took the tcx_miniq_inc reference count on the ingress side, but not yet on the egress side. clsact_destroy() tests whether the {ingress,egress}_entry was non-NULL. However, even in midway failure on the replacement, both are in fact non-NULL with a valid egress_entry from the previous clsact instance. What we really need to test for is whether the qdisc instance-specific ingress or egress side previously got initialized. This adds a small helper for checking the miniq initialization called mini_qdisc_pair_inited, and utilizes that upon clsact_destroy() in order to fix the use-after-free scenario. Convert the ingress_destroy() side as well so both are consistent to each other.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 230bb13650b0f186f540500fd5f5f7096a822a2a , < a73d95b57bf9faebdfed591bcb7ed9292062a84c (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 37bef86e5428d59f70a4da82b80f9a8f252fecbe (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 4c9af67f99aa3e51b522c54968ab3ac8272be41c (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < 0509b762bc5e8ea7b8391130730c6d8502fc6e69 (git)
Affected: 1cb6f0bae50441f4b4b32a28315853b279c7404e , < a0671125d4f55e1e98d9bde8a0b671941987e208 (git)
Affected: f61ecf1bd5b562ebfd7d430ccb31619857e80857 (git)
Affected: 6.6.41 , < 6.6.130 (semver)
Affected: 6.9.10 , < 6.10 (semver)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (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)
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        "id": "CVE-2026-23413",
        "lastModified": "2026-06-17T10:21:32.113",
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        },
        "published": "2026-04-02T12:16:20.440",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:45:43+00:00",
      "cve": "CVE-2026-23413",
      "id": "CVE-2026-23413",
      "initial_release_date": "2026-04-02T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: clsact: Fix use-after-free in init/destroy rollback asymmetry",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23413.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:36:21Z",
      "cve": "CVE-2026-23413",
      "id": "CVE-2026-23413",
      "initial_release_date": "2026-04-02T23:28:05Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "398",
      "product_status:known_not_affected": "284",
      "product_status:recommended": "311",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23413",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23413.json",
      "version": "38"
    }
  }
}



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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

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.



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.