CVE-2026-43066 (GCVE-0-2026-43066)

Vulnerability from cvelistv5 – Published: 2026-05-05 15:23 – Updated: 2026-05-11 22:17
VLAI
Title
ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths During code review, Joseph found that ext4_fc_replay_inode() calls ext4_get_fc_inode_loc() to get the inode location, which holds a reference to iloc.bh that must be released via brelse(). However, several error paths jump to the 'out' label without releasing iloc.bh: - ext4_handle_dirty_metadata() failure - sync_dirty_buffer() failure - ext4_mark_inode_used() failure - ext4_iget() failure Fix this by introducing an 'out_brelse' label placed just before the existing 'out' label to ensure iloc.bh is always released. Additionally, make ext4_fc_replay_inode() propagate errors properly instead of always returning 0.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 0892f12cd49fde5d5db68137923db107f894f3a3 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 5a63033696e60b5d70816f1d119645ac5b0b0a03 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < 19782b4c793b49a6aa4abbb307ddff3610009d21 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < f7817ad399d604e8639005d87d148b5ec626ad26 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < c426231e3d51916e83b6d1ab7ed8a65e83bca5b4 (git)
Affected: 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 , < ec0a7500d8eace5b4f305fa0c594dd148f0e8d29 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "url": "https://git.kernel.org/stable/c/19782b4c793b49a6aa4abbb307ddff3610009d21"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5a63033696e60b5d70816f1d119645ac5b0b0a03"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c426231e3d51916e83b6d1ab7ed8a65e83bca5b4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ec0a7500d8eace5b4f305fa0c594dd148f0e8d29"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f7817ad399d604e8639005d87d148b5ec626ad26"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-02T19:45:38+00:00",
      "cve": "CVE-2026-43066",
      "id": "CVE-2026-43066",
      "initial_release_date": "2026-05-05T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43066.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:21:32Z",
      "cve": "CVE-2026-43066",
      "id": "CVE-2026-43066",
      "initial_release_date": "2026-05-06T01:40:37Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "528",
      "product_status:known_not_affected": "175",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43066",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43066.json",
      "version": "21"
    }
  }
}



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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.