CVE-2026-72225 (GCVE-0-2026-72225)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-10-16 18:45
VLAI
Title
jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
Summary
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit() jbd2_journal_initialize_fast_commit() validates journal capacity by checking (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS). Both j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds j_last the subtraction wraps to a large value, bypassing the bounds check. The resulting underflow corrupts j_last, j_fc_first, and j_free, leading to journal abort. Fix by checking num_fc_blks against j_last before the subtraction, returning -EFSCORRUPTED.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 18:44 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < aa90f00932bf572d6ef284c977c2a60b39c13bd6 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < e144ad0250f77e23e28949587b8b57e40dc3b512 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < fb9b49618ed7296ebfad62a3835da8945f727001 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < 78955fdce8ff654e6d33a2fa90882a1e7eb26330 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < a58fc10adf503969fec2007b5afe8987258046c4 (git)
Affected: 6866d7b3f2bb4f011041ba54c98b1584497fe2fd , < 289a2ca0c9b7eae74f93fc213b0b971669b8683d (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "url": "https://git.kernel.org/stable/c/aa90f00932bf572d6ef284c977c2a60b39c13bd6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T05:26:06+00:00",
      "cve": "CVE-2026-72225",
      "id": "CVE-2026-72225",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72225.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T23:52:06Z",
      "cve": "CVE-2026-72225",
      "id": "CVE-2026-72225",
      "initial_release_date": "2026-08-31T16:27:00Z",
      "product_status:known_affected": "178",
      "product_status:known_not_affected": "185",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72225",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-72225.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-72225",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T18:44:09.066812Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T18:44:10.925Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/jbd2/journal.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
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                  "status": "affected",
                  "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
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                  "versionType": "git"
                },
                {
                  "lessThan": "4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6",
                  "status": "affected",
                  "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
                  "versionType": "git"
                },
                {
                  "lessThan": "fb9b49618ed7296ebfad62a3835da8945f727001",
                  "status": "affected",
                  "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
                  "versionType": "git"
                },
                {
                  "lessThan": "4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9",
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                  "versionType": "git"
                },
                {
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                  "status": "affected",
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                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/jbd2/journal.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.10"
                },
                {
                  "lessThan": "5.10",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.266",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.212",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.178",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.145",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.97",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.40",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.1.*",
                  "status": "unaffected",
                  "version": "7.1.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.266",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.212",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.178",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.145",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.97",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.40",
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                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.1.5",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.2",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()\n\njbd2_journal_initialize_fast_commit() validates journal capacity by\nchecking (journal-\u003ej_last - num_fc_blks \u003c JBD2_MIN_JOURNAL_BLOCKS).\nBoth j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds\nj_last the subtraction wraps to a large value, bypassing the bounds\ncheck.\n\nThe resulting underflow corrupts j_last, j_fc_first, and j_free,\nleading to journal abort.\n\nFix by checking num_fc_blks against j_last before the subtraction,\nreturning -EFSCORRUPTED."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable code is reached only via the ext4 mount path (mount/fsopen syscall) when enabling JBD2 fast commit in jbd2_journal_set_features(); it is not reachable through network-facing kernel services.\nAC:L - An attacker who can mount a crafted ext4 image fully controls journal superblock fields (s_num_fc_blks vs s_maxlen) and can reliably trigger the underflow on first-time fast-commit enable without races or rare kernel configs.\nPR:L - Triggering ext4 mount of a malicious image requires CAP_SYS_ADMIN, which an unprivileged local user can obtain inside a user/mount namespace (e.g. unshare -Urm) to mount loop-backed ext4 with fast_commit enabled.\nUI:N - Exploitation does not require a separate victim action beyond the attacker (or their namespace) performing the mount of the prepared filesystem image; no additional user interaction is needed.\nS:U - Impact is confined to journal/ext4 corruption and I/O within the mounting kernel context; it does not cross a VM, container, or IOMMU security boundary to affect a separate authority.\nC:H - Corrupted j_last/j_fc_first/j_free values drive subsequent jbd2_journal_bmap and journal I/O with attacker-influenced block indices, enabling out-of-bounds reads from the journal backing device and potential kernel memory disclosure.\nI:H - The same corrupted journal geometry can direct journal block allocations and writes to incorrect offsets on the backing block device, constituting exploitable metadata corruption with integrity impact beyond a simple error return.\nA:H - The fix commit and jbd2 abort path confirm the corruption leads to journal abort and mount/operational failure; repeated mounting of malicious images can deny filesystem availability and force recovery or remount-readonly."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-23T12:47:03.674Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/aa90f00932bf572d6ef284c977c2a60b39c13bd6"
            },
            {
              "url": "https://git.kernel.org/stable/c/e144ad0250f77e23e28949587b8b57e40dc3b512"
            },
            {
              "url": "https://git.kernel.org/stable/c/4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6"
            },
            {
              "url": "https://git.kernel.org/stable/c/fb9b49618ed7296ebfad62a3835da8945f727001"
            },
            {
              "url": "https://git.kernel.org/stable/c/4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9"
            },
            {
              "url": "https://git.kernel.org/stable/c/78955fdce8ff654e6d33a2fa90882a1e7eb26330"
            },
            {
              "url": "https://git.kernel.org/stable/c/a58fc10adf503969fec2007b5afe8987258046c4"
            },
            {
              "url": "https://git.kernel.org/stable/c/289a2ca0c9b7eae74f93fc213b0b971669b8683d"
            }
          ],
          "title": "jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-72225",
        "datePublished": "2026-08-15T05:54:17.541Z",
        "dateReserved": "2026-08-09T03:40:39.913Z",
        "dateUpdated": "2026-10-16T18:45:02.597Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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