CVE-2022-50333 (GCVE-0-2022-50333)
Vulnerability from cvelistv5
Published
2025-09-15 14:49
Modified
2026-08-05 08:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: jfs: fix shift-out-of-bounds in dbDiscardAG This should be applied to most URSAN bugs found recently by syzbot, by guarding the dbMount. As syzbot feeding rubbish into the bmap descriptor.
References
Impacted products
Vendor Product Version
Linux Linux Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
Version: b40c2e665cd552eae5fbdbb878bc29a34357668e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/jfs/jfs_dmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "b40c2e665cd552eae5fbdbb878bc29a34357668e",
              "versionType": "git"
            },
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              "versionType": "git"
            },
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            },
            {
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/jfs/jfs_dmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.7"
            },
            {
              "lessThan": "3.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.337",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.303",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.337",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.303",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.270",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.229",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.86",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "3.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: jfs: fix shift-out-of-bounds in dbDiscardAG\n\nThis should be applied to most URSAN bugs found recently by syzbot,\nby guarding the dbMount. As syzbot feeding rubbish into the bmap\ndescriptor."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only by mounting a crafted JFS block device/image so dbMount loads attacker-controlled bmap fields; there is no network or adjacent-protocol entry into fs/jfs.\nAC:L - A malicious on-disk bmap with (mapsize-1)\u003e\u003eagl2size \u003e MAXAG deterministically yields out-of-range AG indices and triggers OOB db_agfree access / shift UB on FITRIM or allocation; the attacker fully controls that layout with no race.\nPR:N - The attacker needs no account on the target\u2014only a malicious JFS image (USB stick, disk/container image, or media presented to udisks2/automount on desktops, kiosks, or embedded systems).\nUI:R - jfs is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so CAP_SYS_ADMIN is required to mount; a victim or automount daemon must mount the attacker-supplied volume before the OOB path runs.\nS:U - Impact is host-kernel heap OOB on the in-memory bmap descriptor under the same OS security authority; it is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Invalid AG counts cause out-of-bounds reads of bmp-\u003edb_agfree[agno] (and related AG state) past MAXAG; per guidance OOB reads are Confidentiality High.\nI:H - Allocation/free paths perform bmp-\u003edb_agfree[agno] -= / += nblocks with attacker-influenced agno, corrupting adjacent bmap heap fields and enabling write/control-flow primitives; OOB write is Integrity High.\nA:H - The demonstrated UBSAN shift-out-of-bounds in dbDiscardAG and OOB AG indexing can oops/panic the kernel, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:15.308Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f8d4d0bac603616e2fa4a3907e81ed13f8f3c380"
        },
        {
          "url": "https://git.kernel.org/stable/c/0183c8f46ab5bcd0740f41c87f5141c6ca2bf1bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/624843f1bac448150f6859999c72c4841c14a2e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/50163a115831ef4e6402db5a7ef487d1989d7249"
        },
        {
          "url": "https://git.kernel.org/stable/c/911999b193735cd378517b6cd5fe585ee345d49c"
        },
        {
          "url": "https://git.kernel.org/stable/c/10b87da8fae79c7daf5eda6a9e4f1d31b85b4d92"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab5cd3d62c2493eca3337e7d0178cc7bd819ca64"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d340b684dcec5e34efc470227cd1c7d2df121ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/25e70c6162f207828dd405b432d8f2a98dbf7082"
        }
      ],
      "title": "fs: jfs: fix shift-out-of-bounds in dbDiscardAG",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50333",
    "datePublished": "2025-09-15T14:49:46.222Z",
    "dateReserved": "2025-09-15T14:18:36.816Z",
    "dateUpdated": "2026-08-05T08:58:15.308Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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