{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext2/inode.c",
            "fs/ext2/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "55e66d84b5272c425b324a2b247cdacacf1e10b9",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b879565effd88fc119c2efea3f3868a9997ed9ba",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "e54de654423bee98d1ba50379b09daf97c7854a6",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5481766125041e71662f2e32ee0e91ad5f4d07f4",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5efb3350230fef831167740e69e6db2861101186",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "356984d1a5c32e94810cbb6c8dc7d8ff2d4d919a",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext2/inode.c",
            "fs/ext2/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next2: Fix lost inode updates for IS_SYNC inodes\n\next2_setsize() and ext2_xattr_set2() had a construct like:\n\n\tif (IS_SYNC(inode)) {\n\t\tsync_inode_metadata(inode, 1);\n\t} else {\n\t\tmark_inode_dirty(inode);\n\t}\n\nwhich leads to lost inode updates for IS_SYNC inodes because\nsync_inode_metadata() does anything only if the inode is already dirty\nand hence inode updates may be simply lost. Fix the problem by\nunconditionally marking the inode dirty and *then* call\nsync_inode_metadata()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - nfsd SETATTR/SETXATTR and ksmbd truncate/EA handling call notify_change()/vfs_setxattr() into ext2_setattr()/ext2_xattr_set2() when an ext2 volume is NFS/SMB-exported (NAS and embedded USB-storage appliances, including sync-mounted disks); a remote client with write access therefore reaches the lost IS_SYNC inode update without a local shell.\nAC:L - The attacker can put the target in the IS_SYNC state at will (owner-writable FS_IOC_SETFLAGS/chattr +S, or a sync-mounted export) and then deterministically truncate or set/remove xattrs; sync_inode_metadata() skips a clean inode every time, with no race or memory layout outside attacker control.\nPR:L - The path is gated only by ordinary VFS write checks (inode_permission MAY_WRITE, xattr_permission for user.* xattrs, or inode_owner_or_capable() for FS_IOC_SETFLAGS); an unprivileged local user or a low-privilege NFS/SMB client with write access to a file suffices, and no init-namespace capability is required.\nUI:N - The attacker performs every step themselves (setting the SYNC flag, truncating or changing xattrs/ACLs, and driving inode reclaim); no separate victim action such as mounting a crafted image is required.\nS:U - Impact is confined to filesystem metadata and file data on the host that mounted the ext2 volume; this is not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - Removing the last xattr on an IS_SYNC inode frees the EA block without persisting i_file_acl=0, leaving a dangling on-disk pointer; after that block is reused, ext2_xattr_get() memcpy()s its contents to userspace when the header looks valid, so the filesystem-level UAF discloses other files\u0027 data.\nI:H - The lost i_file_acl update leaves the on-disk inode pointing at a freed EA block, so a later in-place xattr write can corrupt whatever reused that block, including other users\u0027 files and metadata; intended-durable IS_SYNC size/ctime/ACL updates can also fail to land, corrupting filesystem state.\nA:H - Reloading the stale i_file_acl and reading an invalid reused EA block calls ext2_error(), which panics on errors=panic and remounts the volume read-only on errors=remount-ro; the resulting filesystem inconsistency can also render files and the volume unavailable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:32:18.488Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/55e66d84b5272c425b324a2b247cdacacf1e10b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b879565effd88fc119c2efea3f3868a9997ed9ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/e54de654423bee98d1ba50379b09daf97c7854a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5481766125041e71662f2e32ee0e91ad5f4d07f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/5efb3350230fef831167740e69e6db2861101186"
        },
        {
          "url": "https://git.kernel.org/stable/c/356984d1a5c32e94810cbb6c8dc7d8ff2d4d919a"
        }
      ],
      "title": "ext2: Fix lost inode updates for IS_SYNC inodes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89601",
    "datePublished": "2026-09-11T19:45:04.667Z",
    "dateReserved": "2026-09-11T19:38:34.732Z",
    "dateUpdated": "2026-10-30T12:32:18.488Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}