{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "01beba7957a26f9b7179127e8ad56bb5a0f56138"
            },
            {
              "fixed": "4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1"
            },
            {
              "fixed": "c3e2692c7a58e0bdb84bd658d827e89dcecea3ad"
            },
            {
              "fixed": "3b681229e9f8fb1dd29bc65983bf3c87779e4ca3"
            },
            {
              "fixed": "ab31e3b774f5d06b4489cef6c297b48c47c9dcbd"
            },
            {
              "fixed": "a54ffce4637acb0db8e695188a6c7f99f14c3576"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.3.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89839.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()\n\nf2fs_xattr_advise_set() calls inode_owner_or_capable() with \u0026nop_mnt_idmap\nbefore allowing the \"system.advise\" xattr to be set, instead of the idmap\nthat the VFS passes to the -\u003eset() handler.\n\nf2fs supports idmapped mounts, so on such a mount this checks the caller's\nfsuid against the unmapped on-disk owner rather than the mapped owner: the\nactual owner can be wrongly denied with -EPERM and an unrelated caller\nwrongly allowed.  Pass the handler's idmap instead.",
  "id": "CVE-2026-89839",
  "modified": "2026-09-18T03:30:39.349631682Z",
  "published": "2026-09-16T10:31:13.727Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b681229e9f8fb1dd29bc65983bf3c87779e4ca3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c0c610b480cfbc57528aa1acbd6be12ed2a6fb1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a54ffce4637acb0db8e695188a6c7f99f14c3576"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab31e3b774f5d06b4489cef6c297b48c47c9dcbd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3e2692c7a58e0bdb84bd658d827e89dcecea3ad"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89839.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89839"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()"
}