{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d0a22a4b03b8475b7aa3fa41243c26c291407844"
            },
            {
              "fixed": "1403989d1b502f4a2c0d0b42ccf1c25748442eff"
            },
            {
              "fixed": "1cae1bafdf9caa9b462b19af06b1a06902e4e142"
            },
            {
              "fixed": "764c3c84b5683e608f43735c803a5f415046686c"
            },
            {
              "fixed": "d87268326b277af3665237ac76a73dd9fa8e21b4"
            },
            {
              "fixed": "87d4954b5c59735a99ea98cb208d47130f6dce7d"
            },
            {
              "fixed": "6d76febba07c40bcf358f63216d36ea68cf1c215"
            },
            {
              "fixed": "815ddd27c0c7171a99fe802fdb19098ddef8b19d"
            },
            {
              "fixed": "faddeb848305e79db89ee0479bb0e33380656321"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.2.0"
            },
            {
              "fixed": "5.10.252"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.202"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45984.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix use-after-free in iomap inline data write path\n\nThe inline data buffer head (dibh) is being released prematurely in\ngfs2_iomap_begin() via release_metapath() while iomap-\u003einline_data\nstill points to dibh-\u003eb_data. This causes a use-after-free when\niomap_write_end_inline() later attempts to write to the inline data\narea.\n\nThe bug sequence:\n1. gfs2_iomap_begin() calls gfs2_meta_inode_buffer() to read inode\n   metadata into dibh\n2. Sets iomap-\u003einline_data = dibh-\u003eb_data + sizeof(struct gfs2_dinode)\n3. Calls release_metapath() which calls brelse(dibh), dropping refcount\n   to 0\n4. kswapd reclaims the page (~39ms later in the syzbot report)\n5. iomap_write_end_inline() tries to memcpy() to iomap-\u003einline_data\n6. KASAN detects use-after-free write to freed memory\n\nFix by storing dibh in iomap-\u003eprivate and incrementing its refcount\nwith get_bh() in gfs2_iomap_begin(). The buffer is then properly\nreleased in gfs2_iomap_end() after the inline write completes,\nensuring the page stays alive for the entire iomap operation.\n\nNote: A C reproducer is not available for this issue. The fix is based\non analysis of the KASAN report and code review showing the buffer head\nis freed before use.\n\n[agruenba: Take buffer head reference in gfs2_iomap_begin() to avoid\nleaks in gfs2_iomap_get() and gfs2_iomap_alloc().]",
  "id": "CVE-2026-45984",
  "modified": "2026-07-16T03:31:11.390103961Z",
  "published": "2026-05-27T12:18:42.964Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45984.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:27789"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:33743"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:35894"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:36049"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:36767"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:38902"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-45984"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45984.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45984"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481922"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "gfs2: Fix use-after-free in iomap inline data write path"
}