CVE-2026-45984 (GCVE-0-2026-45984)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-07-09 12:09
VLAI
Title
gfs2: Fix use-after-free in iomap inline data write path
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in iomap inline data write path The inline data buffer head (dibh) is being released prematurely in gfs2_iomap_begin() via release_metapath() while iomap->inline_data still points to dibh->b_data. This causes a use-after-free when iomap_write_end_inline() later attempts to write to the inline data area. The bug sequence: 1. gfs2_iomap_begin() calls gfs2_meta_inode_buffer() to read inode metadata into dibh 2. Sets iomap->inline_data = dibh->b_data + sizeof(struct gfs2_dinode) 3. Calls release_metapath() which calls brelse(dibh), dropping refcount to 0 4. kswapd reclaims the page (~39ms later in the syzbot report) 5. iomap_write_end_inline() tries to memcpy() to iomap->inline_data 6. KASAN detects use-after-free write to freed memory Fix by storing dibh in iomap->private and incrementing its refcount with get_bh() in gfs2_iomap_begin(). The buffer is then properly released in gfs2_iomap_end() after the inline write completes, ensuring the page stays alive for the entire iomap operation. Note: A C reproducer is not available for this issue. The fix is based on analysis of the KASAN report and code review showing the buffer head is freed before use. [agruenba: Take buffer head reference in gfs2_iomap_begin() to avoid leaks in gfs2_iomap_get() and gfs2_iomap_alloc().]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-826 - Premature Release of Resource During Expected Lifetime
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < 1403989d1b502f4a2c0d0b42ccf1c25748442eff (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < 1cae1bafdf9caa9b462b19af06b1a06902e4e142 (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < 764c3c84b5683e608f43735c803a5f415046686c (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < d87268326b277af3665237ac76a73dd9fa8e21b4 (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < 87d4954b5c59735a99ea98cb208d47130f6dce7d (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < 6d76febba07c40bcf358f63216d36ea68cf1c215 (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < 815ddd27c0c7171a99fe802fdb19098ddef8b19d (git)
Affected: d0a22a4b03b8475b7aa3fa41243c26c291407844 , < faddeb848305e79db89ee0479bb0e33380656321 (git)
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Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux BaseOS (v. 8)     cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.6)     cpe:/o:redhat:rhel_aus:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)     cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.4)     cpe:/o:redhat:rhel_e4s:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux CRB (v. 8)     cpe:/a:redhat:enterprise_linux:8::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Enterprise Linux NFV (v. 8)     cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 9)     cpe:/a:redhat:enterprise_linux:9::nfv
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Red Hat Red Hat Enterprise Linux RT (v. 8)     cpe:/a:redhat:enterprise_linux:8::realtime
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::realtime
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Red Hat Red Hat Enterprise Linux Real Time (v. 9)     cpe:/a:redhat:enterprise_linux:9::realtime
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux for NVIDIA 26     cpe:/a:redhat:enterprise_linux_nvidia:
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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          "value": "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().]"
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-30T10:46:25.407Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff"
        },
        {
          "url": "https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142"
        },
        {
          "url": "https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215"
        },
        {
          "url": "https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d"
        },
        {
          "url": "https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321"
        }
      ],
      "title": "gfs2: Fix use-after-free in iomap inline data write path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45984",
    "datePublished": "2026-05-27T12:18:42.964Z",
    "dateReserved": "2026-05-13T15:03:33.090Z",
    "dateUpdated": "2026-07-09T12:09:55.000Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45984",
      "date": "2026-07-10",
      "epss": "0.0031",
      "percentile": "0.22832"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45984\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:15.640\",\"lastModified\":\"2026-07-09T13:17:21.000\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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().]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/gfs2/bmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"1403989d1b502f4a2c0d0b42ccf1c25748442eff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"1cae1bafdf9caa9b462b19af06b1a06902e4e142\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"764c3c84b5683e608f43735c803a5f415046686c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"d87268326b277af3665237ac76a73dd9fa8e21b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"87d4954b5c59735a99ea98cb208d47130f6dce7d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"6d76febba07c40bcf358f63216d36ea68cf1c215\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"815ddd27c0c7171a99fe802fdb19098ddef8b19d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0a22a4b03b8475b7aa3fa41243c26c291407844\",\"lessThan\":\"faddeb848305e79db89ee0479bb0e33380656321\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/gfs2/bmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.14\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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lla.redhat.com/show_bug.cgi?id=2481922\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45984.json\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-08T18:47:33+00:00",
      "cve": "CVE-2026-45984",
      "id": "CVE-2026-45984",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:fixed": "736",
      "product_status:known_affected": "50",
      "product_status:known_not_affected": "76",
      "product_status:under_investigation": "17",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: gfs2: Fix use-after-free in iomap inline data write path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45984.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.