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

Vulnerability from cvelistv5 – Published: 2026-05-27 12:18 – Updated: 2026-08-25 12:05
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
URL Tags
https://git.kernel.org/stable/c/1403989d1b502f4a2…
https://git.kernel.org/stable/c/1cae1bafdf9caa9b4…
https://git.kernel.org/stable/c/764c3c84b5683e608…
https://git.kernel.org/stable/c/d87268326b277af36…
https://git.kernel.org/stable/c/87d4954b5c59735a9…
https://git.kernel.org/stable/c/6d76febba07c40bcf…
https://git.kernel.org/stable/c/815ddd27c0c7171a9…
https://git.kernel.org/stable/c/faddeb848305e79db…
https://access.redhat.com/security/cve/CVE-2026-45984 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2481922 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:51603 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36767 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:38902 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59143 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33743 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59146 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35894 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:55444 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59142 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59147 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59145 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59148 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59149 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36049 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:51604 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
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 8 Unaffected: 0:4.18.0-553.139.1.rt7.480.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.139.1.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:4.18.0-372.199.1.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:4.18.0-372.199.1.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:4.18.0-477.159.1.el8_8 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:4.18.0-477.159.1.el8_8 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-687.17.1.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.186.1.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.186.1.rt14.471.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:5.14.0-427.136.1.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:5.14.0-570.127.1.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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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 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 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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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-24T20:01:02+00:00",
      "cve": "CVE-2026-45984",
      "id": "CVE-2026-45984",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:fixed": "1502",
      "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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Tags
Taxonomy of the tags.





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.