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CVE-2026-45984

gfs2: Fix use-after-free in iomap inline data write path

High7.8EPSS 0.18%
Published
Updated
Reserved
Assigned by
Linux

Description

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().]

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-45984, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
redhat-SADPADP (enrichment)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.18% · top 92% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

Affected products

  • Linux · Linux

    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < 1403989d1b502f4a2c0d0b42ccf1c25748442eff
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < 1cae1bafdf9caa9b462b19af06b1a06902e4e142
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < 764c3c84b5683e608f43735c803a5f415046686c
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < d87268326b277af3665237ac76a73dd9fa8e21b4
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < 87d4954b5c59735a99ea98cb208d47130f6dce7d
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < 6d76febba07c40bcf358f63216d36ea68cf1c215
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < 815ddd27c0c7171a99fe802fdb19098ddef8b19d
    • affected d0a22a4b03b8475b7aa3fa41243c26c291407844 – < faddeb848305e79db89ee0479bb0e33380656321

  • Linux · Linux

    • affected 5.2
    • unaffected < 5.2
    • unaffected 5.10.252 – ≤ 5.10.*
    • unaffected 5.15.202 – ≤ 5.15.*
    • unaffected 6.1.165 – ≤ 6.1.*
    • unaffected 6.6.128 – ≤ 6.6.*
    • unaffected 6.12.75 – ≤ 6.12.*
    • unaffected 6.18.14 – ≤ 6.18.*
    • unaffected 6.19.4 – ≤ 6.19.*
    • unaffected 7.0 – ≤ *

References (29)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .