cbcvebase.
CVE-2026-45984
published 2026-05-27

CVE-2026-45984: 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)…

PriorityP342high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.18%
8.3th percentile
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().]

Affected

59 ranges· showing 25
VendorProductVersion rangeFixed in
linuxlinux
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < 1403989d1b502f4a2c0d0b42ccf1c25748442eff1403989d1b502f4a2c0d0b42ccf1c25748442eff
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < 1cae1bafdf9caa9b462b19af06b1a06902e4e1421cae1bafdf9caa9b462b19af06b1a06902e4e142
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < 764c3c84b5683e608f43735c803a5f415046686c764c3c84b5683e608f43735c803a5f415046686c
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < d87268326b277af3665237ac76a73dd9fa8e21b4d87268326b277af3665237ac76a73dd9fa8e21b4
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < 87d4954b5c59735a99ea98cb208d47130f6dce7d87d4954b5c59735a99ea98cb208d47130f6dce7d
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < 6d76febba07c40bcf358f63216d36ea68cf1c2156d76febba07c40bcf358f63216d36ea68cf1c215
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < 815ddd27c0c7171a99fe802fdb19098ddef8b19d815ddd27c0c7171a99fe802fdb19098ddef8b19d
linuxlinux>= d0a22a4b03b8475b7aa3fa41243c26c291407844 < faddeb848305e79db89ee0479bb0e33380656321faddeb848305e79db89ee0479bb0e33380656321
linuxlinux_kernel
linuxlinux_kernel>= 5.11 < 5.15.2025.15.202
linuxlinux_kernel>= 5.16 < 6.1.1656.1.165
linuxlinux_kernel>= 5.2 < 5.10.2525.10.252
linuxlinux_kernel>= 6.13 < 6.18.146.18.14
linuxlinux_kernel>= 6.19 < 6.19.46.19.4
linuxlinux_kernel>= 6.2 < 6.6.1286.6.128
linuxlinux_kernel>= 6.7 < 6.12.756.12.75
ubuntulinux
ubuntulinux-aws
ubuntulinux-aws-5.15
ubuntulinux-aws-6.8
ubuntulinux-aws-fips
ubuntulinux-azure
ubuntulinux-azure-5.15
ubuntulinux-azure-6.8

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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