CVE-2026-45984
7.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in iomap inline data write path The inline...
Published: 2026-05-27 · Last updated: 2026-06-16
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-416
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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().]
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-45984
- [Patch]https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff
- [Patch]https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142
- [Patch]https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215
- [Patch]https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c
- [Patch]https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d
- [Patch]https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d
- [Patch]https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4
- [Patch]https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321
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