Use-after-free in Linux kernel GFS2 iomap inline data write path
CVE-2026-45984 is a Linux kernel vulnerability in the GFS2 filesystem inline-data write path. In gfs2_iomap_begin(), inode metadata is read into the inline data buffer head (dibh) via gfs2_meta_inode_buffer(), and iomap->inline_data is set to point into dibh->b_data at an offset past struct gfs2_dinode. The bug is that gfs2_iomap_begin() then calls release_metapath(), which invokes brelse(dibh) and can drop the buffer-head reference count to zero while iomap->inline_data still references that memory. If the backing page is reclaimed before the write completes, iomap_write_end_inline() later performs memcpy() to iomap->inline_data, resulting in a kernel use-after-free write. The issue was identified from a KASAN report and code review. The fix stores dibh in iomap->private, takes an additional reference with get_bh() in gfs2_iomap_begin(), and releases it in gfs2_iomap_end() after the inline write operation completes.
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Linux kernel vulnerability in thermal core governor cleanup handling.
A Linux kernel vulnerability in GFS2 involving inode glock locking during buffered writes.
A Linux kernel gfs2 use-after-free vulnerability in the iomap inline data write path, caused by premature release of a buffer head while inline_data still references freed memory.
Linux kernel vulnerability in GFS2 related to inode glock locking during buffered writes.
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