CVE-2025-21758

In the Linux kernel, a vulnerability was found in the amdgpu driver where amdgpu_devcoredump_format() recursively acquires a ww_mutex lock. This can lead to a deadlock when dumping IB contents from a hung job. The fix moves the operation to a separate helper using a single drm_exec context.

In the Linux kernel, the drm/xe driver's DPT allocation paths were fixed. The fallback from VRAM to system memory was removed as it did not work and caused black screen with pipe faults. Also, stolen memory usage is avoided due to latency and risk of random system hangs under load.

In the Linux kernel, a vulnerability in the msm serial driver was fixed by disabling DMA for the console UART. Concurrent writes from userspace and the kernel can trigger a race condition resulting in an infinite loop of the same messages. The fix disables DMA for the console UART to ensure a reliable output path.

In the Linux kernel, a fix was made for an uncancelled rxrpc OOB message handler in AFS. The fix cancels OOB message processing (typically to respond to security challenges) and moves it to afs_wq so it is also waited for. The OOB handler now returns if the net namespace is no longer live.

In the Linux kernel, a fix was made in the Tegra crypto driver to return ENOMEM when input buffer allocation fails for ccm. The fix ensures the ENOMEM error value is set when the allocation fails in tegra_ccm_do_one_req.

In the Linux kernel, a fix was made in the OCFS2 filesystem regarding buffer head management in ocfs2_read_blocks(). The fix clarifies that the caller should not assume that the buffer head returned by sb_getblk() is exclusively owned and that put_bh() always drops b_count from 1 to 0. To avoid a scenario where a buffer head remains on hold and may be returned with BH_Uptodate set despite previous validation failure, BH_Uptodate is now cleared immediately after the validate() callback detects data inconsistency.

In the Linux kernel, the IB/mlx5 driver has a vulnerability related to implicit ODP and rereg_mr operation. Due to child mkeys in the implicit ODP configuration, nothing can be changed in place for the parent mkey, so the whole structure must be rebuilt. Additionally, a race condition involving access to mr->pd by child keys was removed.

A circular locking dependency was found in the Linux kernel's OCFS2 filesystem during direct I/O write completion. The ocfs2_dio_end_io_write function could deadlock due to improper lock ordering involving system inodes (INODE_ALLOC, EXTENT_ALLOC, ORPHAN_DIR). The fix releases allocation contexts before acquiring the ORPHAN_DIR lock.

In the Linux kernel, the AFS filesystem has a memory leak related to the vllist in afs_update_cell(). When the new list is empty (nr_servers == 0), the old list is not replaced, leading to a leak of the new list.

A vulnerability was found in the Linux kernel's ring buffer mechanism used by ftrace. When RB_FORCE_8BYTE_ALIGNMENT is enabled (e.g., on riscv64 with CONFIG_HAVE_64BIT_ALIGNED_ACCESS), ring_buffer_event_length() incorrectly calculates the length of small events, reporting a data length 4 bytes larger than expected. This causes inconsistent results in ftrace tests (trace_marker_raw).