In the Linux kernel, the following vulnerability has been resolved:
udf: Avoid double brelse() in udf_rename()
syzbot reported a warning like below [1]:
VFS: brelse: Trying to free free buffer WARNING: CPU: 2 PID: 7301 at fs/buffer.c:1145 __brelse+0x67/0xa0 ... Call Trace: <TASK> invalidate_bh_lru+0x99/0x150 smp_call_function_many_cond+0xe2a/0x10c0 ? generic_remap_file_range_prep+0x50/0x50 ? __brelse+0xa0/0xa0 ? __mutex_lock+0x21c/0x12d0 ? smp_call_on_cpu+0x250/0x250 ? rcu_read_lock_sched_held+0xb/0x60 ? lock_release+0x587/0x810 ? __brelse+0xa0/0xa0 ? generic_remap_file_range_prep+0x50/0x50 on_each_cpu_cond_mask+0x3c/0x80 blkdev_flush_mapping+0x13a/0x2f0 blkdev_put_whole+0xd3/0xf0 blkdev_put+0x222/0x760 deactivate_locked_super+0x96/0x160 deactivate_super+0xda/0x100 cleanup_mnt+0x222/0x3d0 task_work_run+0x149/0x240 ? task_work_cancel+0x30/0x30 do_exit+0xb29/0x2a40 ? reacquire_held_locks+0x4a0/0x4a0 ? do_raw_spin_lock+0x12a/0x2b0 ? mm_update_next_owner+0x7c0/0x7c0 ? rwlock_bug.part.0+0x90/0x90 ? zap_other_threads+0x234/0x2d0 do_group_exit+0xd0/0x2a0 __x64_sys_exit_group+0x3a/0x50 do_syscall_64+0x34/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd
The cause of the issue is that brelse() is called on both ofibh.sbh and ofibh.ebh by udf_find_entry() when it returns NULL. However, brelse() is called by udf_rename(), too. So, b_count on buffer_head becomes unbalanced.
This patch fixes the issue by not calling brelse() by udf_rename() when udf_find_entry() returns NULL.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade kernel-headersUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-livepatch-5.15.86-53.137Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade perfUpgrade kernelUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.10.165-143.735Upgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-livepatch-4.14.304-226.531 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel-tools | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade bpftoolUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-abi-stablelists | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-ibm-5.4Upgrade linux-xilinx-zynqmpUpgrade linuxUpgrade linux-gcp-5.4Upgrade linux-iotUpgrade linux-oracleUpgrade linux-azure-fipsUpgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-gcpUpgrade linux-nvidiaUpgrade linux-gcp-5.15Upgrade linux-aws-fipsUpgrade linux-ibmUpgrade linux-gcp-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-gkeopUpgrade linux-gcp-4.15Upgrade linux-azure-5.4Upgrade linux-hwe-5.4Upgrade linux-hweUpgrade linux-azure-4.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracle-5.4Upgrade linux-lowlatencyUpgrade linux-hwe-5.15Upgrade linux-raspiUpgrade linux-fipsUpgrade linux-bluefieldUpgrade linux-azureUpgrade linux-riscv-5.15Upgrade linux-oracle-5.15Upgrade linux-aws-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-azure-fdeUpgrade linux-aws-5.15Upgrade linux-raspi-5.4Upgrade linux-aws-hweUpgrade linux-realtimeUpgrade linux-intel-iotgUpgrade linux-gke | Jan 6, 2026 | Dec 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 24, 2025 |
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