In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to drop all dirty pages during umount() if cp_error is set
xfstest generic/361 reports a bug as below:
f2fs_bug_on(sbi, sbi->fsync_node_num);
kernel BUG at fs/f2fs/super.c:1627! RIP: 0010:f2fs_put_super+0x3a8/0x3b0 Call Trace: generic_shutdown_super+0x8c/0x1b0 kill_block_super+0x2b/0x60 kill_f2fs_super+0x87/0x110 deactivate_locked_super+0x39/0x80 deactivate_super+0x46/0x50 cleanup_mnt+0x109/0x170 __cleanup_mnt+0x16/0x20 task_work_run+0x65/0xa0 exit_to_user_mode_prepare+0x175/0x190 syscall_exit_to_user_mode+0x25/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc
During umount(), if cp_error is set, f2fs_wait_on_all_pages() should not stop waiting all F2FS_WB_CP_DATA pages to be writebacked, otherwise, fsync_node_num can be non-zero after f2fs_wait_on_all_pages() causing this bug.
In this case, to avoid deadloop in f2fs_wait_on_all_pages(), it needs to drop all dirty pages rather than redirtying them.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Ubuntu | — | Upgrade linux-lowlatencyUpgrade linux-ibm-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-raspi-5.4Upgrade linux-gcpUpgrade linux-raspiUpgrade linux-oracle-5.4Upgrade linuxUpgrade linux-aws-5.15Upgrade linux-bluefieldUpgrade linux-fipsUpgrade linux-awsUpgrade linux-nvidia-tegraUpgrade linux-ibm-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-gkeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-aws-5.4Upgrade linux-riscv-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-realtimeUpgrade linux-hwe-5.4Upgrade linux-nvidiaUpgrade linux-oracleUpgrade linux-azureUpgrade linux-iotUpgrade linux-azure-5.4Upgrade linux-nvidia-tegra-igxUpgrade linux-azure-5.15Upgrade linux-gkeopUpgrade linux-ibmUpgrade linux-azure-fdeUpgrade linux-oracle-5.15Upgrade linux-hwe-5.15Upgrade linux-gcp-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-gcp-fipsUpgrade linux-azure-fipsUpgrade linux-aws-fipsUpgrade linux-intel-iotg | 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 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub