In the Linux kernel, the following vulnerability has been resolved:
erofs: stop parsing non-compact HEAD index if clusterofs is invalid
Syzbot generated a crafted image [1] with a non-compact HEAD index of clusterofs 33024 while valid numbers should be 0 ~ lclustersize-1, which causes the following unexpected behavior as below:
BUG: unable to handle page fault for address: fffff52101a3fff9 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 23ffed067 P4D 23ffed067 PUD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4398 Comm: kworker/u5:1 Not tainted 6.3.0-rc6-syzkaller-g09a9639e56c0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: erofs_worker z_erofs_decompressqueue_work RIP: 0010:z_erofs_decompress_queue+0xb7e/0x2b40 ... Call Trace: <TASK> z_erofs_decompressqueue_work+0x99/0xe0 process_one_work+0x8f6/0x1170 worker_thread+0xa63/0x1210 kthread+0x270/0x300 ret_from_fork+0x1f/0x30
Note that normal images or images using compact indexes are not impacted. Let's fix this now.
[1] https://lore.kernel.org/r/[email protected]
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-abi-stablelists | Mar 10, 2026 | Mar 10, 2026 |
| Ubuntu | — | Upgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-riscv-5.15Upgrade linux-hwe-5.15Upgrade linux-gkeopUpgrade linux-oracle-5.15Upgrade linux-lowlatencyUpgrade linux-fipsUpgrade linux-ibmUpgrade linux-xilinx-zynqmpUpgrade linux-gcpUpgrade linux-gcp-5.4Upgrade linux-gcp-fipsUpgrade linux-kvmUpgrade linux-azureUpgrade linux-nvidiaUpgrade linux-nvidia-tegra-igxUpgrade linux-intel-iot-realtimeUpgrade linux-realtimeUpgrade linux-aws-fipsUpgrade linux-intel-iotgUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-azure-fipsUpgrade linux-azure-5.4Upgrade linux-hwe-5.4Upgrade linux-gkeUpgrade linux-oracle-5.4Upgrade linux-raspiUpgrade linux-iotUpgrade linux-awsUpgrade linuxUpgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.4Upgrade linux-raspi-5.4Upgrade linux-nvidia-tegraUpgrade linux-ibm-5.15Upgrade linux-aws-5.15Upgrade linux-aws-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-bluefield | 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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