In the Linux kernel, the following vulnerability has been resolved:
ext4: don't BUG if someone dirty pages without asking ext4 first
[un]pin_user_pages_remote is dirtying pages without properly warning the file system in advance. A related race was noted by Jan Kara in 2018[1]; however, more recently instead of it being a very hard-to-hit race, it could be reliably triggered by process_vm_writev(2) which was discovered by Syzbot[2].
This is technically a bug in mm/gup.c, but arguably ext4 is fragile in that if some other kernel subsystem dirty pages without properly notifying the file system using page_mkwrite(), ext4 will BUG, while other file systems will not BUG (although data will still be lost).
So instead of crashing with a BUG, issue a warning (since there may be potential data loss) and just mark the page as clean to avoid unprivileged denial of service attacks until the problem can be properly fixed. More discussion and background can be found in the thread starting at [2].
[1] https://lore.kernel.org/linux-mm/[email protected] [2] https://lore.kernel.org/r/[email protected]
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.10.112-108.499Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-livepatch-4.14.276-211.499Upgrade python-perfUpgrade perfUpgrade kernel-tools-devel | Mar 14, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-tools | Jun 11, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernelUpgrade bpftoolUpgrade kernel-tools-libs | Jun 11, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-lowlatencyUpgrade linux-gcp-5.4Upgrade linux-fipsUpgrade linux-oracleUpgrade linux-aws-5.4Upgrade linux-intel-iotgUpgrade linux-bluefieldUpgrade linux-azure-fde-5.15Upgrade linux-kvmUpgrade linux-gkeUpgrade linux-azure-5.15Upgrade linux-aws-fipsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcpUpgrade linux-aws-hweUpgrade linux-oracle-5.4Upgrade linux-ibmUpgrade linux-realtimeUpgrade linux-raspi-5.4Upgrade linux-gcp-4.15Upgrade linux-raspiUpgrade linux-gcp-fipsUpgrade linuxUpgrade linux-azure-5.4Upgrade linux-azure-4.15Upgrade linux-hwe-5.15Upgrade linux-azure-fipsUpgrade linux-azureUpgrade linux-awsUpgrade linux-hwe-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-iotUpgrade linux-hweUpgrade linux-ibm-5.4 | Mar 3, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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