In the Linux kernel, the following vulnerability has been resolved:
ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline
When converting files with inline data to extents, delayed allocations made on a file system created with both the bigalloc and inline options can result in invalid extent status cache content, incorrect reserved cluster counts, kernel memory leaks, and potential kernel panics.
With bigalloc, the code that determines whether a block must be delayed allocated searches the extent tree to see if that block maps to a previously allocated cluster. If not, the block is delayed allocated, and otherwise, it isn't. However, if the inline option is also used, and if the file containing the block is marked as able to store data inline, there isn't a valid extent tree associated with the file. The current code in ext4_clu_mapped() calls ext4_find_extent() to search the non-existent tree for a previously allocated cluster anyway, which typically finds nothing, as desired. However, a side effect of the search can be to cache invalid content from the non-existent tree (garbage) in the extent status tree, including bogus entries in the pending reservation tree.
To fix this, avoid searching the extent tree when allocating blocks for bigalloc + inline files that are being converted from inline to extent mapped.
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 |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perfUpgrade bpftoolUpgrade kernel-tools-develUpgrade perfUpgrade kernel-develUpgrade kernel-toolsUpgrade kernel-livepatch-5.10.165-143.735Upgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernelUpgrade kernel-livepatch-5.15.90-54.138Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade bpftoolUpgrade python3-perfUpgrade kernel-tools-libs | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-azure-5.15Upgrade linux-azure-fipsUpgrade linux-aws-fipsUpgrade linux-oracleUpgrade linux-awsUpgrade linux-raspi-5.4Upgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linux-kvmUpgrade linux-azureUpgrade linux-gcp-5.4Upgrade linux-hwe-5.4Upgrade linux-azure-5.4Upgrade linux-iotUpgrade linux-nvidiaUpgrade linux-gkeopUpgrade linux-gcp-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-gcp-5.15Upgrade linux-gcpUpgrade linux-ibm-5.4Upgrade linux-oracle-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-gkeUpgrade linux-raspiUpgrade linux-nvidia-tegra-5.15Upgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-bluefieldUpgrade linux-hwe-5.15Upgrade linux-oracle-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-lowlatencyUpgrade linuxUpgrade linux-aws-5.4Upgrade linux-riscv-5.15Upgrade linux-realtime | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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