In the Linux kernel, the following vulnerability has been resolved:
writeback: avoid use-after-free after removing device
When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback.
Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work.
Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock.
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 kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernelUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-livepatch-5.15.69-37.134Upgrade bpftool-debuginfo | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Dell Powerstore Dsa2025429 | — | Upgrade Dell PowerStoreOS to the latest version | Dec 3, 2025 | Dec 2, 2025 |
| Dell Powerstore Dsa2026039 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Jan 6, 2026 |
| Redhat_linux | — | Upgrade kernelNo solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | Upgrade linux-nvidiaUpgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-azureUpgrade linux-aws-5.15Upgrade linux-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-oracleUpgrade linux-ibmUpgrade linux-oracle-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-gcp-5.15Upgrade linux-gkeopUpgrade linux-gkeUpgrade linux-awsUpgrade linux-gcpUpgrade linux-riscv-5.15Upgrade linux | Jun 26, 2025 | Jun 18, 2025 |
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