In the Linux kernel, the following vulnerability has been resolved:
ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()
Wear-leveling entry could be freed in error path, which may be accessed again in eraseblk_count_seq_show(), for example:
__erase_worker eraseblk_count_seq_show wl = ubi->lookuptbl[*block_number] if (wl) wl_entry_destroy ubi->lookuptbl[e->pnum] = NULL kmem_cache_free(ubi_wl_entry_slab, e) erase_count = wl->ec // UAF!
Wear-leveling entry updating/accessing in ubi->lookuptbl should be protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize wl entry accessing between wl_entry_destroy() and eraseblk_count_seq_show().
Fetch a reproducer in [Link].
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-4.14.309-231.529Upgrade python-perf-debuginfoUpgrade kernel-livepatch-5.10.173-154.642Upgrade kernel-tools-develUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-toolsUpgrade python-perfUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade perf | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Dec 10, 2025 | Dec 10, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernelUpgrade kernel-abi-stablelists | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 9, 2025 |
| Ubuntu | — | Upgrade linux-gkeopUpgrade linux-azure-5.4Upgrade linux-gcp-5.4Upgrade linux-azure-fipsUpgrade linux-nvidiaUpgrade linux-kvmUpgrade linux-xilinx-zynqmpUpgrade linux-oracle-5.15Upgrade linux-nvidia-tegra-igxUpgrade linuxUpgrade linux-fipsUpgrade linux-lowlatencyUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-gcp-fipsUpgrade linux-ibm-5.4Upgrade linux-aws-fipsUpgrade linux-oracleUpgrade linux-intel-iotgUpgrade linux-gcp-5.15Upgrade linux-hwe-5.4Upgrade linux-aws-5.4Upgrade linux-riscv-5.15Upgrade linux-ibmUpgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-ibm-5.15Upgrade linux-awsUpgrade linux-gcpUpgrade linux-azureUpgrade linux-intel-iot-realtimeUpgrade linux-bluefieldUpgrade linux-lowlatency-hwe-5.15Upgrade linux-oracle-5.4Upgrade linux-nvidia-tegraUpgrade linux-iotUpgrade linux-realtimeUpgrade linux-raspi-5.4Upgrade linux-raspiUpgrade linux-aws-5.15Upgrade linux-nvidia-tegra-5.15 | Dec 11, 2025 | Dec 9, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 9, 2025 |
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