In the Linux kernel, the following vulnerability has been resolved:
ubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed
Following process will trigger an infinite loop in ubi_wl_put_peb():
ubifs_bgt ubi_bgt ubifs_leb_unmap ubi_leb_unmap ubi_eba_unmap_leb ubi_wl_put_peb wear_leveling_worker e1 = rb_entry(rb_first(&ubi->used) e2 = get_peb_for_wl(ubi) ubi_io_read_vid_hdr // return err (flash fault) out_error: ubi->move_from = ubi->move_to = NULL wl_entry_destroy(ubi, e1) ubi->lookuptbl[e->pnum] = NULL retry: e = ubi->lookuptbl[pnum]; // return NULL if (e == ubi->move_from) { // NULL == NULL gets true goto retry; // infinite loop !!!
$ top PID USER PR NI VIRT RES SHR S %CPU %MEM COMMAND 7676 root 20 0 0 0 0 R 100.0 0.0 ubifs_bgt0_0
Fix it by: 1) Letting ubi_wl_put_peb() returns directly if wearl leveling entry has been removed from 'ubi->lookuptbl'. 2) Using 'ubi->wl_lock' protecting wl entry deletion to preventing an use-after-free problem for wl entry in ubi_wl_put_peb().
Fetch a reproducer in [Link].
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-headersUpgrade python-perfUpgrade kernel-livepatch-5.10.173-154.642Upgrade python-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-develUpgrade bpftoolUpgrade perf-debuginfoUpgrade perfUpgrade kernel-livepatch-4.14.309-231.529 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Oct 3, 2025 | Oct 3, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernelUpgrade python3-perfUpgrade kernel-abi-stablelists | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 1, 2025 |
| Ubuntu | — | Upgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.15Upgrade linux-gkeUpgrade linux-oracleUpgrade linux-aws-5.15Upgrade linux-hwe-5.15Upgrade linux-kvmUpgrade linux-nvidia-tegra-5.15Upgrade linux-oracle-5.4Upgrade linux-azure-5.4Upgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-azure-fdeUpgrade linux-xilinx-zynqmpUpgrade linux-iotUpgrade linux-bluefieldUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-azureUpgrade linux-aws-5.4Upgrade linux-realtimeUpgrade linux-aws-fipsUpgrade linux-azure-5.15Upgrade linux-ibm-5.15Upgrade linux-gcpUpgrade linux-intel-iotgUpgrade linux-gcp-fipsUpgrade linux-raspi-5.4Upgrade linux-hwe-5.4Upgrade linux-ibm-5.4Upgrade linux-gcp-5.4Upgrade linux-ibmUpgrade linux-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-awsUpgrade linuxUpgrade linux-gkeopUpgrade linux-azure-fipsUpgrade linux-nvidia-tegra-igxUpgrade linux-riscv-5.15Upgrade linux-nvidiaUpgrade linux-nvidia-tegra | Oct 10, 2025 | Oct 1, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Oct 1, 2025 |
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