Description
In the Linux kernel, the following vulnerability has been resolved:
loop: Fix use-after-free issues
do_req_filebacked() calls blk_mq_complete_request() synchronously or
asynchronously when using asynchronous I/O unless memory allocation fails.
Hence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor
'rq' after do_req_filebacked() finished unless we are sure that the request
has not yet been completed. This patch fixes the following kernel crash:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054
Call trace:
css_put.42938+0x1c/0x1ac
loop_process_work+0xc8c/0xfd4
loop_rootcg_workfn+0x24/0x34
process_one_work+0x244/0x558
worker_thread+0x400/0x8fc
kthread+0x16c/0x1e0
ret_from_fork+0x10/0x20
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 4.4 | 5.10.273 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.1.25-1 | — |
| Debian 13 | linux | 6.1.25-1 | — |
| Debian 12 | linux | 6.1.25-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1022.24 | — |
| Ubuntu 24.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 22.04 LTS | linux | 5.15.0-79.86 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1042.47 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1045.52 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1045.52.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1039.47 | — |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1039.44 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1025.30 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1035.38 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1037.42 | — |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-79.88 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1030.30 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1016.16 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1002.2 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1040.46 | — |
| Ubuntu 22.04 LTS | linux-riscv +31 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1041.46~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1045.52~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1039.47~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-79.86~20.04.2 | — |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1036.39~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1037.42~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-79.88~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1016.16~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1040.46~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1038.42~20.04.2 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1036.38 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1043.48 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux +10 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux +12 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | linux +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws +2 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.110.1 | SUSE-SU-2025:02173-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.110.1.150500.6.51.3 | SUSE-SU-2025:02173-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.110.1.150500.6.51.3 | SUSE-SU-2025:02173-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.110.1 | SUSE-SU-2025:02173-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.110.1.150500.6.51.3 | SUSE-SU-2025:02173-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.97.1 | SUSE-SU-2025:01966-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.110.1 | SUSE-SU-2025:02173-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.121.1 | SUSE-SU-2025:01918-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.121.1 | SUSE-SU-2025:01918-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.110.1 | SUSE-SU-2025:02173-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_27 | 1-150500.11.7.1 | SUSE-SU-2025:02173-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_41 | 1-150400.9.3.1 | SUSE-SU-2025:02262-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.110.1 | SUSE-SU-2025:02173-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.110.1.150500.6.51.3 | SUSE-SU-2025:02173-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
| SUSE Manager Server 4.3 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
| SUSE Manager Server 4.3 | kernel-syms +3 | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
| SUSE Manager Proxy 4.3 | kernel-default-base | 5.14.21-150400.24.167.1.150400.24.84.1 | SUSE-SU-2025:02262-1 |
| SUSE Manager Proxy 4.3 | kernel-syms +2 | 5.14.21-150400.24.167.1 | SUSE-SU-2025:02262-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.21-1.45 | 1.0-0.amzn2023 | ALAS2023-2023-148 |
| Amazon Linux 2023 | perf +12 | 6.1.21-1.45.amzn2023 | ALAS2023-2023-148 |
Advisories 6
- WID-SEC-2025-0932 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 22, 2026
- SUSE-SU-2025:02262-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01918-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02173-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01966-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2023-2023-148 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 22, 2025
References
- https://git.kernel.org/stable/c/81bf9d78fa246a166619196ff5005430ed2bc7c2
- https://git.kernel.org/stable/c/407badf73ec9fb0d5744bf2ca1745c1818aa222f
- https://git.kernel.org/stable/c/e3fda704903f6d1fc351412f1bc6620333959ada
- https://git.kernel.org/stable/c/6917395c4667cfb607ed8bf1826205a59414657c
- https://git.kernel.org/stable/c/9b0cb770f5d7b1ff40bea7ca385438ee94570eec