In the Linux kernel, the following vulnerability has been resolved:
loop: Avoid updating block size under exclusive owner
Syzbot came up with a reproducer where a loop device block size is changed underneath a mounted filesystem. This causes a mismatch between the block device block size and the block size stored in the superblock causing confusion in various places such as fs/buffer.c. The particular issue triggered by syzbot was a warning in __getblk_slow() due to requested buffer size not matching block device block size.
Fix the problem by getting exclusive hold of the loop device to change its block size. This fails if somebody (such as filesystem) has already an exclusive ownership of the block device and thus prevents modifying the loop device under some exclusive owner which doesn't expect it.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12Upgrade kernel6.12-modules-extraUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-libbpf-develUpgrade bpftool6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade bpftool6.12-debuginfoUpgrade perf6.12-debuginfoUpgrade kernel-livepatch-6.12.46-66.121Upgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-tools-develUpgrade perf6.12Upgrade kernel6.12-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.12-headersUpgrade kernel6.12-tools-debuginfoUpgrade python3-perf6.12Upgrade kernel6.12-develUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12-libbpfUpgrade kernel6.12-libbpf-static | Sep 30, 2025 | Sep 4, 2025 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernelUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernel-tools-libs | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp11 | — | Upgrade python3-perfUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftool | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp12 | — | Upgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools | Feb 3, 2026 | Jan 13, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Oct 16, 2025 | Sep 4, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 4, 2025 |
| Suse | — | Upgrade reiserfs-kmp-64kbUpgrade kernel-azure-develUpgrade ocfs2-kmp-azureUpgrade kernel-rt-vdsoUpgrade kselftests-kmp-64kbUpgrade kernel-64kb-extraUpgrade ocfs2-kmp-defaultUpgrade kernel-default-vdsoUpgrade kernel-kvmsmall-vdsoUpgrade kselftests-kmp-azureUpgrade kernel-rt-optionalUpgrade kernel-default-base-rebuildUpgrade kernel-sourceUpgrade kernel-source-azureUpgrade dtb-marvellUpgrade kernel-default-develUpgrade kernel-rt-extraUpgrade kernel-rt_debug-develUpgrade dlm-kmp-rtUpgrade kernel-source-rtUpgrade dlm-kmp-64kbUpgrade kernel-defaultUpgrade dtb-broadcomUpgrade kernel-obs-buildUpgrade dtb-amazonUpgrade kernel-rtUpgrade kernel-default-livepatchUpgrade kernel-default-livepatch-develUpgrade dtb-allwinnerUpgrade kernel-rt_debugUpgrade gfs2-kmp-defaultUpgrade kernel-source-vanillaUpgrade gfs2-kmp-azureUpgrade dtb-exynosUpgrade dtb-sprdUpgrade kernel-azureUpgrade dtb-lgUpgrade ocfs2-kmp-64kbUpgrade kernel-default-baseUpgrade dtb-appleUpgrade kernel-debug-vdsoUpgrade dtb-caviumUpgrade cluster-md-kmp-64kbUpgrade kernel-azure-extraUpgrade kernel-azure-optionalUpgrade dtb-nvidiaUpgrade dtb-alteraUpgrade dtb-freescaleUpgrade dtb-rockchipUpgrade dtb-socionextUpgrade kernel-docs-htmlUpgrade dlm-kmp-azureUpgrade dtb-apmUpgrade kernel-rt-livepatch-develUpgrade kernel-obs-qaUpgrade kernel-devel-rtUpgrade dtb-armUpgrade dtb-amlogicUpgrade cluster-md-kmp-defaultUpgrade reiserfs-kmp-defaultUpgrade dlm-kmp-defaultUpgrade reiserfs-kmp-rtUpgrade dtb-renesasUpgrade kernel-syms-rtUpgrade cluster-md-kmp-azureUpgrade kselftests-kmp-rtUpgrade kernel-develUpgrade kernel-rt_debug-vdsoUpgrade kernel-default-extraUpgrade kernel-debugUpgrade kernel-azure-vdsoUpgrade kernel-kvmsmallUpgrade kernel-kvmsmall-develUpgrade kernel-devel-azureUpgrade kernel-64kb-optionalUpgrade kselftests-kmp-defaultUpgrade kernel-debug-develUpgrade kernel-64kb-develUpgrade kernel-64kbUpgrade ocfs2-kmp-rtUpgrade kernel-macrosUpgrade dtb-xilinxUpgrade dtb-mediatekUpgrade reiserfs-kmp-azureUpgrade kernel-rt-develUpgrade dtb-amdUpgrade kernel-zfcpdumpUpgrade dtb-hisiliconUpgrade cluster-md-kmp-rtUpgrade kernel-default-optionalUpgrade dtb-qcomUpgrade gfs2-kmp-64kbUpgrade kernel-docsUpgrade kernel-symsUpgrade gfs2-kmp-rtUpgrade kernel-syms-azureUpgrade kernel-rt-livepatch | Dec 5, 2025 | Oct 15, 2025 |
| Ubuntu | — | Upgrade linux-image-oem-22.04dUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-oem-22.04aUpgrade linux-image-oracle-64kUpgrade linux-image-raspi-6.8Upgrade linux-image-6.8.0-1048-gke-64kUpgrade linux-image-6.8.0-106-fipsUpgrade linux-image-azureUpgrade linux-image-6.8.0-106-lowlatency-64kUpgrade linux-image-6.8.0-1049-nvidia-lowlatency-64kUpgrade linux-image-gke-64kUpgrade linux-image-realtime-6.8.1Upgrade linux-image-gke-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-raspiUpgrade linux-image-6.8.0-106-lowlatencyUpgrade linux-image-oracle-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-2040-raspi-realtimeUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-azure-fipsUpgrade linux-image-ibmUpgrade linux-image-gcp-64kUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-xilinx-6.8Upgrade linux-image-6.8.0-1029-xilinxUpgrade linux-image-gcp-fipsUpgrade linux-image-lowlatencyUpgrade linux-image-nvidiaUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-6.8.0-106-genericUpgrade linux-image-gke-64k-6.8Upgrade linux-image-aws-fipsUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-6.8.0-1052-azure-fipsUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1051-azureUpgrade linux-image-ibm-classicUpgrade linux-image-oracle-64k-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-virtual-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-intel-iotgUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1052-gcp-64kUpgrade linux-image-6.8.0-1035-gkeopUpgrade linux-image-aws-6.8Upgrade linux-image-oem-22.04cUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-gkeopUpgrade linux-image-6.8.0-1049-ibmUpgrade linux-image-nvidia-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-generic-64kUpgrade linux-image-genericUpgrade linux-image-6.8.0-1049-nvidiaUpgrade linux-image-6.8.0-1047-oracle-64kUpgrade linux-image-oem-22.04bUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-realtimeUpgrade linux-image-aws-fips-6.8Upgrade linux-image-aws-64k-6.8Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-6.8.0-106-generic-64kUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1052-gcpUpgrade linux-image-6.8.0-1048-gkeUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.8.0-1050-aws-64kUpgrade linux-image-ibm-6.8Upgrade linux-image-generic-6.8Upgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-kvmUpgrade linux-image-fipsUpgrade linux-image-gcp-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1049-nvidia-64kUpgrade linux-image-6.8.1-1045-realtimeUpgrade linux-image-fips-6.8Upgrade linux-image-6.8.0-1049-nvidia-lowlatencyUpgrade linux-image-azure-6.8Upgrade linux-image-6.8.0-1050-awsUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1047-oracleUpgrade linux-image-oracleUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-azure-fips-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-aws-64kUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-xilinxUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-raspi-realtimeUpgrade linux-image-gkeUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1052-gcp-fipsUpgrade linux-image-6.8.0-1050-raspiUpgrade linux-image-6.8.0-1050-aws-fips | Mar 17, 2026 | Sep 4, 2025 |
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