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CVE-2025-38066 — dm cache: prevent BUG_ON by blocking retries on failed device resumes

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

dm cache: prevent BUG_ON by blocking retries on failed device resumes

A cache device failing to resume due to mapping errors should not be retried, as the failure leaves a partially initialized policy object. Repeating the resume operation risks triggering BUG_ON when reloading cache mappings into the incomplete policy object.

Reproduce steps:

1. create a cache metadata consisting of 512 or more cache blocks, with some mappings stored in the first array block of the mapping array. Here we use cache_restore v1.0 to build the metadata.

cat <<EOF >> cmeta.xml <superblock uuid="" block_size="128" nr_cache_blocks="512" \ policy="smq" hint_width="4"> <mappings> <mapping cache_block="0" origin_block="0" dirty="false"/> </mappings> </superblock> EOF dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" cache_restore -i cmeta.xml -o /dev/mapper/cmeta --metadata-version=2 dmsetup remove cmeta

2. wipe the second array block of the mapping array to simulate data degradations.

mapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \ 2>/dev/null | hexdump -e '1/8 "%u\n"') ablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \ 2>/dev/null | hexdump -e '1/8 "%u\n"') dd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock

3. try bringing up the cache device. The resume is expected to fail due to the broken array block.

dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmset…

USN-7704-1 — linux, linux-aws, linux-aws-5.15, linux-gcp, linux-gcp-5.15, linux-gkeop, linux-hwe-5.15, linux-ibm-5.15, linux-intel-i…

Affected: Ubuntu:Pro:20.04:LTS: linux-aws-5.15, Ubuntu:Pro:20.04:LTS: linux-gcp-5.15, Ubuntu:Pro:20.04:LTS: linux-hwe-5.15, Ubuntu:Pro:20.04:LTS: linux-ibm-5.15, Ubuntu:Pro:20.04:LTS: linux-intel-iotg-5.15, Ubuntu:Pro:20.04:LTS: linux-lowlatency-hwe-5.15, Ubuntu:Pro:20.04:LTS: linux-nvidia-tegra-5.15, Ubuntu:Pro:20.04:LTS: linux-oracle-5.15, Ubuntu:22.04:LTS: linux, Ubuntu:22.04:LTS: linux-aws and 8 more

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - Arm Firmware Framework for ARMv8-A(FFA); - Multiple devices driver; - Media drivers; - Network drivers; - NVDIMM (Non-Volatile Memory Device) drivers; - NVME drivers; - x86 platform drivers; - TCM subsystem; - Virtio drivers; - File systems infrastructure; - SMB network file system; - LZO compression library; - Digital Audio (PCM) driver; - Tracing infrastructure; - Padata parallel execution mechanism; - CAN network layer; - Networking core; - TIPC protocol; - ALSA framework; (CVE-2025-38079, CVE-2025-38048, CVE-2025-38075, CVE-2025-38077, CVE-2025-38035, CVE-2025-38037, CVE-2025-38034, CVE-2025-38058, CVE-2025-38004, CVE-2025-38031, CVE-2025-38078, CVE-2025-38044, CVE-2025-38066, CVE-2025-38052, CVE-2025-38043, CVE-2025-38065, CVE-2025-38003, CVE-2025-38061, CVE-2025-38051, CVE-2025-38072, CVE-2025-38068)