cbcvebase.
CVE-2025-38066
published 2025-06-18

CVE-2025-38066: 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…

medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
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 > cmeta.xml 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" dmsetup create cdata --table "0 65536 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dmsetup create cache --notable dmsetup load cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" dmsetup resume cache 4. try resuming the cache again. An unexpected BUG_ON is triggered while loading cache mappings. dmsetup resume cache Kernel logs: (snip) ------------[ cut here ]------------ kernel BUG at drivers/md/dm-cache-policy-smq.c:752! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 332 Comm: dmsetup Not tainted 6.13.4 #3 RIP: 0010:smq_load_mapping+0x3e5/0x570 Fix by disallowin

Affected

35 ranges· showing 25
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
debianlinux-6.1< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
linuxlinux
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < c614584c2a66b538f469089ac089457a34590c14c614584c2a66b538f469089ac089457a34590c14
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < c5356a5e80442131e2714d0d26bb110590e4e568c5356a5e80442131e2714d0d26bb110590e4e568
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < 025c8f477625eb39006ded650e7d027bcfb20e79025c8f477625eb39006ded650e7d027bcfb20e79
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < 00586b78eeb7c626a14ca13453a1631f88a7cf3600586b78eeb7c626a14ca13453a1631f88a7cf36
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < 3986ef4a9b6a0d9c28bc325d8713beba5e67586f3986ef4a9b6a0d9c28bc325d8713beba5e67586f
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < cc80a5cc520939d0a7d071cc4ae4b3c55ef171d0cc80a5cc520939d0a7d071cc4ae4b3c55ef171d0
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < f3128e3074e8af565cc6a66fe3384a56df87f803f3128e3074e8af565cc6a66fe3384a56df87f803
linuxlinux>= 66a636356647a9be8885c2ce2948de126577698a < 5da692e2262b8f81993baa9592f57d12c2703dea5da692e2262b8f81993baa9592f57d12c2703dea
linuxlinux_kernel< 5.4.2945.4.294
linuxlinux_kernel>= 0 < 5.10.244-15.10.244-1
linuxlinux_kernel>= 0 < 6.1.147-16.1.147-1
linuxlinux_kernel>= 0 < 6.12.32-16.12.32-1
linuxlinux_kernel>= 0 < 6.12.32-16.12.32-1
linuxlinux_kernel>= 0 < 5.15.0-152.1625.15.0-152.162
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 5.11 < 5.15.1855.15.185
linuxlinux_kernel>= 5.16 < 6.1.1416.1.141
linuxlinux_kernel>= 5.5 < 5.10.2385.10.238
linuxlinux_kernel>= 6.13 < 6.14.96.14.9
linuxlinux_kernel>= 6.2 < 6.6.936.6.93
linuxlinux_kernel>= 6.7 < 6.12.316.12.31

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM