cbcvebase.
CVE-2024-50279
published 2024-11-19

CVE-2024-50279: In the Linux kernel, the following vulnerability has been resolved: dm cache: fix out-of-bounds access to the dirty bitset when resizing dm-cache checks the…

PriorityP429high7.1CVSS 3.1
AVLACLPRLUINSUCHINAH
EPSS
0.26%
17.9th percentile
In the Linux kernel, the following vulnerability has been resolved: dm cache: fix out-of-bounds access to the dirty bitset when resizing dm-cache checks the dirty bits of the cache blocks to be dropped when shrinking the fast device, but an index bug in bitset iteration causes out-of-bounds access. Reproduce steps: 1. create a cache device of 1024 cache blocks (128 bytes dirty bitset) dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" 2. shrink the fast device to 512 cache blocks, triggering out-of-bounds access to the dirty bitset (offset 0x80) dmsetup suspend cache dmsetup reload cdata --table "0 65536 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in cache_preresume+0x269/0x7b0 Read of size 8 at addr ffffc900000f3080 by task dmsetup/131 (...snip...) The buggy address belongs to the virtual mapping at [ffffc900000f3000, ffffc900000f5000) created by: cache_ctr+0x176a/0x35f0 (...snip...) Memory state around the buggy address: ffffc900000f2f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900000f3000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900000f3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc900000f3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900000f3180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 Fix by making the index post-incremented.

Affected

32 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.119-1 (bookworm)linux 6.1.119-1 (bookworm)
debianlinux-6.1< linux 6.1.119-1 (bookworm)linux 6.1.119-1 (bookworm)
linuxlinux
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 4fa4feb873cea0e9d6ff883b37cca6f33169d8b44fa4feb873cea0e9d6ff883b37cca6f33169d8b4
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 8501e38dc9e0060814c4085815fc83da3e6d43bf8501e38dc9e0060814c4085815fc83da3e6d43bf
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < ee1f74925717ab36f6a091104c170639501ce818ee1f74925717ab36f6a091104c170639501ce818
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7fff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 56507203e1b6127967ec2b51fb0b23a0d4af133456507203e1b6127967ec2b51fb0b23a0d4af1334
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < e57648ce325fa405fe6bbd0e6a618ced7c301a2de57648ce325fa405fe6bbd0e6a618ced7c301a2d
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 3b02c40ff10fdf83cc545850db208de855ebe22c3b02c40ff10fdf83cc545850db208de855ebe22c
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 792227719725497ce10a8039803bec13f89f8910792227719725497ce10a8039803bec13f89f8910
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.234-15.10.234-1
linuxlinux_kernel>= 0 < 6.1.119-16.1.119-1
linuxlinux_kernel>= 0 < 6.11.9-16.11.9-1
linuxlinux_kernel>= 0 < 6.11.9-16.11.9-1
linuxlinux_kernel>= 0 < 5.4.0-208.2285.4.0-208.228
linuxlinux_kernel>= 0 < 5.15.0-133.1445.15.0-133.144
linuxlinux_kernel>= 0 < 6.8.0-58.606.8.0-58.60
linuxlinux_kernel>= 0 < 6.11.0-18.186.11.0-18.18
linuxlinux_kernel>= 3.13 < 4.19.3244.19.324
linuxlinux_kernel>= 4.20 < 5.4.2865.4.286
linuxlinux_kernel>= 5.11 < 5.15.1725.15.172
linuxlinux_kernel>= 5.16 < 6.1.1176.1.117
linuxlinux_kernel>= 5.5 < 5.10.2305.10.230

CVSS provenance

nvdv3.17.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian7.1HIGH
vendor_msrc7.1HIGH
vendor_redhat7.1HIGH
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