cbcvebase.
CVE-2024-50278
published 2024-11-19

CVE-2024-50278: In the Linux kernel, the following vulnerability has been resolved: dm cache: fix potential out-of-bounds access on the first resume Out-of-bounds access…

PriorityP431high7.1CVSS 3.1
AVLACLPRLUINSUCHINAH
EPSS
0.26%
17.9th percentile
In the Linux kernel, the following vulnerability has been resolved: dm cache: fix potential out-of-bounds access on the first resume Out-of-bounds access occurs if the fast device is expanded unexpectedly before the first-time resume of the cache table. This happens because expanding the fast device requires reloading the cache table for cache_create to allocate new in-core data structures that fit the new size, and the check in cache_preresume is not performed during the first resume, leading to the issue. Reproduce steps: 1. prepare component devices: 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" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct 2. load a cache table of 512 cache blocks, and deliberately expand the fast device before resuming the cache, making the in-core data structures inadequate. dmsetup create cache --notable dmsetup reload cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" dmsetup reload cdata --table "0 131072 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache 3. suspend the cache to write out the in-core dirty bitset and hint array, leading to out-of-bounds access to the dirty bitset at offset 0x40: dmsetup suspend cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80 Read of size 8 at addr ffffc90000085040 by task dmsetup/90 (...snip...) The buggy address belongs to the virtual mapping at [ffffc90000085000, ffffc90000087000) created by: cache_ctr+0x176a/0x35f0 (...snip...) Memory state around the buggy address: ffffc90000084f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90000084f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffffc90000085000: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90000085080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f

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 < e492f71854ce03474d49e87fd98b8df1f7cd1d2de492f71854ce03474d49e87fd98b8df1f7cd1d2d
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 2222b0929d00e2d13732b799b63be391b5de44922222b0929d00e2d13732b799b63be391b5de4492
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 483b7261b35a9d369082ab298a6670912243f0be483b7261b35a9d369082ab298a6670912243f0be
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < fdef3b94dfebd57e3077a578b6e309a2bb6fa688fdef3b94dfebd57e3077a578b6e309a2bb6fa688
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < c52ec00cb2f9bebfada22edcc0db385b910a1cdbc52ec00cb2f9bebfada22edcc0db385b910a1cdb
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 036dd6e3d2638103e0092864577ea1d091466b86036dd6e3d2638103e0092864577ea1d091466b86
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < 13ed3624c6ef283acefa4cc42cc8ae54fd4391a413ed3624c6ef283acefa4cc42cc8ae54fd4391a4
linuxlinux>= f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 < c0ade5d98979585d4f5a93e4514c2e9a65afa08dc0ade5d98979585d4f5a93e4514c2e9a65afa08d
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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