CVE-2022-50084
In the Linux kernel, the following vulnerability has been resolved: dm raid: fix address sanitizer warning in raid_status There is this warning when using a kernel with the address sanitizer and running this testsuite:…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: dm raid: fix address sanitizer warning in raid_status There is this warning when using a kernel with the address sanitizer and running this testsuite: https://gitlab.com/cki-project/kernel-tests/-/tree/main/storage/swraid/scsi_raid ================================================================== BUG: KASAN: slab-out-of-bounds in raid_status+0x1747/0x2820 [dm_raid] Read of size 4 at addr ffff888079d2c7e8 by task lvcreate/13319 CPU: 0 PID: 13319 Comm: lvcreate Not tainted 5.18.0-0.rc3.<snip> #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Call Trace: <TASK> dump_stack_lvl+0x6a/0x9c print_address_description.constprop.0+0x1f/0x1e0 print_report.cold+0x55/0x244 kasan_report+0xc9/0x100 raid_status+0x1747/0x2820 [dm_raid] dm_ima_measure_on_table_load+0x4b8/0xca0 [dm_mod] table_load+0x35c/0x630 [dm_mod] ctl_ioctl+0x411/0x630 [dm_mod] dm_ctl_ioctl+0xa/0x10 [dm_mod] __x64_sys_ioctl+0x12a/0x1a0 do_syscall_64+0x5b/0x80 The warning is caused by reading conf->max_nr_stripes in raid_status. The code in raid_status reads mddev->private, casts it to struct r5conf and reads the entry max_nr_stripes. However, if we have different raid type than 4/5/6, mddev->private doesn't point to struct r5conf; it may point to struct r0conf, struct r1conf, struct r10conf or struct mpconf. If we cast a pointer to one of these structs to struct r5conf, we will be reading invalid memory and KASAN warns about it. Fix this bug by reading struct r5conf only if raid type is 4, 5 or 6.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1ae0ebfb576b72c2ef400917a5484ebe7892d80bPatch
- https://git.kernel.org/stable/c/1fbeea217d8f297fe0e0956a1516d14ba97d0396Patch
- https://git.kernel.org/stable/c/49dba30638e091120256a9e89125340795f034dcPatch
- https://git.kernel.org/stable/c/4c233811a49578634d10a5e70a9dfa569d451e94Patch
- https://git.kernel.org/stable/c/90b006da40dd42285b24dd3c940d2c32aca9a70bPatch
- https://git.kernel.org/stable/c/b4c6c07c92b6cba2bf3cb2dfa722debeaf8a8abePatch
- https://git.kernel.org/stable/c/b856ce5f4b55f752144baf17e9d5c415072652c5Patch
- https://git.kernel.org/stable/c/cb583ca6125ac64c98e9d65128e95ebb5be7d322Patch
- https://git.kernel.org/stable/c/d8971b595d7adac3421c21f59918241f1574061ePatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.