CVE-2022-49010 Information

Description

In the Linux kernel the following vulnerability has been resolved:

hwmon: (coretemp) Check for null before removing sysfs attrs

If coretemp_add_core() gets an error then pdata->core_data[indx] is already NULL and has been kfreed. Don’t pass that to sysfs_remove_group() as that will crash in sysfs_remove_group().

[Shortened for readability] [91854.020159] sysfs: cannot create duplicate filename ‘/devices/platform/coretemp.0/hwmon/hwmon2/temp20_label’ [91855.126115] BUG: kernel NULL pointer dereference address: 0000000000000188 [91855.165103] PF: supervisor read access in kernel mode [91855.194506] PF: error_code(0x0000) - not-present page [91855.224445] PGD 0 P4D 0 [91855.238508] Oops: 0000 [1] PREEMPT SMP PTI … [91855.342716] RIP: 0010:sysfs_remove_group+0xc/0x80 … [91855.796571] Call Trace: [91855.810524] coretemp_cpu_offline+0x12b/0x1dd [coretemp] [91855.841738] ? coretemp_cpu_online+0x180/0x180 [coretemp] [91855.871107] cpuhp_invoke_callback+0x105/0x4b0 [91855.893432] cpuhp_thread_fun+0x8e/0x150 …

Fix this by checking for NULL first.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

https://git.kernel.org/stable/c/fb503d077ff7b43913503eaf72995d1239028b99 https://git.kernel.org/stable/c/070d5ea4a0592a37ad96ce7f7b6b024f90bb009f https://git.kernel.org/stable/c/280110db1a7d62ad635b103bafc3ae96e8bef75c https://git.kernel.org/stable/c/89eecabe6a47403237f45aafd7d24f93cb973653 https://git.kernel.org/stable/c/f06e0cd01eab954bd5f2190c9faa79bb5357e05b https://git.kernel.org/stable/c/7692700ac818866d138a8de555130a6e70e6ac16 https://git.kernel.org/stable/c/ae6c8b6e5d5628df1c475c0a8fca1465e205c95b https://git.kernel.org/stable/c/a89ff5f5cc64b9fe7a992cf56988fd36f56ca82a

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5