CVE-2022-49010

Summary

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' <cpu offline> [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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < fb503d077ff7b43913503eaf72995d1239028b99affected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < 070d5ea4a0592a37ad96ce7f7b6b024f90bb009faffected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < 280110db1a7d62ad635b103bafc3ae96e8bef75caffected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < 89eecabe6a47403237f45aafd7d24f93cb973653affected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < f06e0cd01eab954bd5f2190c9faa79bb5357e05baffected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < 7692700ac818866d138a8de555130a6e70e6ac16affected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < ae6c8b6e5d5628df1c475c0a8fca1465e205c95baffected
LinuxLinux199e0de7f5df31a4fc485d4aaaf8a07718252ace < a89ff5f5cc64b9fe7a992cf56988fd36f56ca82aaffected
LinuxLinux3.0affected
LinuxLinux0 < 3.0unaffected
LinuxLinux4.9.335 <= 4.9.*unaffected
LinuxLinux4.14.301 <= 4.14.*unaffected
LinuxLinux4.19.268 <= 4.19.*unaffected
LinuxLinux5.4.226 <= 5.4.*unaffected
LinuxLinux5.10.158 <= 5.10.*unaffected
LinuxLinux5.15.82 <= 5.15.*unaffected
LinuxLinux6.0.12 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References