Bug 1223893 (CVE-2022-48670)

Summary: VUL-0: CVE-2022-48670: kernel: peci: cpu: fix use-after-free in adev_release()
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: camila.matos, vasant.karasulli
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/404288/
Whiteboard: CVSSv3.1:SUSE:CVE-2022-48670:5.8:(AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-05-03 19:43:58 UTC 
In the Linux kernel, the following vulnerability has been resolved:

peci: cpu: Fix use-after-free in adev_release()

When auxiliary_device_add() returns an error, auxiliary_device_uninit()
is called, which causes refcount for device to be decremented and
.release callback will be triggered.

Because adev_release() re-calls auxiliary_device_uninit(), it will cause
use-after-free:
[ 1269.455172] WARNING: CPU: 0 PID: 14267 at lib/refcount.c:28 refcount_warn_saturate+0x110/0x15
[ 1269.464007] refcount_t: underflow; use-after-free.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-48670
https://www.cve.org/CVERecord?id=CVE-2022-48670
https://git.kernel.org/stable/c/1c11289b34ab67ed080bbe0f1855c4938362d9cf
https://git.kernel.org/stable/c/c87f1f99e26ea4ae08cabe753ae98e5626bdba89
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-48670.mbox
Comment 4 Takashi Iwai 2024-05-06 07:49:13 UTC 
CONFIG_PECI_CPU isn't enabled on SLE15-SP5 and older branches, hence unaffected.