CVE-2023-52635

CVE Details

Release Date:

2024-04-02

Description

In the Linux kernel, the following vulnerability has been resolved:\nPM / devfreq: Synchronize devfreq_monitor_[start/stop]\nThere is a chance if a frequent switch of the governor\ndone in a loop result in timer list corruption where\ntimer cancel being done from two place one from\ncancel_delayed_work_sync() and followed by expire_timers()\ncan be seen from the traces[1].\nwhile true\ndo\necho 'simple_ondemand' > /sys/class/devfreq/1d84000.ufshc/governor\necho 'performance' > /sys/class/devfreq/1d84000.ufshc/governor\ndone\nIt looks to be issue with devfreq driver where\ndevice_monitor_[start/stop] need to synchronized so that\ndelayed work should get corrupted while it is either\nbeing queued or running or being cancelled.\nLet's use polling flag and devfreq lock to synchronize the\nqueueing the timer instance twice and work data being\ncorrupted.\n[1]\n...\n..\n-0 [003] 9436.209662: timer_cancel timer=0xffffff80444f0428\n-0 [003] 9436.209664: timer_expire_entry timer=0xffffff80444f0428 now=0x10022da1c function=__typeid__ZTSFvP10timer_listE_global_addr baseclk=0x10022da1c\n-0 [003] 9436.209718: timer_expire_exit timer=0xffffff80444f0428\nkworker/u16:6-14217 [003] 9436.209863: timer_start timer=0xffffff80444f0428 function=__typeid__ZTSFvP10timer_listE_global_addr expires=0x10022da2b now=0x10022da1c flags=182452227\nvendor.xxxyyy.ha-1593 [004] 9436.209888: timer_cancel timer=0xffffff80444f0428\nvendor.xxxyyy.ha-1593 [004] 9436.216390: timer_init timer=0xffffff80444f0428\nvendor.xxxyyy.ha-1593 [004] 9436.216392: timer_start timer=0xffffff80444f0428 function=__typeid__ZTSFvP10timer_listE_global_addr expires=0x10022da2c now=0x10022da1d flags=186646532\nvendor.xxxyyy.ha-1593 [005] 9436.220992: timer_cancel timer=0xffffff80444f0428\nxxxyyyTraceManag-7795 [004] 9436.261641: timer_cancel timer=0xffffff80444f0428\n[2]\n9436.261653][ C4] Unable to handle kernel paging request at virtual address dead00000000012a\n[ 9436.261664][ C4] Mem abort info:\n[ 9436.261666][ C4] ESR = 0x96000044\n[ 9436.261669][ C4] EC = 0x25: DABT (current EL), IL = 32 bits\n[ 9436.261671][ C4] SET = 0, FnV = 0\n[ 9436.261673][ C4] EA = 0, S1PTW = 0\n[ 9436.261675][ C4] Data abort info:\n[ 9436.261677][ C4] ISV = 0, ISS = 0x00000044\n[ 9436.261680][ C4] CM = 0, WnR = 1\n[ 9436.261682][ C4] [dead00000000012a] address between user and kernel address ranges\n[ 9436.261685][ C4] Internal error: Oops: 96000044 [#1] PREEMPT SMP\n[ 9436.261701][ C4] Skip md ftrace buffer dump for: 0x3a982d0\n...\n[ 9436.262138][ C4] CPU: 4 PID: 7795 Comm: TraceManag Tainted: G S W O 5.10.149-android12-9-o-g17f915d29d0c #1\n[ 9436.262141][ C4] Hardware name: Qualcomm Technologies, Inc. (DT)\n[ 9436.262144][ C4] pstate: 22400085 (nzCv daIf +PAN -UAO +TCO BTYPE=--)\n[ 9436.262161][ C4] pc : expire_timers+0x9c/0x438\n[ 9436.262164][ C4] lr : expire_timers+0x2a4/0x438\n[ 9436.262168][ C4] sp : ffffffc010023dd0\n[ 9436.262171][ C4] x29: ffffffc010023df0 x28: ffffffd0636fdc18\n[ 9436.262178][ C4] x27: ffffffd063569dd0 x26: ffffffd063536008\n[ 9436.262182][ C4] x25: 0000000000000001 x24: ffffff88f7c69280\n[ 9436.262185][ C4] x23: 00000000000000e0 x22: dead000000000122\n[ 9436.262188][ C4] x21: 000000010022da29 x20: ffffff8af72b4e80\n[ 9436.262191][ C4] x19: ffffffc010023e50 x18: ffffffc010025038\n[ 9436.262195][ C4] x17: 0000000000000240 x16: 0000000000000201\n[ 9436.262199][ C4] x15: ffffffffffffffff x14: ffffff889f3c3100\n[ 9436.262203][ C4] x13: ffffff889f3c3100 x12: 00000000049f56b8\n[ 9436.262207][ C4] x11: 00000000049f56b8 x10: 00000000ffffffff\n[ 9436.262212][ C4] x9 : ffffffc010023e50 x8 : dead000000000122\n[ 9436.262216][ C4] x7 : ffffffffffffffff x6 : ffffffc0100239d8\n[ 9436.262220][ C4] x5 : 0000000000000000 x4 : 0000000000000101\n[ 9436.262223][ C4] x3 : 0000000000000080 x2 : ffffff8\n---truncated---

See more information about CVE-2023-52635 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	4.4	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	High	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14