CyberSecBulletin
CVE-2024-36916NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2024-36916 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 62accf6c1d7b433752cb3591bba8967b7a801ad5, 844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1, f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.73% chance of exploitation within 30 days, higher than 55% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 62accf6c1d7b433752cb3591bba8967b7a801ad5 or 844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1 or f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca or ce0e99cae00e3131872936713b7f55eefd53ab86, whichever matches your release line, or a later version.
  2. Update RUGGEDCOM RST2428P to V3.1 or a later version.
  3. Update SCALANCE XCM-/XRM-/XCH-/XRH-300 family to V3.1 or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux5160a5a53c0c4ae3708959d9465ea43ad5d90542 up to, but not including, 62accf6c1d7b433752cb3591bba8967b7a801ad5; 5160a5a53c0c4ae3708959d9465ea43ad5d90542 up to, but not including, 844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1; 5160a5a53c0c4ae3708959d9465ea43ad5d90542 up to, but not including, f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca; 5160a5a53c0c4ae3708959d9465ea43ad5d90542 up to, but not including, ce0e99cae00e3131872936713b7f55eefd53ab86; 5160a5a53c0c4ae3708959d9465ea43ad5d90542 up to, but not including, 488dc6808cb8369685f18cee81e88e7052ac153b; 5160a5a53c0c4ae3708959d9465ea43ad5d90542 up to, but not including, beaa51b36012fad5a4d3c18b88a617aea7a9b96d; 5.1062accf6c1d7b433752cb3591bba8967b7a801ad5, 844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1, f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca, ce0e99cae00e3131872936713b7f55eefd53ab86, 488dc6808cb8369685f18cee81e88e7052ac153b, beaa51b36012fad5a4d3c18b88a617aea7a9b96d
SiemensRUGGEDCOM RST2428Pbefore V3.1V3.1
SiemensSCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familyNot specified in the recordNot stated
SiemensSCALANCE XCM-/XRM-/XCH-/XRH-300 familybefore V3.1V3.1
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystembefore V1.1.1V1.1.1
LinuxLinux Kernel5.10 up to, but not including, 5.10.217; 5.11 up to, but not including, 5.15.159; 5.16 up to, but not including, 6.1.91; 6.2 up to, but not including, 6.6.31; 6.7 up to, but not including, 6.8.10; 6.95.10.217, 5.15.159, 6.1.91, 6.6.31, 6.8.10
DebianDebian Linux10.0Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.1HighNVD
CVSS 3.16.5MediumCISA (ADP)

Official description

In the Linux kernel, the following vulnerability has been resolved: blk-iocost: avoid out of bounds shift UBSAN catches undefined behavior in blk-iocost, where sometimes iocg->delay is shifted right by a number that is too large, resulting in undefined behavior on some architectures. [ 186.556576] ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in block/blk-iocost.c:1366:23 shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long') CPU: 16 PID: 0 Comm: swapper/16 Tainted: G S E N 6.9.0-0_fbk700_debug_rc2_kbuilder_0_gc85af715cac0 #1 Hardware name: Quanta Twin Lakes MP/Twin Lakes Passive MP, BIOS F09_3A23 12/08/2020 Call Trace: <IRQ> dump_stack_lvl+0x8f/0xe0 __ubsan_handle_shift_out_of_bounds+0x22c/0x280 iocg_kick_delay+0x30b/0x310 ioc_timer_fn+0x2fb/0x1f80 __run_timer_base+0x1b6/0x250 ... Avoid that undefined behavior by simply taking the "delay = 0" branch if the shift is too large. I am not sure what the symptoms of an undefined value delay will be, but I suspect it could be more than a little annoying to debug.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Out-of-bounds Read vulnerabilities

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