CyberSecBulletin
CVE-2023-52764NVD status: Analyzed

Linux: Out-of-bounds Write

Published Updated By the CyberSecBulletin desk

CVE-2023-52764 is a high-severity out-of-bounds write vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 69bba62600bd91d6b7c1e8ca181faf8ac64f7060, 2eee8edfff90e22980a6b22079d238c3c9d323bb, 8f83c85ee88225319c52680792320c02158c2a9b 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 0.26% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 69bba62600bd91d6b7c1e8ca181faf8ac64f7060 or 2eee8edfff90e22980a6b22079d238c3c9d323bb or 8f83c85ee88225319c52680792320c02158c2a9b or c6b6b8692218da73b33b310d7c1df90f115bdd9a, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 4.14.331 or 4.19.300 or 5.4.262 or 5.10.202, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, 69bba62600bd91d6b7c1e8ca181faf8ac64f7060; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, 2eee8edfff90e22980a6b22079d238c3c9d323bb; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, 8f83c85ee88225319c52680792320c02158c2a9b; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, c6b6b8692218da73b33b310d7c1df90f115bdd9a; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, 09cd8b561aa9796903710a1046957f2b112c8f26; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, a647f27a7426d2fe1b40da7c8fa2b81354a51177; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, 93bddd6529f187f510eec759f37d0569243c9809; 54e8bc5d64a651e2fb8b2366637e6a7d920a4c70 up to, but not including, e2d7149b913d14352c82624e723ce1c211ca06d3; and 2 more ranges69bba62600bd91d6b7c1e8ca181faf8ac64f7060, 2eee8edfff90e22980a6b22079d238c3c9d323bb, 8f83c85ee88225319c52680792320c02158c2a9b, c6b6b8692218da73b33b310d7c1df90f115bdd9a, 09cd8b561aa9796903710a1046957f2b112c8f26, a647f27a7426d2fe1b40da7c8fa2b81354a51177
LinuxLinux Kernelbefore 4.14.331; 4.15 up to, but not including, 4.19.300; 4.20 up to, but not including, 5.4.262; 5.5 up to, but not including, 5.10.202; 5.11 up to, but not including, 5.15.140; 5.16 up to, but not including, 6.1.64; 6.2 up to, but not including, 6.5.13; 6.6 up to, but not including, 6.6.34.14.331, 4.19.300, 5.4.262, 5.10.202, 5.15.140, 6.1.64

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
HighData or code can be modified at will.
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:H/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: media: gspca: cpia1: shift-out-of-bounds in set_flicker Syzkaller reported the following issue: UBSAN: shift-out-of-bounds in drivers/media/usb/gspca/cpia1.c:1031:27 shift exponent 245 is too large for 32-bit type 'int' When the value of the variable "sd->params.exposure.gain" exceeds the number of bits in an integer, a shift-out-of-bounds error is reported. It is triggered because the variable "currentexp" cannot be left-shifted by more than the number of bits in an integer. In order to avoid invalid range during left-shift, the conditional expression is added.

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

The underlying weakness: Out-of-bounds Write

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

How developers prevent this class of flaw

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Examples include the Safe C String Library (SafeStr) by Messier and Viega, and the Strsafe.h library from Microsoft. These libraries provide safer versions of overflow-prone string-handling functions.
  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.

More Out-of-bounds Write vulnerabilities (CWE-787)

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

Recent Out-of-bounds Write vulnerabilities

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