CVE-2023-21218

In PMRChangeSparseMemOSMem of physmem_osmem_linux.c, there is a possible out of bounds write due to an incorrect bounds check

published December 4, 2023

CVSS
—
EPSS
0%
Percentile
34.6
In the wild
Unconfirmed
What it is

⚠️ A sneaky out-of-bounds write could let anyone escalate their privileges in the kernel — no user interaction needed! This bug in PMRChangeSparseMemOSMem is like leaving a back door open at your digital castle. 🏰 Think of it like a poorly designed buffet line where anyone can sneak in and pile extra food on their plate without anyone noticing. This vulnerability allows an attacker to bypass security measures without raising alarms, just like that sneaky diner getting away with extra servings! An attacker could gain local escalation of privilege, allowing them to access or modify files and processes they shouldn’t be allowed to touch. If exploited, this could lead to a full takeover of the system's kernel, putting sensitive data and system integrity at serious risk. 🔥

Put simply

Think of it like a poorly designed buffet line where anyone can sneak in and pile extra food on their plate without anyone noticing. This vulnerability allows an attacker to bypass security measures without raising alarms, just like that sneaky diner getting away with extra servings! This vulnerability arises from an incorrect bounds check in the PMRChangeSparseMemOSMem function within physmem_osmem_linux.c. This oversight allows attackers to write beyond allocated memory areas, potentially leading to privilege escalation within the kernel without additional execution privileges.

What to do

An attacker could gain local escalation of privilege, allowing them to access or modify files and processes they shouldn’t be allowed to touch. If exploited, this could lead to a full takeover of the system's kernel, putting sensitive data and system integrity at serious risk. 🔥 To remediate this issue, ensure that your system is patched with the latest updates from the vendor. Developers should review their code for similar out-of-bounds checks and implement stricter validation mechanisms. Regularly auditing your kernel and associated components can also help prevent such vulnerabilities. 🛡️ You’ve got this! With a few adjustments, you can keep your digital fortress fortified and secure! 💪✨

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00414 · 34.6th percentile
Published
2023-12-04T22:40Z
EPSS history
Timeline
  • 04 DEC 22:40Z
    In PMRChangeSparseMemOSMem of physmem_osmem_linux.c, there is a possible out of bounds write due to an incorrect bounds check
    cvelistv5