PT-2023-9469 · Linux+8 · Linux Kernel+8
Alexei Starovoitov
·
Published
2023-10-08
·
Updated
2026-03-14
·
CVE-2023-52476
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A panic can occur when a vsyscall is made while LBR sampling is active. If the vsyscall is interrupted for perf sampling, a specific call sequence can occur, leading to an unhandled page fault. The issue arises from the access to an address in the vsyscall region. To fix the bug, filtering for vsyscalls can be done when determining the branch type, returning a "none" branch if a kernel address is found to lie in the vsyscall region. The vulnerable function names include
insn get emulate prefix(), insn get emulate prefix(), insn get prefixes(), insn get opcode(), decode branch type(), get branch type(), intel pmu lbr filter(), intel pmu handle irq(), and perf event nmi handler(). A macro peek nbyte next(insn byte t, insn, i) is also called, leading to a dereference of (insn)->next byte.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Out of bounds Read
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Almalinux
Astra Linux
Centos
Debian
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse