CVE-2023-42752: Kernel: integer overflow in igmpv3_newpack leading to exploitable memory access

Vulnerability summary

CVE-2023-42752 is a medium (CVSS 5.5) Integer Overflow or Wraparound vulnerability in linux linux_kernel. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 18.1% of scored vulnerabilities.

Timeline

1. 13-10-2023
   PublishedVulnerability first disclosed.
2. 02-08-2024
   Last modifiedVulnerability information updated.

Description

An integer overflow flaw was found in the Linux kernel. This issue leads to the kernel allocating `skb_shared_info` in the userspace, which is exploitable in systems without SMAP protection since `skb_shared_info` contains references to function pointers.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.