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medium5.3

CVE-2020-12826

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2.

Impact

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
before 5.6.5
CanonicalUbuntu Linux
Version 20.04
RedhatEnterprise Linux
Versions 5.0, 6.0, 7.0, 8.0
RedhatEnterprise Mrg
Version 2.0

Weakness classification

CWE-190

References