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CVE-2024-42318

Disclosure Date: August 17, 2024 •
CVE-2024-42318
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Description

In the Linux kernel, the following vulnerability has been resolved:

landlock: Don’t lose track of restrictions on cred_transfer

When a process’ cred struct is replaced, this almost always invokes
the cred_prepare LSM hook; but in one special case (when
KEYCTL_SESSION_TO_PARENT updates the parent’s credentials), the
cred_transfer LSM hook is used instead. Landlock only implements the
cred_prepare hook, not cred_transfer, so KEYCTL_SESSION_TO_PARENT causes
all information on Landlock restrictions to be lost.

This basically means that a process with the ability to use the fork()
and keyctl() syscalls can get rid of all Landlock restrictions on
itself.

Fix it by adding a cred_transfer hook that does the same thing as the
existing cred_prepare hook. (Implemented by having hook_cred_prepare()
call hook_cred_transfer() so that the two functions are less likely to
accidentally diverge in the future.)

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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OS
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Vulnerable Versions
Linux 916c648323fa
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis