CVE-2024-42318 (GCVE-0-2024-42318)

Vulnerability from cvelistv5 – Published: 2024-08-17 09:09 – Updated: 2025-11-03 22:04
VLAI?
Title
landlock: Don't lose track of restrictions on cred_transfer
Summary
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.)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 916c648323fa53b89eedb34a0988ddaf01406117 (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 16896914bace82d7811c62f3b6d5320132384f49 (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < b14cc2cf313bd29056fadbc8ecd7f957cf5791ff (git)
Affected: 385975dca53eb41031d0cbd1de318eb1bc5d6bb9 , < 39705a6c29f8a2b93cf5b99528a55366c50014d1 (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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