CVE-2024-42235: s390/mm: Add NULL pointer check to crst_table_free() base_crst_free()
First published: Wed Aug 07 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: s390/mm: Add NULL pointer check to crst_table_free() base_crst_free() crst_table_free() used to work with NULL pointers before the conversion to ptdescs. Since crst_table_free() can be called with a NULL pointer (error handling in crst_table_upgrade() add an explicit check. Also add the same check to base_crst_free() for consistency reasons. In real life this should not happen, since order two GFP_KERNEL allocations will not fail, unless FAIL_PAGE_ALLOC is enabled and used.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.6<6.6.41 | |
| Linux Linux kernel | >=6.7<6.9.10 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/794fa52b94637d6b2e8c9474fbe3983af5c9f046
- https://git.kernel.org/stable/c/b5efb63acf7bddaf20eacfcac654c25c446eabe8
- https://git.kernel.org/stable/c/f80bd8bb6f380bc265834c46058d38b34174813e
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42235
- https://nvd.nist.gov/vuln/detail/CVE-2024-42235
- https://launchpad.net/bugs/cve/CVE-2024-42235
- https://security-tracker.debian.org/tracker/CVE-2024-42235
- https://ubuntu.com/security/CVE-2024-42235
- https://git.kernel.org/linus/b5efb63acf7bddaf20eacfcac654c25c446eabe8
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