UBUNTU-CVE-2025-39902
In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid accessing metadata when pointer is invalid in object_err() object_err() reports details of an object for further debugging, such as the freelist pointer, redzone, etc. However, if the pointer is invalid, attempting to access object metadata can lead to a crash since it does not point to a valid object. One known path to the crash is when alloc_consistency_checks() determines the pointer to the allocated object is invalid because of a freelist corruption, and calls object_err() to report it. The debug code should report and handle the corruption gracefully and not crash in the process. In case the pointer is NULL or check_valid_pointer() returns false for the pointer, only print the pointer value and skip accessing metadata.
02 / AFFECTED SOFTWARE
Affected packages
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1 explicit affected versions
69 explicit affected versions
123 explicit affected versions
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66 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid accessing metadata when pointer is invalid in object_err() object_err() reports details of an object for further debugging, such as the freelist pointer, redzone, etc. However, if the pointer is invalid, attempting to access object metadata can lead to a crash since it does not point to a valid object. One known path to the crash is when alloc_consistency_checks() determines the pointer to the allocated object is invalid because of a freelist corruption, and calls object_err() to report it. The debug code should report and handle the corruption gracefully and not crash in the process. In case the pointer is NULL or check_valid_pointer() returns false for the pointer, only print the pointer value and skip accessing metadata.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/b4efccec8d06ceb10a7d34d7b1c449c569d53770
- https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f
- https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191
- https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e
- https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3
- https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42
- https://git.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770
- https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736
- https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4
- https://ubuntu.com/security/CVE-2025-39902
- https://ubuntu.com/security/notices/USN-7909-1
- https://ubuntu.com/security/notices/USN-7909-2
- https://ubuntu.com/security/notices/USN-7909-3
- https://ubuntu.com/security/notices/USN-7909-4
- https://ubuntu.com/security/notices/USN-7909-5
- https://ubuntu.com/security/notices/USN-7910-1
- https://ubuntu.com/security/notices/USN-7910-2
- https://ubuntu.com/security/notices/USN-7933-1
- https://ubuntu.com/security/notices/USN-7938-1
- https://ubuntu.com/security/notices/USN-8095-1
- https://ubuntu.com/security/notices/USN-8095-2
- https://ubuntu.com/security/notices/USN-8095-3
- https://ubuntu.com/security/notices/USN-8095-4
- https://ubuntu.com/security/notices/USN-8095-5
- https://ubuntu.com/security/notices/USN-8100-1
- https://ubuntu.com/security/notices/USN-8125-1
- https://ubuntu.com/security/notices/USN-8126-1
- https://ubuntu.com/security/notices/USN-8165-1
- https://ubuntu.com/security/notices/USN-8261-1
- https://www.cve.org/CVERecord?id=CVE-2025-39902