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Message-ID: <2025100118-CVE-2025-39902-0fe1@gregkh> Date: Wed, 1 Oct 2025 09:43:26 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-39902: mm/slub: avoid accessing metadata when pointer is invalid in object_err() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== 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. The Linux kernel CVE team has assigned CVE-2025-39902 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 5.4.299 with commit 872f2c34ff232af1e65ad2df86d61163c8ffad42 Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 5.10.243 with commit f66012909e7bf383fcdc5850709ed5716073fdc4 Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 5.15.192 with commit 7e287256904ee796c9477e3ec92b07f236481ef3 Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 6.1.151 with commit 1f0797f17927b5cad0fb7eced422f9a7c30a3191 Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 6.6.105 with commit 0ef7058b4dc6fcef622ac23b45225db57f17b83f Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 6.12.46 with commit dda6ec365ab04067adae40ef17015db447e90736 Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 6.16.6 with commit 3baa1da473e6e50281324ff1d332d1a07a3bb02e Issue introduced in 2.6.22 with commit 81819f0fc8285a2a5a921c019e3e3d7b6169d225 and fixed in 6.17 with commit b4efccec8d06ceb10a7d34d7b1c449c569d53770 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-39902 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: mm/slub.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42 https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4 https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3 https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191 https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736 https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e https://git.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770
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