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Message-ID: <2024053033-CVE-2024-36891-aada@gregkh> Date: Thu, 30 May 2024 17:28:43 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-36891: maple_tree: fix mas_empty_area_rev() null pointer dereference Description =========== In the Linux kernel, the following vulnerability has been resolved: maple_tree: fix mas_empty_area_rev() null pointer dereference Currently the code calls mas_start() followed by mas_data_end() if the maple state is MA_START, but mas_start() may return with the maple state node == NULL. This will lead to a null pointer dereference when checking information in the NULL node, which is done in mas_data_end(). Avoid setting the offset if there is no node by waiting until after the maple state is checked for an empty or single entry state. A user could trigger the events to cause a kernel oops by unmapping all vmas to produce an empty maple tree, then mapping a vma that would cause the scenario described above. The Linux kernel CVE team has assigned CVE-2024-36891 to this issue. Affected and fixed versions =========================== Issue introduced in 6.1 with commit 54a611b60590 and fixed in 6.6.31 with commit 6c9c7c1e63b1 Issue introduced in 6.1 with commit 54a611b60590 and fixed in 6.8.10 with commit f3956791cf52 Issue introduced in 6.1 with commit 54a611b60590 and fixed in 6.9 with commit 955a923d2809 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-2024-36891 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: lib/maple_tree.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/6c9c7c1e63b198a8b979ad963eb21410f10ccb00 https://git.kernel.org/stable/c/f3956791cf526540addd3295e4c1e0f0442486cc https://git.kernel.org/stable/c/955a923d2809803980ff574270f81510112be9cf
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