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Date: Wed, 1 May 2024 07:21:33 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-26943: nouveau/dmem: handle kcalloc() allocation failure Description =========== In the Linux kernel, the following vulnerability has been resolved: nouveau/dmem: handle kcalloc() allocation failure The kcalloc() in nouveau_dmem_evict_chunk() will return null if the physical memory has run out. As a result, if we dereference src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs will happen. Moreover, the GPU is going away. If the kcalloc() fails, we could not evict all pages mapping a chunk. So this patch adds a __GFP_NOFAIL flag in kcalloc(). Finally, as there is no need to have physically contiguous memory, this patch switches kcalloc() to kvcalloc() in order to avoid failing allocations. The Linux kernel CVE team has assigned CVE-2024-26943 to this issue. Affected and fixed versions =========================== Issue introduced in 6.1 with commit 249881232e14 and fixed in 6.1.84 with commit 9acfd8b083a0 Issue introduced in 6.1 with commit 249881232e14 and fixed in 6.6.24 with commit 2a84744a037b Issue introduced in 6.1 with commit 249881232e14 and fixed in 6.7.12 with commit 5e81773757a9 Issue introduced in 6.1 with commit 249881232e14 and fixed in 6.8.3 with commit 3e82f7383e0b Issue introduced in 6.1 with commit 249881232e14 and fixed in 6.9-rc2 with commit 16e87fe23d4a 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-2024-26943 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: drivers/gpu/drm/nouveau/nouveau_dmem.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/9acfd8b083a0ffbd387566800d89f55058a68af2 https://git.kernel.org/stable/c/2a84744a037b8a511d6a9055f3defddc28ff4a4d https://git.kernel.org/stable/c/5e81773757a95fc298e96cfd6d4700f07b6192a2 https://git.kernel.org/stable/c/3e82f7383e0b82a835e6b6b06a348b2bc4e2c2ee https://git.kernel.org/stable/c/16e87fe23d4af6df920406494ced5c0f4354567b
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