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Date: Thu, 29 Feb 2024 15:52:54 +0000 From: Lee Jones <lee@...nel.org> To: linux-cve-announce@...r.kernel.org Cc: Lee Jones <lee@...nel.org> Subject: CVE-2023-52494: bus: mhi: host: Add alignment check for event ring read pointer Description =========== In the Linux kernel, the following vulnerability has been resolved: bus: mhi: host: Add alignment check for event ring read pointer Though we do check the event ring read pointer by "is_valid_ring_ptr" to make sure it is in the buffer range, but there is another risk the pointer may be not aligned. Since we are expecting event ring elements are 128 bits(struct mhi_ring_element) aligned, an unaligned read pointer could lead to multiple issues like DoS or ring buffer memory corruption. So add a alignment check for event ring read pointer. The Linux kernel CVE team has assigned CVE-2023-52494 to this issue. Affected and fixed versions =========================== Issue introduced in 5.13 with commit ec32332df764 and fixed in 5.15.149 with commit 94991728c84f Issue introduced in 5.13 with commit ec32332df764 and fixed in 6.1.76 with commit 2df39ac8f813 Issue introduced in 5.13 with commit ec32332df764 and fixed in 6.6.15 with commit a9ebfc405fe1 Issue introduced in 5.13 with commit ec32332df764 and fixed in 6.7.3 with commit ecf832011182 Issue introduced in 5.13 with commit ec32332df764 and fixed in 6.8-rc1 with commit eff9704f5332 Please see https://www.kernel.org or 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-2023-52494 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/bus/mhi/host/main.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/94991728c84f8df54fd9eec9b85855ef9057ea08 https://git.kernel.org/stable/c/2df39ac8f813860f79782807c3f7acff40b3c551 https://git.kernel.org/stable/c/a9ebfc405fe1be145f414eafadcbf09506082010 https://git.kernel.org/stable/c/ecf8320111822a1ae5d5fc512953eab46d543d0b https://git.kernel.org/stable/c/eff9704f5332a13b08fbdbe0f84059c9e7051d5f
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