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Message-ID: <2024030252-CVE-2022-48627-c7bf@gregkh> Date: Sat, 2 Mar 2024 22:31:53 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2022-48627: vt: fix memory overlapping when deleting chars in the buffer Description =========== In the Linux kernel, the following vulnerability has been resolved: vt: fix memory overlapping when deleting chars in the buffer A memory overlapping copy occurs when deleting a long line. This memory overlapping copy can cause data corruption when scr_memcpyw is optimized to memcpy because memcpy does not ensure its behavior if the destination buffer overlaps with the source buffer. The line buffer is not always broken, because the memcpy utilizes the hardware acceleration, whose result is not deterministic. Fix this problem by using replacing the scr_memcpyw with scr_memmovew. The Linux kernel CVE team has assigned CVE-2022-48627 to this issue. Affected and fixed versions =========================== Issue introduced in 3.7 with commit 81732c3b2fed and fixed in 5.10.132 with commit bfee93c9a6c3 Issue introduced in 3.7 with commit 81732c3b2fed and fixed in 5.15.56 with commit 57964a571025 Issue introduced in 3.7 with commit 81732c3b2fed and fixed in 5.18.13 with commit 14d2cc21ca62 Issue introduced in 3.7 with commit 81732c3b2fed and fixed in 5.19 with commit 39cdb68c64d8 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-2022-48627 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/tty/vt/vt.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/bfee93c9a6c395f9aa62268f1cedf64999844926 https://git.kernel.org/stable/c/57964a5710252bc82fe22d9fa98c180c58c20244 https://git.kernel.org/stable/c/14d2cc21ca622310babf373e3a8f0b40acfe8265 https://git.kernel.org/stable/c/39cdb68c64d84e71a4a717000b6e5de208ee60cc
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