| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.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 81732c3b2fede049a692e58a7ceabb6d18ffb18c and fixed in 4.19.312 with commit c8686c014b5e872ba7e334f33ca553f14446fc29 |
| Issue introduced in 3.7 with commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c and fixed in 5.4.274 with commit 815be99d934e3292906536275f2b8d5131cdf52c |
| Issue introduced in 3.7 with commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c and fixed in 5.10.132 with commit bfee93c9a6c395f9aa62268f1cedf64999844926 |
| Issue introduced in 3.7 with commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c and fixed in 5.15.56 with commit 57964a5710252bc82fe22d9fa98c180c58c20244 |
| Issue introduced in 3.7 with commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c and fixed in 5.18.13 with commit 14d2cc21ca622310babf373e3a8f0b40acfe8265 |
| Issue introduced in 3.7 with commit 81732c3b2fede049a692e58a7ceabb6d18ffb18c and fixed in 5.19 with commit 39cdb68c64d84e71a4a717000b6e5de208ee60cc |
| |
| 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-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/c8686c014b5e872ba7e334f33ca553f14446fc29 |
| https://git.kernel.org/stable/c/815be99d934e3292906536275f2b8d5131cdf52c |
| 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 |
