| 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-2024-57793: virt: tdx-guest: Just leak decrypted memory on unrecoverable errors |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| virt: tdx-guest: Just leak decrypted memory on unrecoverable errors |
| |
| In CoCo VMs it is possible for the untrusted host to cause |
| set_memory_decrypted() to fail such that an error is returned |
| and the resulting memory is shared. Callers need to take care |
| to handle these errors to avoid returning decrypted (shared) |
| memory to the page allocator, which could lead to functional |
| or security issues. |
| |
| Leak the decrypted memory when set_memory_decrypted() fails, |
| and don't need to print an error since set_memory_decrypted() |
| will call WARN_ONCE(). |
| |
| The Linux kernel CVE team has assigned CVE-2024-57793 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit f4738f56d1dc62aaba69b33702a5ab098f1b8c63 and fixed in 6.12.8 with commit 1429ae7b7d4759a1e362456b8911c701bae655b4 |
| Issue introduced in 6.7 with commit f4738f56d1dc62aaba69b33702a5ab098f1b8c63 and fixed in 6.13 with commit 27834971f616c5e154423c578fa95e0444444ce1 |
| |
| 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-2024-57793 |
| 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/virt/coco/tdx-guest/tdx-guest.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/1429ae7b7d4759a1e362456b8911c701bae655b4 |
| https://git.kernel.org/stable/c/27834971f616c5e154423c578fa95e0444444ce1 |
