| 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-2024-46794: x86/tdx: Fix data leak in mmio_read() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| x86/tdx: Fix data leak in mmio_read() |
| |
| The mmio_read() function makes a TDVMCALL to retrieve MMIO data for an |
| address from the VMM. |
| |
| Sean noticed that mmio_read() unintentionally exposes the value of an |
| initialized variable (val) on the stack to the VMM. |
| |
| This variable is only needed as an output value. It did not need to be |
| passed to the VMM in the first place. |
| |
| Do not send the original value of *val to the VMM. |
| |
| [ dhansen: clarify what 'val' is used for. ] |
| |
| The Linux kernel CVE team has assigned CVE-2024-46794 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.19 with commit 31d58c4e557d46fa7f8557714250fb6f89c941ae and fixed in 6.1.110 with commit 26c6af49d26ffc377e392e30d4086db19eed0ef7 |
| Issue introduced in 5.19 with commit 31d58c4e557d46fa7f8557714250fb6f89c941ae and fixed in 6.6.51 with commit ef00818c50cf55a3a56bd9a9fae867c92dfb84e7 |
| Issue introduced in 5.19 with commit 31d58c4e557d46fa7f8557714250fb6f89c941ae and fixed in 6.10.10 with commit b55ce742afcb8e8189d82f2f1e635ba1b5a461fa |
| Issue introduced in 5.19 with commit 31d58c4e557d46fa7f8557714250fb6f89c941ae and fixed in 6.11 with commit b6fb565a2d15277896583d471b21bc14a0c99661 |
| |
| 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-2024-46794 |
| 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: |
| arch/x86/coco/tdx/tdx.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/26c6af49d26ffc377e392e30d4086db19eed0ef7 |
| https://git.kernel.org/stable/c/ef00818c50cf55a3a56bd9a9fae867c92dfb84e7 |
| https://git.kernel.org/stable/c/b55ce742afcb8e8189d82f2f1e635ba1b5a461fa |
| https://git.kernel.org/stable/c/b6fb565a2d15277896583d471b21bc14a0c99661 |
