| 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-2024-40944: x86/kexec: Fix bug with call depth tracking |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| x86/kexec: Fix bug with call depth tracking |
| |
| The call to cc_platform_has() triggers a fault and system crash if call depth |
| tracking is active because the GS segment has been reset by load_segments() and |
| GS_BASE is now 0 but call depth tracking uses per-CPU variables to operate. |
| |
| Call cc_platform_has() earlier in the function when GS is still valid. |
| |
| [ bp: Massage. ] |
| |
| The Linux kernel CVE team has assigned CVE-2024-40944 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.2 with commit 5d8213864ade86b48fc492584ea86d65a62f892e and fixed in 6.6.35 with commit d91ddd05082691e69b30744825d18ae799293258 |
| Issue introduced in 6.2 with commit 5d8213864ade86b48fc492584ea86d65a62f892e and fixed in 6.9.6 with commit 2cfb464669b645a9b98478b74f2bcea9860dcff1 |
| Issue introduced in 6.2 with commit 5d8213864ade86b48fc492584ea86d65a62f892e and fixed in 6.10 with commit 93c1800b3799f17375989b0daf76497dd3e80922 |
| |
| 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-2024-40944 |
| 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/kernel/machine_kexec_64.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/d91ddd05082691e69b30744825d18ae799293258 |
| https://git.kernel.org/stable/c/2cfb464669b645a9b98478b74f2bcea9860dcff1 |
| https://git.kernel.org/stable/c/93c1800b3799f17375989b0daf76497dd3e80922 |
