| 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-2024-27067: xen/evtchn: avoid WARN() when unbinding an event channel |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| xen/evtchn: avoid WARN() when unbinding an event channel |
| |
| When unbinding a user event channel, the related handler might be |
| called a last time in case the kernel was built with |
| CONFIG_DEBUG_SHIRQ. This might cause a WARN() in the handler. |
| |
| Avoid that by adding an "unbinding" flag to struct user_event which |
| will short circuit the handler. |
| |
| The Linux kernel CVE team has assigned CVE-2024-27067 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6.19 with commit 3c8f5965a99397368d3762a9814a21a3e442e1a4 and fixed in 6.6.23 with commit 99e425032c6ec13584d3cd33846e0c7307501b47 |
| Issue introduced in 6.7 with commit 9e90e58c11b74c2bddac4b2702cf79d36b981278 and fixed in 6.7.11 with commit 35485dad6e28f9b17884764d4692b1655cb848d0 |
| Issue introduced in 6.7 with commit 9e90e58c11b74c2bddac4b2702cf79d36b981278 and fixed in 6.8.2 with commit 9e2d4b58c1da48a32905802aaeadba7084b46895 |
| Issue introduced in 6.7 with commit 9e90e58c11b74c2bddac4b2702cf79d36b981278 and fixed in 6.9 with commit 51c23bd691c0f1fb95b29731c356c6fd69925d17 |
| |
| 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-2024-27067 |
| 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/xen/evtchn.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/99e425032c6ec13584d3cd33846e0c7307501b47 |
| https://git.kernel.org/stable/c/35485dad6e28f9b17884764d4692b1655cb848d0 |
| https://git.kernel.org/stable/c/9e2d4b58c1da48a32905802aaeadba7084b46895 |
| https://git.kernel.org/stable/c/51c23bd691c0f1fb95b29731c356c6fd69925d17 |
