| 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-2024-46761: pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv |
| |
| The hotplug driver for powerpc (pci/hotplug/pnv_php.c) causes a kernel |
| crash when we try to hot-unplug/disable the PCIe switch/bridge from |
| the PHB. |
| |
| The crash occurs because although the MSI data structure has been |
| released during disable/hot-unplug path and it has been assigned |
| with NULL, still during unregistration the code was again trying to |
| explicitly disable the MSI which causes the NULL pointer dereference and |
| kernel crash. |
| |
| The patch fixes the check during unregistration path to prevent invoking |
| pci_disable_msi/msix() since its data structure is already freed. |
| |
| The Linux kernel CVE team has assigned CVE-2024-46761 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.19.322 with commit 4eb4085c1346d19d4a05c55246eb93e74e671048 |
| Fixed in 5.4.284 with commit c4c681999d385e28f84808bbf3a85ea8e982da55 |
| Fixed in 5.10.226 with commit bc1faed19db95abf0933b104910a3fb01b138f59 |
| Fixed in 5.15.167 with commit c0d8094dc740cfacf3775bbc6a1c4720459e8de4 |
| Fixed in 6.1.110 with commit 438d522227374042b5c8798f8ce83bbe479dca4d |
| Fixed in 6.6.51 with commit b82d4d5c736f4fd2ed224c35f554f50d1953d21e |
| Fixed in 6.10.10 with commit bfc44075b19740d372f989f21dd03168bfda0689 |
| Fixed in 6.11 with commit 335e35b748527f0c06ded9eebb65387f60647fda |
| |
| 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-2024-46761 |
| 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/pci/hotplug/pnv_php.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/4eb4085c1346d19d4a05c55246eb93e74e671048 |
| https://git.kernel.org/stable/c/c4c681999d385e28f84808bbf3a85ea8e982da55 |
| https://git.kernel.org/stable/c/bc1faed19db95abf0933b104910a3fb01b138f59 |
| https://git.kernel.org/stable/c/c0d8094dc740cfacf3775bbc6a1c4720459e8de4 |
| https://git.kernel.org/stable/c/438d522227374042b5c8798f8ce83bbe479dca4d |
| https://git.kernel.org/stable/c/b82d4d5c736f4fd2ed224c35f554f50d1953d21e |
| https://git.kernel.org/stable/c/bfc44075b19740d372f989f21dd03168bfda0689 |
| https://git.kernel.org/stable/c/335e35b748527f0c06ded9eebb65387f60647fda |
