| 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-2024-48876: stackdepot: fix stack_depot_save_flags() in NMI context |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| stackdepot: fix stack_depot_save_flags() in NMI context |
| |
| Per documentation, stack_depot_save_flags() was meant to be usable from |
| NMI context if STACK_DEPOT_FLAG_CAN_ALLOC is unset. However, it still |
| would try to take the pool_lock in an attempt to save a stack trace in the |
| current pool (if space is available). |
| |
| This could result in deadlock if an NMI is handled while pool_lock is |
| already held. To avoid deadlock, only try to take the lock in NMI context |
| and give up if unsuccessful. |
| |
| The documentation is fixed to clearly convey this. |
| |
| The Linux kernel CVE team has assigned CVE-2024-48876 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 4434a56ec20925333d6cf4d4093641d063abd35b and fixed in 6.12.5 with commit 9bfeeeff2c92b9dd261198b601b45bde4c529841 |
| Issue introduced in 6.8 with commit 4434a56ec20925333d6cf4d4093641d063abd35b and fixed in 6.13 with commit 031e04bdc834cda3b054ef6b698503b2b97e8186 |
| |
| 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-2024-48876 |
| 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: |
| include/linux/stackdepot.h |
| lib/stackdepot.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/9bfeeeff2c92b9dd261198b601b45bde4c529841 |
| https://git.kernel.org/stable/c/031e04bdc834cda3b054ef6b698503b2b97e8186 |
