| 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-2023-52576: x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer() |
| |
| The code calling ima_free_kexec_buffer() runs long after the memblock |
| allocator has already been torn down, potentially resulting in a use |
| after free in memblock_isolate_range(). |
| |
| With KASAN or KFENCE, this use after free will result in a BUG |
| from the idle task, and a subsequent kernel panic. |
| |
| Switch ima_free_kexec_buffer() over to memblock_free_late() to avoid |
| that bug. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52576 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit fee3ff99bc67604fba77f19da0106f3ec52b1956 and fixed in 6.1.56 with commit eef16bfdb212da60f5144689f2967fb25b051a2b |
| Issue introduced in 5.13 with commit fee3ff99bc67604fba77f19da0106f3ec52b1956 and fixed in 6.5.6 with commit d2dfbc0e3b7a04c2d941421a958dc31c897fb204 |
| Issue introduced in 5.13 with commit fee3ff99bc67604fba77f19da0106f3ec52b1956 and fixed in 6.6 with commit 34cf99c250d5cd2530b93a57b0de31d3aaf8685b |
| |
| 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-2023-52576 |
| 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/setup.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/eef16bfdb212da60f5144689f2967fb25b051a2b |
| https://git.kernel.org/stable/c/d2dfbc0e3b7a04c2d941421a958dc31c897fb204 |
| https://git.kernel.org/stable/c/34cf99c250d5cd2530b93a57b0de31d3aaf8685b |
