| 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-2024-26621: mm: huge_memory: don't force huge page alignment on 32 bit |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm: huge_memory: don't force huge page alignment on 32 bit |
| |
| commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP |
| boundaries") caused two issues [1] [2] reported on 32 bit system or compat |
| userspace. |
| |
| It doesn't make too much sense to force huge page alignment on 32 bit |
| system due to the constrained virtual address space. |
| |
| [1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@kernel.org/ |
| [2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/ |
| |
| The Linux kernel CVE team has assigned CVE-2024-26621 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.18 with commit 1854bc6e2420472676c5c90d3d6b15f6cd640e40 and fixed in 6.1.81 with commit 87632bc9ecff5ded93433bc0fca428019bdd1cfe |
| Issue introduced in 5.18 with commit 1854bc6e2420472676c5c90d3d6b15f6cd640e40 and fixed in 6.6.46 with commit 6ea9aa8d97e6563676094cb35755884173269555 |
| Issue introduced in 5.18 with commit 1854bc6e2420472676c5c90d3d6b15f6cd640e40 and fixed in 6.7.6 with commit 7432376c913381c5f24d373a87ff629bbde94b47 |
| Issue introduced in 5.18 with commit 1854bc6e2420472676c5c90d3d6b15f6cd640e40 and fixed in 6.8 with commit 4ef9ad19e17676b9ef071309bc62020e2373705d |
| |
| 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-2024-26621 |
| 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: |
| mm/huge_memory.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/87632bc9ecff5ded93433bc0fca428019bdd1cfe |
| https://git.kernel.org/stable/c/6ea9aa8d97e6563676094cb35755884173269555 |
| https://git.kernel.org/stable/c/7432376c913381c5f24d373a87ff629bbde94b47 |
| https://git.kernel.org/stable/c/4ef9ad19e17676b9ef071309bc62020e2373705d |
