| 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-2024-41055: mm: prevent derefencing NULL ptr in pfn_section_valid() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mm: prevent derefencing NULL ptr in pfn_section_valid() |
| |
| Commit 5ec8e8ea8b77 ("mm/sparsemem: fix race in accessing |
| memory_section->usage") changed pfn_section_valid() to add a READ_ONCE() |
| call around "ms->usage" to fix a race with section_deactivate() where |
| ms->usage can be cleared. The READ_ONCE() call, by itself, is not enough |
| to prevent NULL pointer dereference. We need to check its value before |
| dereferencing it. |
| |
| The Linux kernel CVE team has assigned CVE-2024-41055 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10.210 with commit 90ad17575d26874287271127d43ef3c2af876cea and fixed in 5.10.222 with commit 0100aeb8a12d51950418e685f879cc80cb8e5982 |
| Issue introduced in 5.15.149 with commit b448de2459b6d62a53892487ab18b7d823ff0529 and fixed in 5.15.163 with commit bc17f2377818dca643a74499c3f5333500c90503 |
| Issue introduced in 6.1.76 with commit 68ed9e33324021e9d6b798e9db00ca3093d2012a and fixed in 6.1.100 with commit 941e816185661bf2b44b488565d09444ae316509 |
| Issue introduced in 6.6.15 with commit 70064241f2229f7ba7b9599a98f68d9142e81a97 and fixed in 6.6.41 with commit 797323d1cf92d09b7a017cfec576d9babf99cde7 |
| Issue introduced in 6.8 with commit 5ec8e8ea8b7783fab150cf86404fc38cb4db8800 and fixed in 6.9.10 with commit adccdf702b4ea913ded5ff512239e382d7473b63 |
| Issue introduced in 6.8 with commit 5ec8e8ea8b7783fab150cf86404fc38cb4db8800 and fixed in 6.10 with commit 82f0b6f041fad768c28b4ad05a683065412c226e |
| Issue introduced in 6.7.3 with commit 3a01daace71b521563c38bbbf874e14c3e58adb7 |
| |
| 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-2024-41055 |
| 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/mmzone.h |
| |
| |
| 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/0100aeb8a12d51950418e685f879cc80cb8e5982 |
| https://git.kernel.org/stable/c/bc17f2377818dca643a74499c3f5333500c90503 |
| https://git.kernel.org/stable/c/941e816185661bf2b44b488565d09444ae316509 |
| https://git.kernel.org/stable/c/797323d1cf92d09b7a017cfec576d9babf99cde7 |
| https://git.kernel.org/stable/c/adccdf702b4ea913ded5ff512239e382d7473b63 |
| https://git.kernel.org/stable/c/82f0b6f041fad768c28b4ad05a683065412c226e |
