发布于3月6日3月6日 Members Amazon Linux 2023: CVE-2024-35872: Medium priority package update for kernel Severity 5 CVSS (AV:L/AC:L/Au:S/C:N/I:N/A:C) Published 05/19/2024 Created 02/14/2025 Added 02/14/2025 Modified 02/14/2025 Description In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix GUP-fast succeeding on secretmem folios folio_is_secretmem() currently relies on secretmem folios being LRU folios, to save some cycles. However, folios might reside in a folio batch without the LRU flag set, or temporarily have their LRU flag cleared.Consequently, the LRU flag is unreliable for this purpose. In particular, this is the case when secretmem_fault() allocates a fresh page and calls filemap_add_folio()->folio_add_lru().The folio might be added to the per-cpu folio batch and won't get the LRU flag set until the batch was drained using e.g., lru_add_drain(). Consequently, folio_is_secretmem() might not detect secretmem folios and GUP-fast can succeed in grabbing a secretmem folio, crashing the kernel when we would later try reading/writing to the folio, because the folio has been unmapped from the directmap. Fix it by removing that unreliable check. Solution(s) amazon-linux-2023-upgrade-bpftool amazon-linux-2023-upgrade-bpftool-debuginfo amazon-linux-2023-upgrade-kernel amazon-linux-2023-upgrade-kernel-debuginfo amazon-linux-2023-upgrade-kernel-debuginfo-common-aarch64 amazon-linux-2023-upgrade-kernel-debuginfo-common-x86-64 amazon-linux-2023-upgrade-kernel-devel amazon-linux-2023-upgrade-kernel-headers amazon-linux-2023-upgrade-kernel-libbpf amazon-linux-2023-upgrade-kernel-libbpf-devel amazon-linux-2023-upgrade-kernel-libbpf-static amazon-linux-2023-upgrade-kernel-livepatch-6-1-87-99-174 amazon-linux-2023-upgrade-kernel-modules-extra amazon-linux-2023-upgrade-kernel-modules-extra-common amazon-linux-2023-upgrade-kernel-tools amazon-linux-2023-upgrade-kernel-tools-debuginfo amazon-linux-2023-upgrade-kernel-tools-devel amazon-linux-2023-upgrade-perf amazon-linux-2023-upgrade-perf-debuginfo amazon-linux-2023-upgrade-python3-perf amazon-linux-2023-upgrade-python3-perf-debuginfo References https://attackerkb.com/topics/cve-2024-35872 CVE - 2024-35872 https://alas.aws.amazon.com/AL2023/ALAS-2024-613.html
