发布于3月6日3月6日 Members Amazon Linux AMI 2: CVE-2021-47376: Security patch for kernel (ALASKERNEL-5.10-2022-007) Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/21/2024 Created 12/13/2024 Added 12/12/2024 Modified 12/12/2024 Description In the Linux kernel, the following vulnerability has been resolved: bpf: Add oversize check before call kvcalloc() Commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls") add the oversize check. When the allocation is larger than what kmalloc() supports, the following warning triggered: WARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597 Modules linked in: CPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597 Call Trace: kvmalloc include/linux/mm.h:806 [inline] kvmalloc_array include/linux/mm.h:824 [inline] kvcalloc include/linux/mm.h:829 [inline] check_btf_line kernel/bpf/verifier.c:9925 [inline] check_btf_info kernel/bpf/verifier.c:10049 [inline] bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759 bpf_prog_load kernel/bpf/syscall.c:2301 [inline] __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Solution(s) amazon-linux-ami-2-upgrade-bpftool amazon-linux-ami-2-upgrade-bpftool-debuginfo amazon-linux-ami-2-upgrade-kernel amazon-linux-ami-2-upgrade-kernel-debuginfo amazon-linux-ami-2-upgrade-kernel-debuginfo-common-aarch64 amazon-linux-ami-2-upgrade-kernel-debuginfo-common-x86_64 amazon-linux-ami-2-upgrade-kernel-devel amazon-linux-ami-2-upgrade-kernel-headers amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-75-79-358 amazon-linux-ami-2-upgrade-kernel-tools amazon-linux-ami-2-upgrade-kernel-tools-debuginfo amazon-linux-ami-2-upgrade-kernel-tools-devel amazon-linux-ami-2-upgrade-perf amazon-linux-ami-2-upgrade-perf-debuginfo amazon-linux-ami-2-upgrade-python-perf amazon-linux-ami-2-upgrade-python-perf-debuginfo References https://attackerkb.com/topics/cve-2021-47376 AL2/ALASKERNEL-5.10-2022-007 CVE - 2021-47376
