CVE-2026-64548

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Buffer Overflow in Linux Kernel BPF sockmap

Publication date: 2026-07-27

Last updated on: 2026-11-03

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data() When the scatterlist ring is full or nearly full, bpf_msg_push_data() enters a copy fallback path and computes copy + len for the page allocation size. Since len comes from BPF with arg3_type = ARG_ANYTHING and both are u32, a crafted len can wrap the sum to a small value, causing an undersized allocation followed by an out-of-bounds memcpy. BUG: unable to handle page fault for address: ffffed104089a402 Oops: Oops: 0000 [#1] SMP KASAN NOPTI Call Trace: __asan_memcpy (mm/kasan/shadow.c:105) bpf_msg_push_data (net/core/filter.c:2852 net/core/filter.c:2788) bpf_prog_9ed8b5711920a7d7+0x2e/0x36 sk_psock_msg_verdict (net/core/skmsg.c:934) tcp_bpf_sendmsg (net/ipv4/tcp_bpf.c:421 net/ipv4/tcp_bpf.c:584) __sys_sendto (net/socket.c:2206) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Add an overflow check before the allocation.

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Meta Information

Published

2026-07-27

Last Modified

2026-11-03

Generated

2026-11-08

AI Q&A

2026-07-28

EPSS Evaluated

2026-11-07

NVD

CVE-2026-64548

EUVD

EUVD-2026-49599

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This is a Linux kernel vulnerability in the BPF (Berkeley Packet Filter) sockmap functionality. It involves a flaw in the bpf_msg_push_data() function where a crafted input can cause an integer overflow, leading to an undersized memory allocation. This triggers an out-of-bounds memory write during a memcpy operation, potentially causing a kernel crash or arbitrary code execution.

Detection Guidance

This vulnerability is specific to the Linux kernel's BPF and sockmap functionality. Detection requires checking for kernel logs indicating page faults or Oops related to bpf_msg_push_data. Monitor system logs for KASAN errors or crashes in the BPF subsystem. No direct commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could allow an attacker to crash the system, execute arbitrary code with kernel privileges, or bypass security mechanisms. It primarily affects systems using BPF sockmap features, which are often used in networking and packet processing applications.

Compliance Impact

This vulnerability could potentially lead to unauthorized memory access or data leaks, which may impact compliance with data protection regulations like GDPR or HIPAA if exploited in systems handling sensitive data.

Mitigation Strategies

Apply the kernel patch that adds an overflow check before allocation in bpf_msg_push_data. Update to a patched kernel version. If immediate patching is not possible, disable BPF and sockmap features as a temporary workaround.

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