CVE-2026-64548
bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
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.
INFO
Published Date :
July 27, 2026, 9:17 p.m.
Last Modified :
July 27, 2026, 9:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64548
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Add an overflow check before memory allocation.
- Apply the patch to the Linux kernel.
- Update the affected system to the patched version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64548.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64548 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64548
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64548 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64548 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'a12b1575f9feabd91695a9e9d004862f7195fa25', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '888706a76286c547bd035432602571e8024b5305', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'db77b6bb6e6edb79b10b4efcce346eec5582d588', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '4e40056bb5c829f0423f0a6694a0477726d2147e', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': 'bd004716ba75fed6d185795c85cdc92540ebeaab', 'versionType': 'git'}, {'status': 'affected', 'version': '6fff607e2f14bd7c63c06c464a6f93b8efbabe28', 'lessThan': '0c0a8ed85349dae298712d79cb276acfeb794d82', 'versionType': 'git'}], 'programFiles': ['net/core/filter.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/core/filter.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/0c0a8ed85349dae298712d79cb276acfeb794d82 Added Reference https://git.kernel.org/stable/c/4e40056bb5c829f0423f0a6694a0477726d2147e Added Reference https://git.kernel.org/stable/c/888706a76286c547bd035432602571e8024b5305 Added Reference https://git.kernel.org/stable/c/a12b1575f9feabd91695a9e9d004862f7195fa25 Added Reference https://git.kernel.org/stable/c/bd004716ba75fed6d185795c85cdc92540ebeaab Added Reference https://git.kernel.org/stable/c/db77b6bb6e6edb79b10b4efcce346eec5582d588 Added Reference https://git.kernel.org/stable/c/f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5 Added Reference https://git.kernel.org/stable/c/ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d