bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64548
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-27 21:17:07 UTC
Updated2026-07-30 06:25:58 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001440000 probability, percentile 0.041510000 (date 2026-07-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 a12b1575f9feabd91695a9e9d004862f7195fa25 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 888706a76286c547bd035432602571e8024b5305 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 db77b6bb6e6edb79b10b4efcce346eec5582d588 git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 4e40056bb5c829f0423f0a6694a0477726d2147e git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 bd004716ba75fed6d185795c85cdc92540ebeaab git Not specified
CNA Linux Linux affected 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 0c0a8ed85349dae298712d79cb276acfeb794d82 git Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0c0a8ed85349dae298712d79cb276acfeb794d82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db77b6bb6e6edb79b10b4efcce346eec5582d588 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a12b1575f9feabd91695a9e9d004862f7195fa25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e40056bb5c829f0423f0a6694a0477726d2147e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/888706a76286c547bd035432602571e8024b5305 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd004716ba75fed6d185795c85cdc92540ebeaab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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