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NVD / CVE Program· CNA Linux

CVE-2026-64548: bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()

Noroxi assessment

Priority: Monitor (action score 33/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0c0a8ed85349dae298712d79cb276acfeb794d82, 4e40056bb5c829f0423f0a6694a0477726d2147e, 888706a76286c547bd035432602571e8024b5305.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0c0a8ed85349dae298712d79cb276acfeb794d82, 4e40056bb5c829f0423f0a6694a0477726d2147e, 888706a76286c547bd035432602571e8024b5305 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.4 · v3.1—No exploit Fix available
Published
Jul 27, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.4
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2026-64548

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.20affected
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5affected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before a12b1575f9feabd91695a9e9d004862f7195fa25affected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before ff39d0e3b4feeb65ca43c453d7c75fdf872ded0daffected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before 888706a76286c547bd035432602571e8024b5305affected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before db77b6bb6e6edb79b10b4efcce346eec5582d588affected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before 4e40056bb5c829f0423f0a6694a0477726d2147eaffected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before bd004716ba75fed6d185795c85cdc92540ebeaabaffected · git
    • 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 and later · before 0c0a8ed85349dae298712d79cb276acfeb794d82affected · git
    • before 4.20not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-64546Jul 27, 2026 · drm/edid: fix OOB read in drm_parse_tiled_block()
    28Monitor
  • ← EarlierCVE-2026-64547Jul 27, 2026 · net: usb: net1080: validate packet_len before pad-byte access in rx_fixup
    32Monitor
  • Later →CVE-2026-64551Jul 27, 2026 · sctp: validate STALE_COOKIE cause length before reading staleness
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0c0a8ed85349dae298712d79cb276acfeb794d82Vendor (CNA)
Linux Linux4e40056bb5c829f0423f0a6694a0477726d2147eVendor (CNA)
Linux Linux888706a76286c547bd035432602571e8024b5305Vendor (CNA)
Linux Linuxa12b1575f9feabd91695a9e9d004862f7195fa25Vendor (CNA)
Linux Linuxbd004716ba75fed6d185795c85cdc92540ebeaabVendor (CNA)
Linux Linuxdb77b6bb6e6edb79b10b4efcce346eec5582d588Vendor (CNA)
Linux Linuxf1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5Vendor (CNA)
Linux Linuxff39d0e3b4feeb65ca43c453d7c75fdf872ded0dVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-639848 days apartipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
    39Monitor
  • CVE-2026-6815814 days apartlibceph: Fix multiplication overflow in decode_new_up_state_weight()
    39Monitor
  • CVE-2026-7201419 days apartdrbd: reject data replies with an out-of-range payload size
    39Monitor
  • CVE-2025-68794195 days apartiomap: adjust read range correctly for non-block-aligned positions
    39Monitor
  • CVE-2026-645222 days apartnet/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA
    35Monitor
  • CVE-2026-6459810 days apartsmb/client: Fix error code in smb2_aead_req_alloc()
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records