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NVD / CVE Program· CNA Linux

CVE-2025-40078: bpf: Explicitly check accesses to bpf_sock_addr

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.24% (FIRST EPSS).
  • Fixed version: Linux Linux 4f00858cd9bbbdf67159e28b85a8ca9e77c83622, 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec, 6fabca2fc94d33cdf7ec102058983b086293395f; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2.

Low priority for now. Upgrade to Linux Linux 4f00858cd9bbbdf67159e28b85a8ca9e77c83622, 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec, 6fabca2fc94d33cdf7ec102058983b086293395f; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2 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: Explicitly check accesses to bpf_sock_addr Syzkaller found a kernel warning on the following sock_addr program: 0: r0 = 0 1: r2 = *(u32 *)(r1 +60) 2: exit which triggers: verifier bug: error during ctx access conversion (0) This is happening because offset 60 in bpf_sock_addr corresponds to an implicit padding of 4 bytes, right after msg_src_ip4. Access to this padding isn't rejected in sock_addr_is_valid_access and it thus later fails to convert the access. This patch fixes it by explicitly checking the various fields of bpf_sock_addr in sock_addr_is_valid_access. I checked the other ctx structures and is_valid_access functions and didn't find any other similar cases. Other cases of (properly handled) padding are covered in new tests in a subsequent patch.

—No exploit Fix available
Published
Oct 28, 2025
Updated
Nov 10, 2026
EPSS
0.2% · 15th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • No public exploit code on record
  • A fix has been released

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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

    • 4.18affected
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before de44cdc50d2dce8718cb57deddf9cf1be9a7759faffected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before 76e04bbb4296fb6eac084dbfc27e02ccc744db3eaffected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ecaffected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before 4f00858cd9bbbdf67159e28b85a8ca9e77c83622affected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before cdeafacb4f9ff261a96baef519e29480fd7b1019affected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before fe9d33f0470350558cb08cecb54cf2267b3a45d2affected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69affected · git
    • 1cedee13d25ab118d325f95588c1a084e9317229 and later · before 6fabca2fc94d33cdf7ec102058983b086293395faffected · git
    • before 4.18not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

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-2025-40076Oct 28, 2025 · PCI: rcar-host: Pass proper IRQ domain to generic_handle_domain_irq()
    0Monitor
  • ← EarlierCVE-2025-40077Oct 28, 2025 · f2fs: fix to avoid overflow while left shift operation
    0Monitor
  • Later →CVE-2025-40079Oct 28, 2025 · riscv, bpf: Sign extend struct ops return values properly
    31Monitor

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 Linux4f00858cd9bbbdf67159e28b85a8ca9e77c83622Vendor (CNA)
Linux Linux6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ecVendor (CNA)
Linux Linux6fabca2fc94d33cdf7ec102058983b086293395fVendor (CNA)
Linux Linux76e04bbb4296fb6eac084dbfc27e02ccc744db3eVendor (CNA)
Linux Linuxad8b4fe5617e3c85fc23267f02500c4f3bf0ff69Vendor (CNA)
Linux Linuxcdeafacb4f9ff261a96baef519e29480fd7b1019Vendor (CNA)
Linux Linuxde44cdc50d2dce8718cb57deddf9cf1be9a7759fVendor (CNA)
Linux Linuxfe9d33f0470350558cb08cecb54cf2267b3a45d2Vendor (CNA)
azl3 kernel 6.6.104.2-4 on Azure Linux 3.06.6.112.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.158-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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.

No nightly-computed relations.

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).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (9 more)

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

All records