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NVD / CVE Program· CNA Linux

CVE-2025-40278: net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak

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: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 2191662058443e0bcc28d11694293d8339af6dde, 37f0680887c5aeba9a433fe04b35169010568bb1, 5e3644ef147bf7140259dfa4cace680c9b26fe8b.

Low priority for now. Upgrade to Linux Linux 2191662058443e0bcc28d11694293d8339af6dde, 37f0680887c5aeba9a433fe04b35169010568bb1, 5e3644ef147bf7140259dfa4cace680c9b26fe8b 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: net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak Fix a KMSAN kernel-infoleak detected by the syzbot . [net?] KMSAN: kernel-infoleak in __skb_datagram_iter In tcf_ife_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace. Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied. This change silences the KMSAN report and prevents potential information leaks from the kernel memory. This fix has been tested and validated by syzbot. This patch closes the bug reported at the following syzkaller link and ensures no infoleak.

—No exploit Fix available
Published
Dec 6, 2025
Updated
Oct 15, 2026
EPSS
0.2% · 14th 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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Noroxi analysis

What does it mean in your environment?

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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

    • 4.6affected
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before 918e063304f945fb93be9bb70cacea07d0b730eaaffected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before 5e3644ef147bf7140259dfa4cace680c9b26fe8baffected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before 37f0680887c5aeba9a433fe04b35169010568bb1affected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before 2191662058443e0bcc28d11694293d8339af6ddeaffected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before a676a296af65d33725bdf7396803180957dbd92eaffected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before d1dbbbe839647486c9b893e5011fe84a052962dfaffected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before c8f51dad94cbb88054e2aacc272b3ce1ed11fb1eaffected · git
    • ef6980b6becb1afd9d82a4f043749a10ae81bf14 and later · before ce50039be49eea9b4cd8873ca6eccded1b4a130aaffected · git
    • before 4.6not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.9-16.17.9-1

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-2025-40276Dec 6, 2025 · drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
    29Monitor
  • ← EarlierCVE-2025-40277Dec 6, 2025 · drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE
    31Monitor
  • Later →CVE-2025-40279Dec 6, 2025 · net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
    0Monitor

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 Linux2191662058443e0bcc28d11694293d8339af6ddeVendor (CNA)
Linux Linux37f0680887c5aeba9a433fe04b35169010568bb1Vendor (CNA)
Linux Linux5e3644ef147bf7140259dfa4cace680c9b26fe8bVendor (CNA)
Linux Linux918e063304f945fb93be9bb70cacea07d0b730eaVendor (CNA)
Linux Linuxa676a296af65d33725bdf7396803180957dbd92eVendor (CNA)
Linux Linuxc8f51dad94cbb88054e2aacc272b3ce1ed11fb1eVendor (CNA)
Linux Linuxce50039be49eea9b4cd8873ca6eccded1b4a130aVendor (CNA)
Linux Linuxd1dbbbe839647486c9b893e5011fe84a052962dfVendor (CNA)
debian:linux6.1.159-1 · 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✗ → ✓

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References

Show all references (8 more)

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

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