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NVD / CVE Program· CNA Linux

CVE-2026-74391: tracing: Bound synthetic-field strings with seq_buf

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0c584c27f6649a93ec12061cc779a4bd8f7c1434, 88b901fdc1662b131ff908cbd017333b61e7acc8, 9f8ef2e1e95a42044e614b0a5277e3f53f545135.

Low priority for now. Upgrade to Linux Linux 0c584c27f6649a93ec12061cc779a4bd8f7c1434, 88b901fdc1662b131ff908cbd017333b61e7acc8, 9f8ef2e1e95a42044e614b0a5277e3f53f545135 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: tracing: Bound synthetic-field strings with seq_buf The synthetic field helpers build a prefixed synthetic variable name and a generated hist command in fixed MAX_FILTER_STR_VAL buffers. The current code appends those strings with raw strcat(), so long key lists, field names, or saved filters can run past the end of the staging buffers. Build both strings with seq_buf and propagate -E2BIG if either the synthetic variable name or the generated command exceeds MAX_FILTER_STR_VAL. This keeps the existing tracing-side limit while using the helper intended for bounded command construction. [ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ]

—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 6th 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 · 0.1%

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Noroxi analysis

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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

    • 4.17affected
    • 02205a6752f223779a1b0e9e8ffacbea6e717851 and later · before 9f8ef2e1e95a42044e614b0a5277e3f53f545135affected · git
    • 02205a6752f223779a1b0e9e8ffacbea6e717851 and later · before 0c584c27f6649a93ec12061cc779a4bd8f7c1434affected · git
    • 02205a6752f223779a1b0e9e8ffacbea6e717851 and later · before 88b901fdc1662b131ff908cbd017333b61e7acc8affected · git
    • 02205a6752f223779a1b0e9e8ffacbea6e717851 and later · before baa333b2700a7fa3529d504529c8c10060fd687caffected · git
    • 02205a6752f223779a1b0e9e8ffacbea6e717851 and later · before cf334620036ad2250e008c7e7bb6646a3938b7b0affected · git
    • 02205a6752f223779a1b0e9e8ffacbea6e717851 and later · before f07883450eb14d1cf020b55d9f3a7ec5683bcd26affected · git
    • before 4.17not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.145 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
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-2026-74389Aug 15, 2026 · RDMA/hns: Fix log flood after cmd_mbox failure
    0Monitor
  • ← EarlierCVE-2026-74390Aug 15, 2026 · RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs
    31Monitor
  • Later →CVE-2026-74394Aug 15, 2026 · RDMA/srpt: fix integer overflow in immediate data length check
    39Monitor

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 Linux0c584c27f6649a93ec12061cc779a4bd8f7c1434Vendor (CNA)
Linux Linux88b901fdc1662b131ff908cbd017333b61e7acc8Vendor (CNA)
Linux Linux9f8ef2e1e95a42044e614b0a5277e3f53f545135Vendor (CNA)
Linux Linuxbaa333b2700a7fa3529d504529c8c10060fd687cVendor (CNA)
Linux Linuxcf334620036ad2250e008c7e7bb6646a3938b7b0Vendor (CNA)
Linux Linuxf07883450eb14d1cf020b55d9f3a7ec5683bcd26Vendor (CNA)
debian:linux6.12.100-1 · Debian:13Package 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

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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 (5 more)

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

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