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NVD / CVE Program· CNA Linux

CVE-2026-31417: net/x25: Fix overflow when accumulating packets

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.44% (FIRST EPSS).
  • Anyone who can reach it over the internet 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 1734bd85c5e0a7a801295b729efb56b009cb8fc3, 4e2d1bcef78d21247fe8fef13bc7ed95885df2b5, 6e568835ea54a3e1d08e310e34f95d434e739477; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.134.1-2.

Low priority for now. Upgrade to Linux Linux 1734bd85c5e0a7a801295b729efb56b009cb8fc3, 4e2d1bcef78d21247fe8fef13bc7ed95885df2b5, 6e568835ea54a3e1d08e310e34f95d434e739477; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.134.1-2 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: net/x25: Fix overflow when accumulating packets Add a check to ensure that `x25_sock.fraglen` does not overflow. The `fraglen` also needs to be resetted when purging `fragment_queue` in `x25_clear_queues()`.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Apr 13, 2026
Updated
Oct 15, 2026
EPSS
0.4% · 39th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-31417

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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.12.1 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel2.6.12
  • linux linux kernel7.0

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 96fc16370b0bceb289c7e0479bd0540b81e257aaaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 798d613afb64b01a203f448fb0f43c37c6afe79daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6e568835ea54a3e1d08e310e34f95d434e739477affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1734bd85c5e0a7a801295b729efb56b009cb8fc3affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4e2d1bcef78d21247fe8fef13bc7ed95885df2b5affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8c92969c197b91c134be27dc3afb64ab468853a9affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f953f11ccf4afe6feb635c08145f4240d9a6b544affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a1822cb524e89b4cd2cf0b82e484a2335496a6d9affected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31415Apr 13, 2026 · ipv6: avoid overflows in ip6_datagram_send_ctl()
    22Monitor
  • ← EarlierCVE-2026-31416Apr 13, 2026 · netfilter: nfnetlink_log: account for netlink header size
    22Monitor
  • Later →CVE-2026-31418Apr 13, 2026 · netfilter: ipset: drop logically empty buckets in mtype_del
    22Monitor

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 Linux1734bd85c5e0a7a801295b729efb56b009cb8fc3Vendor (CNA)
Linux Linux4e2d1bcef78d21247fe8fef13bc7ed95885df2b5Vendor (CNA)
Linux Linux6e568835ea54a3e1d08e310e34f95d434e739477Vendor (CNA)
Linux Linux798d613afb64b01a203f448fb0f43c37c6afe79dVendor (CNA)
Linux Linux8c92969c197b91c134be27dc3afb64ab468853a9Vendor (CNA)
Linux Linux96fc16370b0bceb289c7e0479bd0540b81e257aaVendor (CNA)
Linux Linuxa1822cb524e89b4cd2cf0b82e484a2335496a6d9Vendor (CNA)
Linux Linuxf953f11ccf4afe6feb635c08145f4240d9a6b544Vendor (CNA)
azl3 kernel 6.6.130.1-3 on Azure Linux 3.06.6.134.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.170-1 · 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.

  • CVE-2026-5317673 days apartIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
    39Monitor
  • CVE-2026-6394097 days apartKVM: SEV: Ignore Port I/O requests of length '0'
    37Monitor
  • CVE-2026-4318723 days apartxfs: delete attr leaf freemap entries when empty
    35Monitor
  • CVE-2026-5317873 days apartstaging: rtl8723bs: rtw_mlme: add bounds checks before ie_length subtraction
    32Monitor
  • CVE-2026-3165611 days apartdrm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat
    31Monitor
  • CVE-2026-4610745 days apartdm-thin: fix metadata refcount underflow
    31Monitor

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

Attack conditions

  • Anyone who can reach it over the internet 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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-191 · Integer Underflow (Wrap or Wraparound)

CVSS vector

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

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 (10 more)

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

All records