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NVD / CVE Program· CNA Linux

CVE-2026-63860: RDMA/core: Prefer NLA_NUL_STRING

HighCVSS 8.4 · v3.1—No exploit Fix available

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: 0.18% (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 137b5918931d4d05aa8ea8d3adf67f7224eef63c, 5877c043398d5fa0e93919a3d837e5cd7a98a961, 6ed3d14fc45d3da6025e7fe4a6a09066856698e2.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 137b5918931d4d05aa8ea8d3adf67f7224eef63c, 5877c043398d5fa0e93919a3d837e5cd7a98a961, 6ed3d14fc45d3da6025e7fe4a6a09066856698e2 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: RDMA/core: Prefer NLA_NUL_STRING These attributes are evaluated as c-string (passed to strcmp), but NLA_STRING doesn't check for the presence of a \0 terminator. Either this needs to switch to nla_strcmp() and needs to adjust printf fmt specifier to not use plain %s, or this needs to use NLA_NUL_STRING. As the code has been this way for long time, it seems to me that userspace does include the terminating nul, even tough its not enforced so far, and thus NLA_NUL_STRING use is the simpler solution.

Published
Jul 19, 2026
Updated
Oct 23, 2026
EPSS
0.1% · 7th 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.

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  • 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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  • when exploit code appears or is weaponized
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  • 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

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

    • 3.16affected
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdfaffected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before 87111356d58d86edb221ba144d261ed83a5b8bbeaffected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before abda65bdd13084c771842adaac1f652d0660dd82affected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before 137b5918931d4d05aa8ea8d3adf67f7224eef63caffected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before 5877c043398d5fa0e93919a3d837e5cd7a98a961affected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before f2c7b39dde2e61df8157066969cc2a408cd3dcd9affected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before c26a0052cceed4c4d380ee5808b699f937fb58d8affected · git
    • 30dc5e63d6a5ad24894b5512d10b228d73645a44 and later · before 6ed3d14fc45d3da6025e7fe4a6a09066856698e2affected · git
    • before 3.16not affected · semver
Affected versions · NVD (7)

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

  • linux linux kernel3.16 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.141
  • linux linux kernel6.7 and later · before 6.12.91
  • linux linux kernel6.13 and later · before 6.18.33
  • linux linux kernel6.19 and later · before 7.0.10

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.10-17.0.10-1

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-2026-63858Jul 19, 2026 · netfilter: nf_tables: add hook transactions for device deletions
    31Monitor
  • ← EarlierCVE-2026-63859Jul 19, 2026 · net: airoha: Add missing bits in airoha_qdma_cleanup_tx_queue()
    22Monitor
  • Later →CVE-2026-63861Jul 19, 2026 · spi: mtk-snfi: unregister ECC engine on probe failure and remove() callback
    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 Linux137b5918931d4d05aa8ea8d3adf67f7224eef63cVendor (CNA)
Linux Linux5877c043398d5fa0e93919a3d837e5cd7a98a961Vendor (CNA)
Linux Linux6ed3d14fc45d3da6025e7fe4a6a09066856698e2Vendor (CNA)
Linux Linux87111356d58d86edb221ba144d261ed83a5b8bbeVendor (CNA)
Linux Linuxabda65bdd13084c771842adaac1f652d0660dd82Vendor (CNA)
Linux Linuxc26a0052cceed4c4d380ee5808b699f937fb58d8Vendor (CNA)
Linux Linuxf2c7b39dde2e61df8157066969cc2a408cd3dcd9Vendor (CNA)
Linux Linuxfcd07d3b8ee7a39b344d73aed69c1a68cd9eacdfVendor (CNA)
debian:linux6.1.176-1 · 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.

EPSS, last 120 days

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

Variant candidates

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

  • CVE-2026-4302879 days apartnetfilter: x_tables: ensure names are nul-terminated
    28Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

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-170 · Improper Null Termination

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.

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

References

Show all references (7 more)

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

All records