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NVD / CVE Program· CNA Linux

CVE-2026-53398: NFSD: Fix SECINFO_NO_NAME decode error cleanup

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.54% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 161d1aaeb04d620d3692639700512bb5038c1e10, 1e04be34cafae119e82bcaccd6d28a20f72a3647, 46eb17d45be69d28c7a23ea03283b207426a8232; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 161d1aaeb04d620d3692639700512bb5038c1e10, 1e04be34cafae119e82bcaccd6d28a20f72a3647, 46eb17d45be69d28c7a23ea03283b207426a8232; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"), the inline iops array is not cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore leave sin_exp holding stale union contents from a previous operation. The error response path still invokes nfsd4_secinfo_no_name_release(), which calls exp_put() on a non-NULL sin_exp. Initialize sin_exp before the first failable decode step, matching nfsd4_decode_secinfo().

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 45th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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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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 kernel5.10.220 and later · before 5.10.260
  • linux linux kernel5.15.154 and later · before 5.15.211
  • linux linux kernel6.1 and later · before 6.1.177
  • linux linux kernel6.2 and later · before 6.6.144
  • linux linux kernel6.7 and later · before 6.12.95
  • linux linux kernel6.13 and later · before 6.18.38
  • linux linux kernel6.19 and later · before 7.1.3

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

    • 6.1affected
    • 5e76b25d7cc82c148d391c0c43b884e6427cb302 and later · before 8836405abdc53ca3dd5fc68b2cf6f8f012fad011affected · git
    • 07b68ff5c71cf4ed5443016d8eb116863c0a4d88 and later · before 49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439affected · git
    • 3fdc546462348b8a497c72bc894e0cde9f10fc40 and later · before 5ec37edcb534f3fc92304be236d37f08e6545585affected · git
    • 3fdc546462348b8a497c72bc894e0cde9f10fc40 and later · before 1e04be34cafae119e82bcaccd6d28a20f72a3647affected · git
    • 3fdc546462348b8a497c72bc894e0cde9f10fc40 and later · before 161d1aaeb04d620d3692639700512bb5038c1e10affected · git
    • 3fdc546462348b8a497c72bc894e0cde9f10fc40 and later · before c8a24effd96d4779e2ad779654682304491c55a5affected · git
    • 3fdc546462348b8a497c72bc894e0cde9f10fc40 and later · before 46eb17d45be69d28c7a23ea03283b207426a8232affected · git
    • 3fdc546462348b8a497c72bc894e0cde9f10fc40 and later · before 9e18e83b8846a5c3fe13fc8a464b4865d33996c6affected · git
    • 5.10.220 and later · before 5.10.260affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.64.1.el10_26.12.0-211.64.1.el10_2

+96

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-2026-53394Jul 19, 2026 · nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race
    30Monitor
  • ← EarlierCVE-2026-53397Jul 19, 2026 · nfsd: fix posix_acl leak on SETACL decode failure
    30Monitor
  • Later →CVE-2026-53399Jul 19, 2026 · nfsd: release layout stid on setlease failure
    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 Linux161d1aaeb04d620d3692639700512bb5038c1e10Vendor (CNA)
Linux Linux1e04be34cafae119e82bcaccd6d28a20f72a3647Vendor (CNA)
Linux Linux46eb17d45be69d28c7a23ea03283b207426a8232Vendor (CNA)
Linux Linux49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439Vendor (CNA)
Linux Linux5.10.260Vendor (CNA)
Linux Linux5.15.211Vendor (CNA)
Linux Linux5ec37edcb534f3fc92304be236d37f08e6545585Vendor (CNA)
Linux Linux8836405abdc53ca3dd5fc68b2cf6f8f012fad011Vendor (CNA)
Linux Linux9e18e83b8846a5c3fe13fc8a464b4865d33996c6Vendor (CNA)
Linux Linuxc8a24effd96d4779e2ad779654682304491c55a5Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.64.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.56.1.el9_8 · AlmaLinux:9Package registry (OSV)

+20

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

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-2026-643686 days apartmm/slab: do not limit zeroing to orig_size when only red zoning is enabled
    32Monitor
  • CVE-2026-23253123 days apartmedia: dvb-core: fix wrong reinitialization of ringbuffer on reopen
    31Monitor
  • CVE-2025-71128186 days aparterspan: Initialize options_len before referencing options.
    22Monitor
  • CVE-2025-21906474 days apartwifi: iwlwifi: mvm: clean up ROC on failure
    22Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-665 · Improper Initialization

CVSS vector

CVSS:3.1/AV:N/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.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records