NFSD: prevent underflow in nfssvc_decode_writeargs()
Noroxi assessment
Priority: Monitor (action score 22/100)
- 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: 0.68% (FIRST EPSS); higher than 51.7% of all records.
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 184416d4b98509fb4c3d8fc3d6dc1437896cc159, 2764af8ce0bf03cc43ee4a11897cab96bde6caae, 413d8fefafe531a9442bb623e3fe292a38f88d65.
- Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 5.5.
Low priority for now. Upgrade to Linux Linux 184416d4b98509fb4c3d8fc3d6dc1437896cc159, 2764af8ce0bf03cc43ee4a11897cab96bde6caae, 413d8fefafe531a9442bb623e3fe292a38f88d65 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: prevent underflow in nfssvc_decode_writeargs() Smatch complains: fs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs() warn: no lower bound on 'args->len' Change the type to unsigned to prevent this issue.
- Published
- Feb 26, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.6% · 51th percentile
- CWE
- CWE-191
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 9.8
- 4.3 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernelbefore 4.9.311
- linux linux kernel4.10 and later · before 4.14.276
- linux linux kernel4.15 and later · before 4.19.238
- linux linux kernel4.20 and later · before 5.4.189
- linux linux kernel5.5 and later · before 5.10.110
- linux linux kernel5.11 and later · before 5.15.33
- linux linux kernel5.16 and later · before 5.16.19
- linux linux kernel5.17 and later · before 5.17.2
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
- 5.12affected
- a51b5b737a0be93fae6ea2a18df03ab2359a3f4b and later · before 614a61e1592051cc42d3c38f899c9f7bdaad8a1daffected · git
- a51b5b737a0be93fae6ea2a18df03ab2359a3f4b and later · before 2764af8ce0bf03cc43ee4a11897cab96bde6caaeaffected · git
- a51b5b737a0be93fae6ea2a18df03ab2359a3f4b and later · before 413d8fefafe531a9442bb623e3fe292a38f88d65affected · git
- a51b5b737a0be93fae6ea2a18df03ab2359a3f4b and later · before 184416d4b98509fb4c3d8fc3d6dc1437896cc159affected · git
- before 5.12not affected · semver
- 5.15.33 and later · up to and including 5.15.*not affected · semver
- 5.16.19 and later · up to and including 5.16.*not affected · semver
- 5.17.2 and later · up to and including 5.17.*not affected · semver
- 5.18 and laternot affected · original_commit_for_fix
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 5.17.3-1 | 5.17.3-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 184416d4b98509fb4c3d8fc3d6dc1437896cc159 | Vendor (CNA) |
| Linux Linux | 2764af8ce0bf03cc43ee4a11897cab96bde6caae | Vendor (CNA) |
| Linux Linux | 413d8fefafe531a9442bb623e3fe292a38f88d65 | Vendor (CNA) |
| Linux Linux | 614a61e1592051cc42d3c38f899c9f7bdaad8a1d | Vendor (CNA) |
| debian:linux | 5.17.3-1 · Debian:12 | Package 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.
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 researchersFinders, 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-2026-53176484 days apartIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN39Monitor
- CVE-2024-26828315 days apartcifs: fix underflow in parse_server_interfaces()37Monitor
- CVE-2026-43187434 days apartxfs: delete attr leaf freemap entries when empty35Monitor
- CVE-2026-53178484 days apartstaging: rtl8723bs: rtw_mlme: add bounds checks before ie_length subtraction32Monitor
- CVE-2024-5306199 days apartmedia: s5p-jpeg: prevent buffer overflows31Monitor
- CVE-2024-46759161 days aparthwmon: (adc128d818) Fix underflows seen when writing limit attributes31Monitor
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
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- 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
- Local
- Attack complexity
- Low
- Privileges required
- Low
- 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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (3 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.