CVE-2026-98031: nexthop: Initialize extack in remove_nh_grp_entry()
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 030c878eaedf0449e2b5401a0a0146d0afcc645e, 17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a, 35d9ec61466109ef0c2de87067338d929f629527; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 030c878eaedf0449e2b5401a0a0146d0afcc645e, 17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a, 35d9ec61466109ef0c2de87067338d929f629527; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: nexthop: Initialize extack in remove_nh_grp_entry() remove_nh_grp_entry() prints the extack message when a listener fails to replace the reduced nexthop group. However, extack is not initialized and listeners are not required to set a message when returning an error. Neither netdevsim nor mlxsw do so when an allocation fails, resulting in the dereference of an uninitialized stack pointer. Fix by zero-initializing extack, as was done in commit 6347c5314cee ("nexthop: initialize extack in nh_res_bucket_migrate()").
- Published
- Sep 25, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.1% · 6th percentile
- CWE
- —
Report tools
Action score
0
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
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.
Is your version affected? Check itNoroxi 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.
—
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
- 5.11affected
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before 35d9ec61466109ef0c2de87067338d929f629527affected · git
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before 704319510af2179cf03955747d714ab291075c25affected · git
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before 17acbcd4c5a6ca3dd3f9e52eb203c9175bde609aaffected · git
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before 030c878eaedf0449e2b5401a0a0146d0afcc645eaffected · git
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before d643cea4248668dc493c513aa7cbc6505eb1a4a9affected · git
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before d80677ad7aa5bebfccfd58caa4852b65abe70561affected · git
- 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 and later · before 5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55baffected · git
- before 5.11not affected · semver
- 5.15.222 and later · up to and including 5.15.*not affected · semver
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 6.1.190-1 | 6.1.190-1 |
| Debian:12 | linux-6.12 | before 6.12.111-1~deb12u1 | 6.12.111-1~deb12u1 |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.7-1 | 7.2.7-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-98029Sep 25, 2026 · eth: nfp: bound the ntuple rule dump by the caller's buffer size28Monitor
- ← EarlierCVE-2026-98030Sep 25, 2026 · net: dsa: bcm_sf2: bound the CFP rule dump by the caller's buffer size28Monitor
- Later →CVE-2026-98032Sep 25, 2026 · tracing: Fix subbuf resize races with trace_pipe_raw readers0Monitor
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 | 030c878eaedf0449e2b5401a0a0146d0afcc645e | Vendor (CNA) |
| Linux Linux | 17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a | Vendor (CNA) |
| Linux Linux | 35d9ec61466109ef0c2de87067338d929f629527 | Vendor (CNA) |
| Linux Linux | 5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b | Vendor (CNA) |
| Linux Linux | 704319510af2179cf03955747d714ab291075c25 | Vendor (CNA) |
| Linux Linux | d643cea4248668dc493c513aa7cbc6505eb1a4a9 | Vendor (CNA) |
| Linux Linux | d80677ad7aa5bebfccfd58caa4852b65abe70561 | Vendor (CNA) |
| azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 | 6.6.158.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.190-1 · Debian:12 | Package registry (OSV) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.111-1~deb12u1 · 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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-1184 · Sep 28, 2026(Linux Kernel Güvenlik Bildirimi)
Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
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✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a
- git.kernel.org/stable/c/35d9ec61466109ef0c2de87067338d929f629527
- git.kernel.org/stable/c/5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b
- git.kernel.org/stable/c/704319510af2179cf03955747d714ab291075c25
- git.kernel.org/stable/c/d643cea4248668dc493c513aa7cbc6505eb1a4a9
- git.kernel.org/stable/c/d80677ad7aa5bebfccfd58caa4852b65abe70561
Vendor advisories and official records. Exploit/PoC links are deliberately left out.