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NVD / CVE Program· CNA Linux

CVE-2026-98025: net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow

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: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 00520cdd21ea6a9b5dc8d53bbd241620d2059554, 0dbc89e664b4609ad672b5bdeef60df251294b8f, 237c9ae7145772af147e4665f158938350fa5658; 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 00520cdd21ea6a9b5dc8d53bbd241620d2059554, 0dbc89e664b4609ad672b5bdeef60df251294b8f, 237c9ae7145772af147e4665f158938350fa5658; 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: net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow The 0xffff length sentinel detects a router reboot and schedules re-enabling of ethernet mode, but then falls through to the rest of the loop body. The next check is } else if (len > CX82310_MTU) { which is the else of the just-matched if -- it never fires for len == 0xffff. The MTU bound that normally caps the incomplete-packet save path is silently bypassed. With 0xffff > skb->len always true (rx_urb_size is 4096), the incomplete-packet branch saves dev->partial_len = skb->len bytes into dev->partial_data. partial_data is kmalloc(hard_mtu) = kmalloc(CX82310_MTU + 2) = 1516 bytes, but skb->len after the 2-byte header pull can be up to 4094. A device that sends a 4096-byte URB starting with [0xff 0xff] therefore copies 4094 device-provided bytes into a buffer allocated for 1516 bytes, exceeding its requested size by 2578 bytes. The next URB then reads dev->partial_len (4094) back from the same 1516-byte buffer and dev->partial_rem (65535 - 4094 = 61441) from the new URB's ~4KB skb, both well past their allocations, and delivers the spliced result as a 64KB "frame" to the network stack. Bail out of rx_fixup after scheduling the re-enable work; the remainder of a reboot-marker URB is not meaningful packet data. This restores the invariant that partial_len < CX82310_MTU + 2 on the save path, since every other route there has already passed the MTU check.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 14th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

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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.

—

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

    • 5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb, c1b187a86a176e42f5e48066556980e3232b6cab, 5.10affected
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before d0c1ce6ef4cefe568e19afa83f543caa3c3c0873affected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 0dbc89e664b4609ad672b5bdeef60df251294b8faffected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 00520cdd21ea6a9b5dc8d53bbd241620d2059554affected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 59bf9e94bdc49557f07d87164269daff7340f4d6affected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287affected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 659654654eb140851467af41d610473c100c7975affected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 237c9ae7145772af147e4665f158938350fa5658affected · git
    • ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and later · before 5d50e90add8b4a978395e893e81954d19d58a7c5affected · git
    • 4.19.322 and later · before 4.20affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98023Sep 25, 2026 · vxlan: reject dynamic fdb entries that reference a nexthop id
    31Monitor
  • ← EarlierCVE-2026-98024Sep 25, 2026 · s390/ism: folio_put() after error
    0Monitor
  • Later →CVE-2026-98026Sep 25, 2026 · net: bridge: mcast: properly convert mglist to rcu
    0Monitor

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 Linux00520cdd21ea6a9b5dc8d53bbd241620d2059554Vendor (CNA)
Linux Linux0dbc89e664b4609ad672b5bdeef60df251294b8fVendor (CNA)
Linux Linux237c9ae7145772af147e4665f158938350fa5658Vendor (CNA)
Linux Linux3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux59bf9e94bdc49557f07d87164269daff7340f4d6Vendor (CNA)
Linux Linux5d50e90add8b4a978395e893e81954d19d58a7c5Vendor (CNA)
Linux Linux659654654eb140851467af41d610473c100c7975Vendor (CNA)
Linux Linuxd0c1ce6ef4cefe568e19afa83f543caa3c3c0873Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · 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).

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.

No nightly-computed relations.

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

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✗ → ✓

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References

Show all references (7 more)

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

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