Unknown

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

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.

Published Sep 25, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.23%

ahead of 13% of scored CVEs · Oct 16, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < d0c1ce6ef4cefe568e19afa83f543caa3c3c0873≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 0dbc89e664b4609ad672b5bdeef60df251294b8f≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 00520cdd21ea6a9b5dc8d53bbd241620d2059554≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 59bf9e94bdc49557f07d87164269daff7340f4d6≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 659654654eb140851467af41d610473c100c7975≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 237c9ae7145772af147e4665f158938350fa5658≥ ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 and < 5d50e90add8b4a978395e893e81954d19d58a7c5 and 5 more version 5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdbversion c1b187a86a176e42f5e48066556980e3232b6cab≥ 4.19.322 and < 4.20≥ 5.4.284 and < 5.5version 5.10	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 16, 2026 · 2 reading(s) · max 0.23%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 25, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/0dbc89e664b4609ad672b5bdeef60df251294b8f
NIST National Vulnerability Database
git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658
NIST National Vulnerability Database
git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287
NIST National Vulnerability Database
git.kernel.org/stable/c/59bf9e94bdc49557f07d87164269daff7340f4d6
NIST National Vulnerability Database
git.kernel.org/stable/c/00520cdd21ea6a9b5dc8d53bbd241620d2059554
NIST National Vulnerability Database
git.kernel.org/stable/c/d0c1ce6ef4cefe568e19afa83f543caa3c3c0873
NIST National Vulnerability Database
git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975
NIST National Vulnerability Database
git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 2d
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 2d
Unknown CVE-2026-98430 RDMA/efa: Keep admin queues alive while IRQ is registered 3d
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 3d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 3d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98025 is "net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.23% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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