Unknown

CVE-2026-63960 — usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()

In the Linux kernel, the following vulnerability has been resolved: usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer() wcove_read_rx_buffer() copies the PD RX FIFO into the caller's struct pd_message with for (i = 0; i < USBC_RXINFO_RXBYTES(info); i++) regmap_read(wcove->regmap, USBC_RX_DATA + i, msg + i); which has two problems: USBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message is 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed). The byte count latched in RXINFO is the number of bytes the port partner put on the wire, so a malicious partner that transmits a 31-byte frame can drive the loop one byte past the destination if the WCOVE BMC receiver does not enforce the PD object-count limit in hardware. The existing FIXME flagged this as unverified. Independently, regmap_read() takes an unsigned int * and stores a full unsigned int at the destination. Passing the byte pointer msg + i means each iteration writes four bytes; the high three are zero (val_bits is 8) and are normally overwritten by the next iteration, but the final iteration's high bytes are not. With RXBYTES == 30 the i == 29 iteration already writes three zero bytes past msg, which sits on the IRQ thread's stack in wcove_typec_irq(). Clamp the loop to sizeof(struct pd_message) and read each register into a local before storing only its low byte, so the copy can never exceed the destination regardless of what RXINFO reports.

Published Jul 19, 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

0.21%

ahead of 11% of scored CVEs · Oct 15, 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	≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < 3e632098d0521257ea965bbd6fde807d9bee5c8a≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < f2a1edc0bd142edabc6c85d88713f2bc178dd317≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < 6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < 5cd0e7ac4eefbdb330f8c72694fe74e63df65552≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < d0e4b8b3c6b7607a16932556eaaca5d5cf69f192≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < e94933dc41b87503bf585c8c6d53d740620eceb9≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < 3f9d50c8b02b4af0646aa892465080f9061fc89c≥ 3c4fb9f169214290ec9a943907321e6265b36f65 and < 4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa and 1 more version 4.15	Vulnerable	CVE Program (cve.org) e CISA ADP

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 · → Awaiting Analysis
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Jul 19, 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/d0e4b8b3c6b7607a16932556eaaca5d5cf69f192
NIST National Vulnerability Database
git.kernel.org/stable/c/f2a1edc0bd142edabc6c85d88713f2bc178dd317
NIST National Vulnerability Database
git.kernel.org/stable/c/5cd0e7ac4eefbdb330f8c72694fe74e63df65552
NIST National Vulnerability Database
git.kernel.org/stable/c/3e632098d0521257ea965bbd6fde807d9bee5c8a
NIST National Vulnerability Database
git.kernel.org/stable/c/e94933dc41b87503bf585c8c6d53d740620eceb9
NIST National Vulnerability Database
git.kernel.org/stable/c/4af7ad0e6d7aa4403dbb1dac7b9659b0421efcaa
NIST National Vulnerability Database
git.kernel.org/stable/c/6899f5b6d7b83ce79a3d331dc61dd31bf73f9c22
NIST National Vulnerability Database
git.kernel.org/stable/c/3f9d50c8b02b4af0646aa892465080f9061fc89c
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 22h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 22h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

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-2026-63960 is "usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer()", 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 0.21% 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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