CVE-2026-63902: linux

CVSS: UnknownAwaiting analysis
AliasesUBUNTU-CVE-2026-63902DEBIAN-CVE-2026-63902
Published 19-07-2026Last modified 19-07-2026
Open JSON

Vulnerability summary

CVE-2026-63902 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.5% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 32 · Related 32
OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1SUSE-SU-2026:23221-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: validate interrupt packet headers cypress_read_int_callback() parses the interrupt-in buffer according to the selected Cypress packet format. Format 1 has a two-byte status/count header and format 2 has a one-byte combined status/count header. The usb-serial core sizes the interrupt-in buffer from the endpoint descriptor's wMaxPacketSize, and successful interrupt transfers can complete short when URB_SHORT_NOT_OK is not set. Check that the completed packet contains the selected header before reading it. Malformed short reports are ignored and the interrupt URB is resubmitted through the existing retry path, preventing out-of-bounds header-byte reads. KASAN report as below: KASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0 Read of size 1 Call trace: cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009) __usb_hcd_giveback_urb() dummy_timer() [ johan: use constants in header length sanity checks ]

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

+0.01 pp

From 0.22% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu167 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
Linux1 product
  • linux≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < fcef31a5a85ccf3c313449a866ec6ed7e4132425 | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < aaa66708bfb1dca2acd219d1c1582f9f6d5492cb | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < 44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < be50533fe7068e86eb7adb81988e6d6a3f6dfe53 | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < 90664556916de22467097d4c8ceb716d597a5c32 | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < ae03453f2c809ca3cf73753269fa6184dea7160f | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < 4a4cb0021ebe1fcadb52e04d19ed8d71470a530b | ≥ 3416eaa1f8f8d516b77de514e14cf8da256d28fb, < 9f9bfc80c67f35a275820da7e83a35dface08281 | 2.6.26

3 vendors · 169 products

References

31 links
Show all 31 references