CVE-2026-63903: USB: serial: belkin_sa: validate interrupt status length

Awaiting analysis
AliasesUBUNTU-CVE-2026-63903DEBIAN-CVE-2026-63903
Published 19-07-2026Last modified 19-07-2026

Vulnerability summary

CVE-2026-63903 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 listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware 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: belkin_sa: validate interrupt status length The Belkin interrupt callback treats interrupt data as a four-byte status report and reads LSR/MSR fields at offsets 2 and 3. The interrupt-in buffer length is derived from endpoint wMaxPacketSize, and short interrupt transfers may complete successfully with a smaller actual_length. Check the completed interrupt packet length before parsing status fields so short interrupt endpoints and short successful packets are ignored instead of causing out-of-bounds or stale status-byte reads. KASAN report as below: BUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback() Read of size 1 Call trace: belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202) __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630) dummy_timer() (?:?)

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

Increase +0.01 pp

From 0.22% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

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≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f1617539ab90e67da788959bfd314076f093a11a | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f361359a952da15e70e693c2d7dca5c5843eae3e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 37e54d1b986df35c936d81e5b59a7aa3ec6938f0 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ffb739a49186ea784bbd9cb91b647f062395b419 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6a4602221cba7a738442328d66a2f0b1c9bf6e17 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 22823a319fb2afdf02cacafbed8b613b757efbc8 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < db1e7eb6203d534dad64cac2c793b69e561e657b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4ce058df2ee02cc2a0f0fd5cd64ce6f1482a0b65 | 2.6.12

3 vendors · 169 products

References

31 links
Show all 31 references