5.5

CVE-2026-64336: USB: serial: keyspan_pda: fix information leak

Modified
AliasesUBUNTU-CVE-2026-64336DEBIAN-CVE-2026-64336
Published 25-07-2026Last modified 14-09-2026

Vulnerability summary

CVE-2026-64336 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.12%
0%100%
Low · 0.00 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-2026:11476-1OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: keyspan_pda: fix information leak The write() callback is supposed to return the number of characters accepted or a negative errno. Since the addition of write fifo support the keyspan_pda implementation will however return the number characters submitted to the device if the write urb is not already in use. If this number is larger than the number of characters passed to write(), the line discipline continues writing data from beyond the tty write buffer. Fix the information leak by making sure that keyspan_pda_write_start() returns zero on success as intended.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.12% on 04-10-2026

04-10-202603-11-2026

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

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux2 products
  • linux≥ 034e38e8f68767fb5438ae3e608ee82919674177, < b069b7029862fafaff331d4c664d97d4ae828d6d | ≥ 034e38e8f68767fb5438ae3e608ee82919674177, < e52ca411f50539ff1d0c877b9312771ca8a858c1 | ≥ 034e38e8f68767fb5438ae3e608ee82919674177, < 2f7a6b8ab3845bd1da02604f1a874b52a4555a72 | ≥ 034e38e8f68767fb5438ae3e608ee82919674177, < e1494191a3aac665d3a2fce16169a97c346253ec | ≥ 034e38e8f68767fb5438ae3e608ee82919674177, < cf6ca0aefae03958cfb5b189b0adbfb25c06bfac | ≥ 034e38e8f68767fb5438ae3e608ee82919674177, < d4b12b6b395e43a2b1d80be3745631fcaa9c047b | ≥ 034e38e8f68767fb5438ae3e608ee82919674177, < 6bfc8d01ac4068eced509f8fc74d0cd205e4dcec | 02407bc7d42347da7ed2a3926a0b824bfc614914 | ≥ 5.10.266, < 5.11 | 5.11
  • linux_kernel≥ 5.11, < 5.15.212 | ≥ 5.16, < 6.1.178 | ≥ 6.2, < 6.6.145 | ≥ 6.7, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4 | 7.2:rc1 | 7.2:rc2

3 vendors · 161 products

References

30 links
Show all 30 references