CVE-2026-64336USB: serial: keyspan_pda: fix information leak
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < b069b7029862fafaff331d4c664d97d4ae828d6d
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < e52ca411f50539ff1d0c877b9312771ca8a858c1
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < 2f7a6b8ab3845bd1da02604f1a874b52a4555a72
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < e1494191a3aac665d3a2fce16169a97c346253ec
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < cf6ca0aefae03958cfb5b189b0adbfb25c06bfac
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < d4b12b6b395e43a2b1d80be3745631fcaa9c047b
- affected 034e38e8f68767fb5438ae3e608ee82919674177 – < 6bfc8d01ac4068eced509f8fc74d0cd205e4dcec
- affected 02407bc7d42347da7ed2a3926a0b824bfc614914
- affected 5.10.266 – < 5.11
- affected 5.11
- unaffected < 5.11
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d (opens in a new tab)
- https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1 (opens in a new tab)
- https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72 (opens in a new tab)
- https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec (opens in a new tab)
- https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac (opens in a new tab)
- https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b (opens in a new tab)
- https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48880 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64336)Record last updated .