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Vulnerability record · CVE-2026-64333 · published 25 July 2026

CVE-2026-64333: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: USB: serial: digi_acceleport: fix write buffer corruption The digi_write_inb_command() is supposed to wait for the write urb to become available or return an error, but instead it updates the transfer buffer and tries to resubmit the urb on timeout. To make things worse, for commands like break control where no timeout is used, the driver would corrupt the urb immediately due to a broken jiffies comparison (on 32-bit machines this takes five minutes of uptime to trigger due to INITIAL_JIFFIES). Fix this by adding the missing return on timeout and waiting indefinitely when no timeout has been specified as intended. This issue was (sort of) flagged by Sashiko when reviewing an unrelated change to the driver.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.5% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
3 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: digi_acceleport: fix write buffer corruption The digi_write_inb_command() is supposed to wait for the write urb to become available or return an error, but instead it updates the transfer buffer and tries to resubmit the urb on timeout. To make things worse, for commands like break control where no timeout is used, the driver would corrupt the urb immediately due to a broken jiffies comparison (on 32-bit machines this takes five minutes of uptime to trigger due to INITIAL_JIFFIES). Fix this by adding the missing return on timeout and waiting indefinitely when no timeout has been specified as intended. This issue was (sort of) flagged by Sashiko when reviewing an unrelated change to the driver.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1243f120790042c2ac92e84e797dacc75fff4366 Patch
https://git.kernel.org/stable/c/24ca1fea8f2753bf33e1d458ec1ae5d9b7796a65 Patch
https://git.kernel.org/stable/c/2f296974acc279f05f284441bfe3064074958d11 Patch
https://git.kernel.org/stable/c/5d9dc88bdf8897788b0eed57113e9eca7fd42ea9 Patch
https://git.kernel.org/stable/c/699dfb6917503b3cda4d5da6941cf79c3c1b4c8b Patch
https://git.kernel.org/stable/c/a274b3794fe1852c3d9fe6d900b94053c0b03410 Patch
https://git.kernel.org/stable/c/a3a13fdc53103b07335918e2cdeb465038a71725 Patch
https://git.kernel.org/stable/c/e60e4873e9178da9f4f2674e4c2ff085d5a84f79 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64333), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.