CVE-2021-42739

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-20 · updated 2026-06-17
Weakness: CWE-787

Description

The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandles bounds checking.

Affected products

Debian Linux: 9.0
Fedoraproject Fedora: 33, 34, 35
Linux kernel: through 5.14.13
Oracle Communications Cloud Native Core Binding Support Function: 22.1.3
Oracle Communications Cloud Native Core Network Exposure Function: 22.1.1
Oracle Communications Cloud Native Core Policy: 22.2.0
Starwindsoftware Starwind San & Nas: v8r12
Starwindsoftware Starwind Virtual San: v8r13-14338

References

https://bugzilla.redhat.com/show_bug.cgi?id=1951739
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35d2969ea3c7d32aee78066b1f3cf61a0d935a4e
https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ%40mwanda/
https://seclists.org/oss-sec/2021/q2/46
https://www.oracle.com/security-alerts/cpujul2022.html
https://www.starwindsoftware.com/security/sw-20220804-0001/
https://bugzilla.redhat.com/show_bug.cgi?id=1951739
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35d2969ea3c7d32aee78066b1f3cf61a0d935a4e
https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ%40mwanda/
https://seclists.org/oss-sec/2021/q2/46
https://www.oracle.com/security-alerts/cpujul2022.html
https://www.starwindsoftware.com/security/sw-20220804-0001/

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