PT-2026-61321 · Linux · Linux Kernel

CVE-2026-64004 · Published 2026-07-19 · Updated 2026-07-19

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition exists in the net/iucv component when recvmsg() is called simultaneously with getsockopt(SO MSGSIZE). An AF IUCV HIPER user can trigger a NULL pointer dereference because the SO MSGSIZE operation attempts to access iucv->hs dev->mtu after iucv sock close() has already set hs dev to NULL, leading to a kernel crash.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-64004

Affected Products

Linux Kernel

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-64004 · Security Note
• https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79 · Note
• https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920 · Note
• https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88 · Note
• https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a · Note
• https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee · Note
• https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd · Note
• https://twitter.com/CVEnew/status/2078861434696413224 · Twitter Post
• https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e · Note
• https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb · Note