CVE-2026-64004

CVE CVE-2026-64004EUVD EUVD-2026-45577Published 2026-07-19T14:56:20.000ZLast changed 2026-08-05T12:38:04.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.6.143; patch: 0; 51363b8751a673a00ad48eea895266396d53fa52 <69554adc7a6fa04ede3ad7512321d83748e3c920; patch: 7.1; 51363b8751a673a00ad48eea895266396d53fa52 <9817369243380e287ebe5525411557eaa3aa2a79; 51363b8751a673a00ad48eea895266396d53fa52 <884eb247b74d86db97e3a37f0d6fc8e1e83590dd; patch: 5.10.259; 51363b8751a673a00ad48eea895266396d53fa52 <45bb8de8c95d8899f4b8f61bd9bceb8132af73cb; 51363b8751a673a00ad48eea895266396d53fa52 <1fc30bd4e55e2dd622d2d366cecd732c1841bbee; 51363b8751a673a00ad48eea895266396d53fa52 <6e792b8dd3002bbc4136745928a9605df1a72b8a; patch: 6.12.93; 51363b8751a673a00ad48eea895266396d53fa52 <cd691beafea0dd779e69e81ccc26b0ab50efcb5e; patch: 7.0.12; patch: 6.1.176; patch: 6.18.35; patch: 5.15.210; 51363b8751a673a00ad48eea895266396d53fa52 <3589d20a666caf30ad100c960a2de7de390fce88; 3.4

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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