CVE-2026-64004net/iucv: fix locking in .getsockopt
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 51363b8751a673a00ad48eea895266396d53fa52 builds before 884eb247b74d86db97e3a37f0d6fc8e1e83590dd; 51363b8751a673a00ad48eea895266396d53fa52 builds before 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb; 51363b8751a673a00ad48eea895266396d53fa52 builds before 1fc30bd4e55e2dd622d2d366cecd732c1841bbee; from 51363b8751a673a00ad48eea895266396d53fa52 before cd691beafea0dd779e69e81ccc26b0ab50efcb5e; 51363b8751a673a00ad48eea895266396d53fa52 builds before 6e792b8dd3002bbc4136745928a9605df1a72b8a; from 51363b8751a673a00ad48eea895266396d53fa52 before 9817369243380e287ebe5525411557eaa3aa2a79; from 51363b8751a673a00ad48eea895266396d53fa52 before 69554adc7a6fa04ede3ad7512321d83748e3c920; 51363b8751a673a00ad48eea895266396d53fa52 builds before 3589d20a666caf30ad100c960a2de7de390fce88 | CNA record |
linux linux_kernel linux:linux_kernel | from 3.4 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590ddpatch
- https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cbpatch
- https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbeepatch
- https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5epatch
- https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8apatch
- https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79patch
- https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920patch
- https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.