Answer in brief
CVE-2026-64004 records a High severity (CVSS 7.8) vulnerability in net/iucv: fix locking in .getsockopt. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=51363b8751a673a00ad48eea895266396d53fa52 <884eb247b74d86db97e3a37f0d6fc8e1e83590dd || >=51363b8751a673a00ad48eea895266396d53fa52 <45bb8de8c95d8899f4b8f61bd9bceb8132af73cb || >=51363b8751a673a00ad48eea895266396d53fa52 <1fc30bd4e55e2dd622d2d366cecd732c1841bbee || >=51363b8751a673a00ad48eea895266396d53fa52 <cd691beafea0dd779e69e81ccc26b0ab50efcb5e || >=51363b8751a673a00ad48eea895266396d53fa52 <6e792b8dd3002bbc4136745928a9605df1a72b8a || >=51363b8751a673a00ad48eea895266396d53fa52 <9817369243380e287ebe5525411557eaa3aa2a79 || >=51363b8751a673a00ad48eea895266396d53fa52 <69554adc7a6fa04ede3ad7512321d83748e3c920 || >=51363b8751a673a00ad48eea895266396d53fa52 <3589d20a666caf30ad100c960a2de7de390fce88 | 884eb247b74d86db97e3a37f0d6fc8e1e83590dd, 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb, 1fc30bd4e55e2dd622d2d366cecd732c1841bbee, cd691beafea0dd779e69e81ccc26b0ab50efcb5e, 6e792b8dd3002bbc4136745928a9605df1a72b8a, 9817369243380e287ebe5525411557eaa3aa2a79, 69554adc7a6fa04ede3ad7512321d83748e3c920, 3589d20a666caf30ad100c960a2de7de390fce88 |
| Linux/Linuxgeneric | 3.4 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.