Answer in brief
CVE-2026-64004 records a Unknown severity 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.
Answer in brief
CVE-2026-64004 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.