net/iucv: fix locking in .getsockopt
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.
CVE-2026-64004
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64004
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "884eb247b74d86db97e3a37f0d6fc8e1e83590dd",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "45bb8de8c95d8899f4b8f61bd9bceb8132af73cb",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "1fc30bd4e55e2dd622d2d366cecd732c1841bbee",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "cd691beafea0dd779e69e81ccc26b0ab50efcb5e",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "6e792b8dd3002bbc4136745928a9605df1a72b8a",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "9817369243380e287ebe5525411557eaa3aa2a79",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "69554adc7a6fa04ede3ad7512321d83748e3c920",
"versionType": "git"
},
{
"status": "affected",
"version": "51363b8751a673a00ad48eea895266396d53fa52",
"lessThan": "3589d20a666caf30ad100c960a2de7de390fce88",
"versionType": "git"
}
],
"programFiles": [
"net/iucv/af_iucv.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/iucv/af_iucv.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64004
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40929 · Revision 1
- Added to Heist Feed
- Publisher date