netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases - protected by region lock - in a set destroy phase - in a new/temporary set creation phase
CVE-2026-72436
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-2026-72436
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": "18f84d41d34fa35d0d64bbaea01fe664553ecc06",
"lessThan": "c107233d2ff4fd7cef5d02f9124b99194957a710",
"versionType": "git"
},
{
"status": "affected",
"version": "18f84d41d34fa35d0d64bbaea01fe664553ecc06",
"lessThan": "6329d3a9afe715fddda0460cfa46b496d61c2fe0",
"versionType": "git"
},
{
"status": "affected",
"version": "18f84d41d34fa35d0d64bbaea01fe664553ecc06",
"lessThan": "7445fe965b7d8756070a40e80f8b73348ccda1d7",
"versionType": "git"
},
{
"status": "affected",
"version": "18f84d41d34fa35d0d64bbaea01fe664553ecc06",
"lessThan": "c4d257734e91bfcdc71d41843392dd6400b5bb1b",
"versionType": "git"
},
{
"status": "affected",
"version": "18f84d41d34fa35d0d64bbaea01fe664553ecc06",
"lessThan": "3219d74e4536658c937fd878a327257b86ce80dd",
"versionType": "git"
},
{
"status": "affected",
"version": "18f84d41d34fa35d0d64bbaea01fe664553ecc06",
"lessThan": "e4b4984e28c16406ecb318444dea4a8bf47def3e",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/ipset/ip_set_hash_gen.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/ipset/ip_set_hash_gen.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72436
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33055 · Revision 1
- Added to Heist Feed
- Publisher date