netfilter: nf_tables: unconditionally bump set->nelems before insertion
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already. To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state. As for element updates, decrement set->nelems to restore it. A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches.
CVE-2026-23272
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-2026-23272
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": "35d0ac9070ef619e3bf44324375878a1c540387b",
"lessThan": "25fcaef7948912652905e96922f36583a84fffed",
"versionType": "git"
},
{
"status": "affected",
"version": "35d0ac9070ef619e3bf44324375878a1c540387b",
"lessThan": "e3ccb11fc8249759d23326038c8db987ddaabc77",
"versionType": "git"
},
{
"status": "affected",
"version": "35d0ac9070ef619e3bf44324375878a1c540387b",
"lessThan": "86bc4b1a0f672d47ac19f9022432cb6a2e01cb33",
"versionType": "git"
},
{
"status": "affected",
"version": "35d0ac9070ef619e3bf44324375878a1c540387b",
"lessThan": "6826131c7674329335ca25df2550163eb8a1fd0c",
"versionType": "git"
},
{
"status": "affected",
"version": "35d0ac9070ef619e3bf44324375878a1c540387b",
"lessThan": "ccb8c8f3c1127cf34d18c737309897c68046bf21",
"versionType": "git"
},
{
"status": "affected",
"version": "35d0ac9070ef619e3bf44324375878a1c540387b",
"lessThan": "def602e498a4f951da95c95b1b8ce8ae68aa733a",
"versionType": "git"
},
{
"status": "affected",
"version": "fefdd79403e89b0c673965343b92e2e01e2713a8",
"versionType": "git"
},
{
"status": "affected",
"version": "4.9.33",
"lessThan": "4.10",
"versionType": "semver"
}
],
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23272
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39832 · Revision 1
- Added to Heist Feed
- Publisher date