netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate()
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate(): if (nft_set_elem_active(ext, iter->genmask)) return 0; /* skip active, process inactive */ With the buggy catchall version: nft_map_catchall_activate(): if (!nft_set_elem_active(ext, genmask)) continue; /* skip inactive, process active */ The consequence is that when a DELSET operation is aborted, nft_setelem_data_activate() is never called for the catchall element. For NFT_GOTO verdict elements, this means nft_data_hold() is never called to restore the chain->use reference count. Each abort cycle permanently decrements chain->use. Once chain->use reaches zero, DELCHAIN succeeds and frees the chain while catchall verdict elements still reference it, resulting in a use-after-free. This is ex
CVE-2026-23111
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-2026-23111
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": [
{
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"version": "25aa2ad37c2162be1c0bc4fe6397f7e4c13f00f8",
"lessThan": "8c760ba4e36c750379d13569f23f5a6e185333f5",
"versionType": "git"
},
{
"status": "affected",
"version": "d60be2da67d172aecf866302c91ea11533eca4d9",
"lessThan": "b9b6573421de51829f7ec1cce76d85f5f6fbbd7f",
"versionType": "git"
},
{
"status": "affected",
"version": "628bd3e49cba1c066228e23d71a852c23e26da73",
"lessThan": "42c574c1504aa089a0a142e4c13859327570473d",
"versionType": "git"
},
{
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"lessThan": "1444ff890b4653add12f734ffeffc173d42862dd",
"versionType": "git"
},
{
"status": "affected",
"version": "628bd3e49cba1c066228e23d71a852c23e26da73",
"lessThan": "8b68a45f9722f2babe9e7bad00aa74638addf081",
"versionType": "git"
},
{
"status": "affected",
"version": "628bd3e49cba1c066228e23d71a852c23e26da73",
"lessThan": "f41c5d151078c5348271ffaf8e7410d96f2d82f8",
"versionType": "git"
},
{
"status": "affected",
"version": "bc9f791d2593f17e39f87c6e2b3a36549a3705b1",
"versionType": "git"
},
{
"status": "affected",
"version": "3c7ec098e3b588434a8b07ea9b5b36f04cef1f50",
"versionType": "git"
},
{
"status": "affected",
"version": "a136b7942ad2a50de708f76ea299ccb45ac7a7f9",
"versionType": "git"
},
{
"status": "affected",
"version": "dc7cdf8cbcbf8b13de1df93f356ec04cdeef5c41",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.121",
"lessThan": "5.15.200",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.36",
"lessThan": "6.1.163",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.316",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.262",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.188",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.3.10",
"lessThan": "6.4",
"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": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.200",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.163",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.124",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.70",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.10",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23111
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #27202 · Revision 1
- Added to Heist Feed
- Publisher date