netfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree() Since commit b36e4523d4d5 ("netfilter: nf_conncount: fix garbage collection confirm race"), `cpu` and `jiffies32` were introduced to the struct nf_conncount_tuple. The commit made nf_conncount_add() initialize `conn->cpu` and `conn->jiffies32` when allocating the struct. In contrast, count_tree() was not changed to initialize them. By commit 34848d5c896e ("netfilter: nf_conncount: Split insert and traversal"), count_tree() was split and the relevant allocation code now resides in insert_tree(). Initialize `conn->cpu` and `conn->jiffies32` in insert_tree(). BUG: KMSAN: uninit-value in find_or_evict net/netfilter/nf_conncount.c:117 [inline] BUG: KMSAN: uninit-value in __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143 find_or_evict net/netfilter/nf_conncount.c:117 [inline] __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143 count_tree net/netfilter/nf_conncount.c:438 [inline] nf_conncount_count+0x82f/0x1e80 net/netfilter/nf_conncount.c:521 connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72 __nft_match_eval net/netfilter/nft_compat.c:403 [inline] nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline] nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288 nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23 nf_hoo
CVE-2025-21959
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-2025-21959
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": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "f522229c5563b59b4240261e406779bba6754159",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "2a154ce766b995494e88d8d117fa82cc6b73dd87",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "e8544a5a97bee3674e7cd6bf0f3a4af517fa9146",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "a62a25c6ad58fae997f48a0749afeda1c252ae51",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "fda50302a13701d47fbe01e1739c7a51114144fb",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "db1e0c0856821c59a32ea3af79476bf20a6beeb2",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "2db5baaf047a7c8d6ed5e2cc657b7854e155b7fc",
"versionType": "git"
},
{
"status": "affected",
"version": "b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452",
"lessThan": "d653bfeb07ebb3499c403404c21ac58a16531607",
"versionType": "git"
},
{
"status": "affected",
"version": "75af3d78168e654a5cd8bbc4c774f97be836165f",
"versionType": "git"
},
{
"status": "affected",
"version": "4.14.92",
"lessThan": "4.15",
"versionType": "semver"
}
],
"programFiles": [
"net/netfilter/nf_conncount.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.292",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.236",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.180",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.132",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.84",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.20",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.8",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_conncount.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21959
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26973 · Revision 1
- Added to Heist Feed
- Publisher date