netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref() Incoming skbs passing through netfilter flowtable offload hooks (or XFRM offload path) might already carry a ref-counted dst_entry assigned during earlier RX or routing steps. Calling skb_dst_set_noref() when skb already holds a ref-counted dst overwrites skb->_skb_refdst, leaking the previous dst_entry reference count and triggering a DEBUG_NET_WARN_ON_ONCE assertion in skb_dst_check_unset(): WARNING: at skb_dst_check_unset include/linux/skbuff.h:1170 WARNING: at skb_dst_set_noref include/linux/skbuff.h:1234 WARNING: at nf_flow_offload_ip_hook+0xf6c/0x2b60 net/netfilter/nf_flow_table_ip.c:864 Drop any existing dst_entry reference with skb_dst_drop(skb) before setting the non-referenced flowtable destination.
CVE-2026-74695
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-2026-74695
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": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
"lessThan": "4db3b48a966ed479b99cc8319ea9e46d4f7c703b",
"versionType": "git"
},
{
"status": "affected",
"version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
"lessThan": "274f544a32c08638ee887f2e27e3235b6b1237d4",
"versionType": "git"
},
{
"status": "affected",
"version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
"lessThan": "12afa450a6a6c0cce2c42b7545a9958f62d8a00c",
"versionType": "git"
},
{
"status": "affected",
"version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
"lessThan": "538e67e8c7889cf5f93951f5309d1bcb41f86036",
"versionType": "git"
},
{
"status": "affected",
"version": "2a79fd3908acd88e6cb0e620c314d7b1fee56a02",
"lessThan": "8aecf0bbcc72605592134c917c222207d8f63ab0",
"versionType": "git"
},
{
"status": "affected",
"version": "b4b1adf2e66ecc7125c4117e7aad9ff61e2cfd27",
"versionType": "git"
},
{
"status": "affected",
"version": "209dedf806d31095968f54323dbe62525b077b33",
"versionType": "git"
},
{
"status": "affected",
"version": "4.16.15",
"lessThan": "4.17",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.17.1",
"lessThan": "4.18",
"versionType": "semver"
}
],
"programFiles": [
"net/netfilter/nf_flow_table_ip.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": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_flow_table_ip.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74695
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46588 · Revision 1
- Added to Heist Feed
- Publisher date