netfilter: nft_tunnel: fix use-after-free on object destroy
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory. Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.
CVE-2026-53212
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-2026-53212
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": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "349df61526d2e39decc685d246202e3e284cfe05",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "55b79b1ae42372012413ce0413181d26679b17ef",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "5e9ee18b27fde88cb6148202b33916c66693fe82",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "8767fe4079affa74314d7eb3220e700150289842",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "fda6573a46ad24f35348e024905ee5bdf729797e",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "f9a0e4b61054cde89a2a77845293c726cc07cc43",
"versionType": "git"
},
{
"status": "affected",
"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba",
"lessThan": "c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nft_tunnel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nft_tunnel.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53212
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40781 · Revision 1
- Added to Heist Feed
- Publisher date