High 7.8Published Jun 25, 2026

CVE-2026-53212netfilter: nft_tunnel: fix use-after-free on object destroy

Updated under an hour ago (Oct 28, 2026, 8:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from af308b94a2a4a5a27bec9028354c4df444a7c8ba before 349df61526d2e39decc685d246202e3e284cfe05; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before 55b79b1ae42372012413ce0413181d26679b17ef; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before 5e9ee18b27fde88cb6148202b33916c66693fe82; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before 8767fe4079affa74314d7eb3220e700150289842; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before fda6573a46ad24f35348e024905ee5bdf729797e; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before f9a0e4b61054cde89a2a77845293c726cc07cc43; from af308b94a2a4a5a27bec9028354c4df444a7c8ba before c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.19 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05	patch
https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef	patch
https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82	patch
https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842	patch
https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e	patch
https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3	patch
https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43	patch
https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.