Answer in brief
CVE-2026-53212 records a High severity (CVSS 7.8) vulnerability in netfilter: nft_tunnel: fix use-after-free on object destroy. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-53212 records a High severity (CVSS 7.8) vulnerability in netfilter: nft_tunnel: fix use-after-free on object destroy. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <349df61526d2e39decc685d246202e3e284cfe05 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <55b79b1ae42372012413ce0413181d26679b17ef || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <5e9ee18b27fde88cb6148202b33916c66693fe82 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <8767fe4079affa74314d7eb3220e700150289842 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <fda6573a46ad24f35348e024905ee5bdf729797e || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <f9a0e4b61054cde89a2a77845293c726cc07cc43 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a | 349df61526d2e39decc685d246202e3e284cfe05, 55b79b1ae42372012413ce0413181d26679b17ef, 5e9ee18b27fde88cb6148202b33916c66693fe82, 8767fe4079affa74314d7eb3220e700150289842, fda6573a46ad24f35348e024905ee5bdf729797e, 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3, f9a0e4b61054cde89a2a77845293c726cc07cc43, c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a |
| Linux/Linuxgeneric | 4.19 | Not reported |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <349df61526d2e39decc685d246202e3e284cfe05 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <55b79b1ae42372012413ce0413181d26679b17ef || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <5e9ee18b27fde88cb6148202b33916c66693fe82 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <8767fe4079affa74314d7eb3220e700150289842 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <fda6573a46ad24f35348e024905ee5bdf729797e || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <f9a0e4b61054cde89a2a77845293c726cc07cc43 || >=af308b94a2a4a5a27bec9028354c4df444a7c8ba <c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a | 349df61526d2e39decc685d246202e3e284cfe05, 55b79b1ae42372012413ce0413181d26679b17ef, 5e9ee18b27fde88cb6148202b33916c66693fe82, 8767fe4079affa74314d7eb3220e700150289842, fda6573a46ad24f35348e024905ee5bdf729797e, 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3, f9a0e4b61054cde89a2a77845293c726cc07cc43, c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a |
| Linux/Linuxgeneric | 4.19 | Not reported |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.