Answer in brief
CVE-2023-53619 records a High severity (CVSS 7.8) vulnerability in netfilter: conntrack: Avoid nf_ct_helper_hash uses after free. 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-2023-53619 records a High severity (CVSS 7.8) vulnerability in netfilter: conntrack: Avoid nf_ct_helper_hash uses after free. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=12f7a505331e6b2754684b509f2ac8f0011ce644 <4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <00716f25f9697d02a0d9bd622575c7c7321ba3d0 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <61c7a5256543ae7d24cd9d21853d514c8632e1e9 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <8289d422f5e484efe4a565fe18e862ecd621c175 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <05561f822f27b9fa88fa5504ddec34bf38833034 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <6eef7a2b933885a17679eb8ed0796ddf0ee5309b | 4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7, 00716f25f9697d02a0d9bd622575c7c7321ba3d0, 61c7a5256543ae7d24cd9d21853d514c8632e1e9, 8289d422f5e484efe4a565fe18e862ecd621c175, 6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566, 05561f822f27b9fa88fa5504ddec34bf38833034, fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7, 6eef7a2b933885a17679eb8ed0796ddf0ee5309b |
| Linux/Linuxgeneric | 3.6 | Not reported |
Published upstream
Oct 7, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map. When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption. This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.
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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=12f7a505331e6b2754684b509f2ac8f0011ce644 <4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <00716f25f9697d02a0d9bd622575c7c7321ba3d0 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <61c7a5256543ae7d24cd9d21853d514c8632e1e9 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <8289d422f5e484efe4a565fe18e862ecd621c175 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <05561f822f27b9fa88fa5504ddec34bf38833034 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7 || >=12f7a505331e6b2754684b509f2ac8f0011ce644 <6eef7a2b933885a17679eb8ed0796ddf0ee5309b | 4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7, 00716f25f9697d02a0d9bd622575c7c7321ba3d0, 61c7a5256543ae7d24cd9d21853d514c8632e1e9, 8289d422f5e484efe4a565fe18e862ecd621c175, 6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566, 05561f822f27b9fa88fa5504ddec34bf38833034, fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7, 6eef7a2b933885a17679eb8ed0796ddf0ee5309b |
| Linux/Linuxgeneric | 3.6 | Not reported |
Published upstream
Oct 7, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map. When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption. This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.
Quoted source text, attributed separately from HOL analysis.