Answer in brief
CVE-2023-52628 records a High severity (CVSS 7.8) vulnerability in netfilter: nftables: exthdr: fix 4-byte stack OOB write. 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-2023-52628 records a High severity (CVSS 7.8) vulnerability in netfilter: nftables: exthdr: fix 4-byte stack OOB write. 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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=49499c3e6e18b7677a63316f3ff54a16533dc28f <28a97c43c9e32f437ebb8d6126f9bb7f3ca9521a || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <cf39c4f77a773a547ac2bcf30ecdd303bb0c80cb || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <a7d86a77c33ba1c357a7504341172cc1507f0698 || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <1ad7b189cc1411048434e8595ffcbe7873b71082 || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <d9ebfc0f21377690837ebbd119e679243e0099cc || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <c8f292322ff16b9a2272a67de396c09a50e09dce || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <fd94d9dadee58e09b49075240fe83423eb1dcd36 | 28a97c43c9e32f437ebb8d6126f9bb7f3ca9521a, cf39c4f77a773a547ac2bcf30ecdd303bb0c80cb, a7d86a77c33ba1c357a7504341172cc1507f0698, 1ad7b189cc1411048434e8595ffcbe7873b71082, d9ebfc0f21377690837ebbd119e679243e0099cc, c8f292322ff16b9a2272a67de396c09a50e09dce, fd94d9dadee58e09b49075240fe83423eb1dcd36 |
| Linux/Linuxgeneric | 4.1 | Not reported |
Published upstream
Mar 28, 2024
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: nftables: exthdr: fix 4-byte stack OOB write If priv->len is a multiple of 4, then dst[len / 4] can write past the destination array which leads to stack corruption. This construct is necessary to clean the remainder of the register in case ->len is NOT a multiple of the register size, so make it conditional just like nft_payload.c does. The bug was added in 4.1 cycle and then copied/inherited when tcp/sctp and ip option support was added. Bug reported by Zero Day Initiative project (ZDI-CAN-21950, ZDI-CAN-21951, ZDI-CAN-21961).
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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=49499c3e6e18b7677a63316f3ff54a16533dc28f <28a97c43c9e32f437ebb8d6126f9bb7f3ca9521a || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <cf39c4f77a773a547ac2bcf30ecdd303bb0c80cb || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <a7d86a77c33ba1c357a7504341172cc1507f0698 || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <1ad7b189cc1411048434e8595ffcbe7873b71082 || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <d9ebfc0f21377690837ebbd119e679243e0099cc || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <c8f292322ff16b9a2272a67de396c09a50e09dce || >=49499c3e6e18b7677a63316f3ff54a16533dc28f <fd94d9dadee58e09b49075240fe83423eb1dcd36 | 28a97c43c9e32f437ebb8d6126f9bb7f3ca9521a, cf39c4f77a773a547ac2bcf30ecdd303bb0c80cb, a7d86a77c33ba1c357a7504341172cc1507f0698, 1ad7b189cc1411048434e8595ffcbe7873b71082, d9ebfc0f21377690837ebbd119e679243e0099cc, c8f292322ff16b9a2272a67de396c09a50e09dce, fd94d9dadee58e09b49075240fe83423eb1dcd36 |
| Linux/Linuxgeneric | 4.1 | Not reported |
Published upstream
Mar 28, 2024
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: nftables: exthdr: fix 4-byte stack OOB write If priv->len is a multiple of 4, then dst[len / 4] can write past the destination array which leads to stack corruption. This construct is necessary to clean the remainder of the register in case ->len is NOT a multiple of the register size, so make it conditional just like nft_payload.c does. The bug was added in 4.1 cycle and then copied/inherited when tcp/sctp and ip option support was added. Bug reported by Zero Day Initiative project (ZDI-CAN-21950, ZDI-CAN-21951, ZDI-CAN-21961).
Quoted source text, attributed separately from HOL analysis.