Answer in brief
CVE-2026-53238 records a Medium severity (CVSS 5.5) vulnerability in netlabel: validate unlabeled address and mask attribute lengths. 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 5.5. 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 | >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <975a84fd741440853380d37465b6e226cf47254c || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <672f0f3b8f875ffe6525a37847eafa7648c4c0c6 || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <95bda3eac0b1454c2cee98d58d9ba6dd8391e843 || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6 || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <71c52da13c3737493b42d20d9f33de34e03b3156 || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8 || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <ccfe292a966079c61ea68a2da303b2a336170993 || >=8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd <9772589b57e44aedc240211c5c3f7a684a034d3a | 975a84fd741440853380d37465b6e226cf47254c, 672f0f3b8f875ffe6525a37847eafa7648c4c0c6, 95bda3eac0b1454c2cee98d58d9ba6dd8391e843, 07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6, 71c52da13c3737493b42d20d9f33de34e03b3156, 0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8, ccfe292a966079c61ea68a2da303b2a336170993, 9772589b57e44aedc240211c5c3f7a684a034d3a |
| Linux/Linuxgeneric | 2.6.25 | Not reported |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 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: netlabel: validate unlabeled address and mask attribute lengths netlbl_unlabel_addrinfo_get() used the address attribute length to determine whether the attribute data could be read as an IPv4 or IPv6 address, but did not independently validate the corresponding mask attribute length. A crafted Generic Netlink request could therefore provide a valid IPv4/IPv6 address attribute with a shorter mask attribute, which would later be read as a full struct in_addr or struct in6_addr. NLA_BINARY policy lengths are maximum lengths by default, so use NLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask attributes. This rejects short attributes during policy validation and also exposes the exact length requirements through policy introspection.
Quoted source text, attributed separately from HOL analysis.