CVE-2026-53238
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…
Does this matter?
Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6Patch
- https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8Patch
- https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6Patch
- https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156Patch
- https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843Patch
- https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254cPatch
- https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3aPatch
- https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.