CVE-2026-64027

CVE CVE-2026-64027EUVD EUVD-2026-45600Published 2026-07-19T15:39:18.000ZLast changed 2026-08-05T12:38:22.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: net: shaper: rework the VALID marking (again) Recent commit changed the semantics from NOT_VALID to VALID. I didn't realize that the flags are not stored atomically with the entry in XArray. There's still a race of reader observing a VALID mark for a slot, getting interrupted, writer replacing the entry with a different one, reader continuing, fetching the entry which is now a different pointer than the pointer for which VALID was meant. The biggest consequence of this is that we may see a UAF since net_shaper_rollback() assumed that entries without VALID can be freed without observing RCU. Looks like the XArray marks are buying us nothing at this point. Let's convert the code to an explicit valid field. The smp_load_acquire() / smp_store_release() barriers are marginally cleaner.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; 93954b40f6a4fc43226c01a15b02732f884500f1 <96ea960dd40fd55302e0fd755176f26a95e6a50c; patch: 7.0.11; patch: 6.18.34; 6.13; 93954b40f6a4fc43226c01a15b02732f884500f1 <2417df5e7bb4184b9d3a2988036bf2c46e594545; 93954b40f6a4fc43226c01a15b02732f884500f1 <b8d7519352ba8c6df83259295d4a3bad093cae90; patch: 7.1

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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