CVE-2026-98037
CVE CVE-2026-98037EUVD EUVD-2026-86690Published 2026-09-25T10:23:51.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject untrusted allocated-object pointers When the final RCU read-side critical section ends, a local kptr is demoted to PTR_UNTRUSTED but retains MEM_ALLOC. The pointer may be NULL or may refer to an object whose lifetime is no longer protected. type_is_ptr_alloc_obj() nevertheless recognizes any PTR_TO_BTF_ID with MEM_ALLOC as a live allocated object. In particular, a refcount-only local kptr never carries NON_OWN_REF, so it still passes the bpf_refcount_acquire() argument check after RCU protection ends. The kfunc can then dereference NULL or stale memory. Make type_is_ptr_alloc_obj() reject PTR_UNTRUSTED pointers. Since type_is_non_owning_ref() is based on the same predicate, graph kfunc arguments obey the same live-object requirement. Fault-protected reads of the demoted pointer remain valid: writes are already rejected, and read fixups use bpf_may_fault_on_deref() rather than this predicate. [ kkd: Rewrote commit log ]
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: 7.2.7; patch: 6.18.53; 1b12171533a9bb23cf6fba7262b479028b65e1e8 <135d542b97fa93e32c457d49d6e7b33ca7d05bae; patch: 7.3-rc2; 6.8; patch: 6.12.111; patch: 0; 1b12171533a9bb23cf6fba7262b479028b65e1e8 <092c2874dc1b2060fa77a465a971acd4fdf87683; 1b12171533a9bb23cf6fba7262b479028b65e1e8 <7441ee8276641bddaf1cba7bb75ef9c1458ceb3b; 1b12171533a9bb23cf6fba7262b479028b65e1e8 <6b1f786ad85a0b63393b76f5e634deab1a73198c
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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