CVE-2026-98039

The Linux kernel contains a vulnerability in the BPF subsystem where map_kptr_match_type() fails to properly validate the MEM_PERCPU flag for BPF_KPTR_PERCPU fields. Because the subset test accepts allocations without the required flag, a plain bpf_obj_new() allocation can be stored in a __percpu...

CVE-2026-98039 bpf: Require MEM_PERCPU for percpu kptr stores

In the Linux kernel, the following vulnerability has been resolved: bpf: Require MEMPERCPU for percpu kptr stores mapkptrmatchtype treats permflags as the set of register type flags that a kptr field permits. Adding MEMPERCPU to that set for BPFKPTRPERCPU does not require the source register to...

CVE-2026-98038 bpf: Keep refcount_acquire nullable for borrowed RCU kptrs

In the Linux kernel, the following vulnerability has been resolved: bpf: Keep refcountacquire nullable for borrowed RCU kptrs bpfrefcountacquire is fallible for a borrowed reference because the object may have reached a zero refcount. The verifier therefore keeps KFRETNULL on the return value...

CVE-2026-98037 bpf: Reject untrusted allocated-object pointers

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 PTRUNTRUSTED but retains MEMALLOC. The pointer may be NULL or may refer to an object whose lifetime is...

CVE-2026-98038

The Linux kernel contains a vulnerability in the BPF subsystem where bpf_refcount_acquire() incorrectly treats certain borrowed RCU kptrs as owning references. Specifically, refcounted objects without a graph node appear as owning references even without an acquired state. This allows a program t...

EUVD-2026-86690

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 PTRUNTRUSTED but retains MEMALLOC. The pointer may be NULL or may refer to an object whose lifetime is...

CVE-2026-98037

The Linux kernel contains a vulnerability where a local kptr demoted to PTR_UNTRUSTED after an RCU read-side critical section ends retains the MEM_ALLOC flag. Because type_is_ptr_alloc_obj() recognizes any PTR_TO_BTF_ID with MEM_ALLOC as a live object, a kfunc can erroneously pass a NULL or stale...

EUVD-2026-86691

In the Linux kernel, the following vulnerability has been resolved: bpf: Keep refcountacquire nullable for borrowed RCU kptrs bpfrefcountacquire is fallible for a borrowed reference because the object may have reached a zero refcount. The verifier therefore keeps KFRETNULL on the return value...

CVE-2026-98036

The Linux kernel contains a vulnerability in the BPF subsystem where rhtab_map_update_elem() incorrectly initializes special fields when obtaining an element from bpf_mem_cache_alloc() . Because the allocator can return a recycled unit from RCU-pending lists before its destructor runs, reinitiali...

CVE-2026-98036 bpf: Preserve special fields in recycled rhtab elements

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve special fields in recycled rhtab elements rhtabmapupdateelem initializes special fields after obtaining an element from bpfmemcachealloc. The allocator can return a fresh, zeroed unit, or recycle one from its...

EUVD-2026-86689

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve special fields in recycled rhtab elements rhtabmapupdateelem initializes special fields after obtaining an element from bpfmemcachealloc. The allocator can return a fresh, zeroed unit, or recycle one from its...

EUVD-2026-86688

In the Linux kernel, the following vulnerability has been resolved: bpf: Cancel special fields when recycling rhtab elements rhtabmapupdateexisting and rhtabdeleteelem call bpfobjfreefields when replacing or deleting a value. These map operations can run from BPF programs in NMI context, where...

CVE-2026-98035 bpf: Cancel special fields when recycling rhtab elements

In the Linux kernel, the following vulnerability has been resolved: bpf: Cancel special fields when recycling rhtab elements rhtabmapupdateexisting and rhtabdeleteelem call bpfobjfreefields when replacing or deleting a value. These map operations can run from BPF programs in NMI context, where...

CVE-2026-98035

The Linux kernel contains a vulnerability in the BPF subsystem where rhtab_map_update_existing() and rhtab_delete_elem() incorrectly call bpf_obj_free_fields() during map operations. This is problematic because these operations can execute in an NMI context , where releasing complex fields like k...

CVE-2026-98034 bpf: Mark NULL kptr stores precise

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark NULL kptr stores precise checkmapkptraccess permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it...

EUVD-2026-86687

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark NULL kptr stores precise checkmapkptraccess permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it...

CVE-2026-98034

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark NULL kptr stores precise checkmapkptraccess permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it...

CVE-2026-98034 bpf: Mark NULL kptr stores precise

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark NULL kptr stores precise checkmapkptraccess permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it...

CVE-2026-98034

The Linux kernel contains a vulnerability where the BPF verifier fails to mark a register as precise when it is known to contain zero during a scalar store into an untrusted kptr field. Because check_map_kptr_access() does not mark the register as precise, a state checkpoint with an imprecise zer...

EUVD-2026-86686

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve inner map identity in callback frames Callback frame constructors initialize map-typed argument registers with markregknownzero and then restore mapptr. This clears mapuid, which is the only field distinguishing inn...