# CVE-2026-98150: linux: In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix BPF_F_CPU validation for sparse CPU IDs...

CVE-2026-98150 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98150 (version 7.2.7-1), released October 2, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-98150
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0010
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 25, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix BPF_F_CPU validation for sparse CPU IDs  BPF_F_CPU stores the target CPU ID in the upper 32 bits of the map operation flags. bpf_map_check_op_flags() currently compares that ID with num_possible_cpus(), which is the number of possible CPUs rather than a bound on CPU IDs.  On an arm64 QEMU guest with a CPU device-tree hole, the possible CPU mask was 0,2-3. A userspace program using raw bpf() syscalls creates a BPF_MAP_TYPE_PERCPU_ARRAY and performs update and lookup operations for each CPU by setting BPF_F_CPU and the CPU ID in the flags.  With the old check, CPU 1 is incorrectly accepted while valid CPU 3 is rejected with -ERANGE. The CPU 1 update then reaches the per-CPU map access path and triggers:    Unable to handle kernel paging request at virtual address ...   pc : __pi_memcpy_generic+0x5c/0x22c   lr : bpf_percpu_array_update+0x2dc/0x2e8   Call trace:     __pi_memcpy_generic     bpf_map_update_value     map_update_elem     __sys_bpf  Check the CPU ID against nr_cpu_ids and cpu_possible() instead. This rejects CPU IDs outside the valid range and CPUs absent from the possible mask, while allowing valid sparse CPU IDs.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.7-1 | [DEBIAN-CVE-2026-98150](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98150.md) | Oct 2, 2026 |

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