CVE-2026-98149 (GCVE-0-2026-98149)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:36 – Updated: 2026-10-19 09:14
VLAI
Title
bpf: Fix percpu map update indexing with sparse CPU IDs
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix percpu map update indexing with sparse CPU IDs Per-CPU array, hash, and cgroup storage map updates without BPF_F_CPU or BPF_F_ALL_CPUS use a value buffer whose per-CPU slots are packed in possible-CPU order. The buffer is sized as: round_up(value_size, 8) * num_possible_cpus() The update paths iterate over possible CPUs, but use the logical CPU ID to calculate the source offset: value + size * cpu This only works when possible CPU IDs are contiguous starting at zero. For example, with a possible CPU mask of 0,2-3, the buffer contains three slots corresponding to CPUs 0, 2, and 3. CPU2 is therefore expected to use slot 1 and CPU3 slot 2. Instead, the current code uses slots 2 and 3 respectively, causing incorrect per-CPU values and an out-of-bounds read from the update buffer for CPU3. The corresponding lookup paths already use a dense offset while iterating over possible CPUs. Do the same for the array, hash, and cgroup storage update paths, advancing the source offset once for each possible CPU. BPF_F_ALL_CPUS continues to use the same value for every CPU.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6650 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8eb76cb03f0f6c2bd7b15cf45dcffcd6bd07a360 , < c16c62c91e5d6737a9fbb0a541b8b34610470a2b (git)
Affected: 8eb76cb03f0f6c2bd7b15cf45dcffcd6bd07a360 , < 75b0a6db4300e4c2c9e97a0848deaa7acfb42fb7 (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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}



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