High 7.8Published Aug 22, 2026

CVE-2026-74590fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions

Updated under an hour ago (2026-10-19 09:10 UTC)

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In the Linux kernel, the following vulnerability has been resolved: fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions The BPF verifier and the dynptr abstraction ensure that the memory space referenced by a dynptr remains valid. They do not, however, provide any guarantee that the contents of the memory are stable. kfuncs are expected to remain memory-safe even if concurrent modifications occur. bpf_get_fsverity_digest() didn't follow that: it could crash if arg->digest_size was concurrently modified. Fix that by using the known-good value hash_alg->digest_size instead. Also widen 'dynptr_sz' and 'out_digest_sz' to u64 to match the return type of __bpf_dynptr_size(). It doesn't appear that it can actually be more than INT_MAX currently (since __bpf_dynptr_data_rw() excludes file-based pointers), but the correct type might as well be used.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	67814c00de3161181cddd06c77aeaf86ac4cc584 builds before 1344b632cb5043e32939a84568125719111c5af3; 67814c00de3161181cddd06c77aeaf86ac4cc584 builds before 2a5cfcad1d56e26d645b7887b0ed24c371851525; 67814c00de3161181cddd06c77aeaf86ac4cc584 builds before 5bd63cad9df4328a184c409fbdad4f17944bcdb8; 67814c00de3161181cddd06c77aeaf86ac4cc584 builds before 3e8ec7c0387273329374f5c7bd61f5f38af71fe1	CNA record

References

https://git.kernel.org/stable/c/1344b632cb5043e32939a84568125719111c5af3
https://git.kernel.org/stable/c/2a5cfcad1d56e26d645b7887b0ed24c371851525
https://git.kernel.org/stable/c/5bd63cad9df4328a184c409fbdad4f17944bcdb8
https://git.kernel.org/stable/c/3e8ec7c0387273329374f5c7bd61f5f38af71fe1

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.