{"id":"CVE-2026-74590","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nfsverity: Fix bpf_get_fsverity_digest() dynptr assumptions\n\nThe BPF verifier and the dynptr abstraction ensure that the memory space\nreferenced by a dynptr remains vali…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfsverity: Fix bpf_get_fsverity_digest() dynptr assumptions\n\nThe BPF verifier and the dynptr abstraction ensure that the memory space\nreferenced by a dynptr remains vali…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 67814c00de3161181cddd06c77aeaf86ac4cc584 < 1344b632cb5043e32939a84568125719111c5af3","Linux >= 67814c00de3161181cddd06c77aeaf86ac4cc584 < 2a5cfcad1d56e26d645b7887b0ed24c371851525","Linux >= 67814c00de3161181cddd06c77aeaf86ac4cc584 < 5bd63cad9df4328a184c409fbdad4f17944bcdb8","Linux >= 67814c00de3161181cddd06c77aeaf86ac4cc584 < 3e8ec7c0387273329374f5c7bd61f5f38af71fe1","Linux 6.8"],"published":"2026-08-22","updated":"2026-10-16","sourceUpdated":"2026-10-16T20:17:44.467","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74590","references":[{"url":"https://git.kernel.org/stable/c/1344b632cb5043e32939a84568125719111c5af3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2a5cfcad1d56e26d645b7887b0ed24c371851525","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3e8ec7c0387273329374f5c7bd61f5f38af71fe1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5bd63cad9df4328a184c409fbdad4f17944bcdb8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00129,"epssPercentile":0.02492,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:01:35.901397Z"},"ingestedAt":"2026-08-23T06:43:33.713Z","slug":"CVE-2026-74590","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfsverity: Fix bpf_get_fsverity_digest() dynptr assumptions\n\nThe BPF verifier and the dynptr abstraction ensure that the memory space\nreferenced by a dynptr remains valid.  They do not, however, provide any\nguarantee that the contents of the memory are stable.  kfuncs are\nexpected to remain memory-safe even if concurrent modifications occur.\n\nbpf_get_fsverity_digest() didn't follow that: it could crash if\narg->digest_size was concurrently modified.\n\nFix that by using the known-good value hash_alg->digest_size instead.\n\nAlso widen 'dynptr_sz' and 'out_digest_sz' to u64 to match the return\ntype of __bpf_dynptr_size().  It doesn't appear that it can actually be\nmore than INT_MAX currently (since __bpf_dynptr_data_rw() excludes\nfile-based pointers), but the correct type might as well be used.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":220152,"id":"CVE-2026-74590","ts":1791984788294,"field":"cvss","old":null,"new":"7.8"},{"seq":220151,"id":"CVE-2026-74590","ts":1791984788294,"field":"severity","old":"none","new":"high"}]}