{"id":"CVE-2026-74354","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Take mmap_lock in zap_pages()\n\nzap_vma_range() requires the owning mm's mmap_lock to be held.\n\nTaking mmap_read_lock under arena->lock would AB-BA against\narena_vm…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Take mmap_lock in zap_pages()\n\nzap_vma_range() requires the owning mm's mmap_lock to be held.\n\nTaking mmap_read_lock under arena->lock would AB-BA against\narena_vm…","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","cwe":["CWE-833"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9"],"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:17:41.137","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74354","references":[{"url":"https://git.kernel.org/stable/c/36b1d997866f6083d33934983aa2ce0a184ed642","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/80b89d0226a05e8b67969de99c31b51fcd54f76a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74354.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-74354"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2516793"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74354"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74354"},{"url":"https://lore.kernel.org/linux-cve-announce/2026081500-CVE-2026-74354-67c4@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00165,"epssPercentile":0.05677,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:54:18.946852Z"},"scores":{"nvd":7.8,"vendor":5.5,"cna":7.8},"ingestedAt":"2026-10-16T19:46:24.375Z","slug":"CVE-2026-74354","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Take mmap_lock in zap_pages()\n\nzap_vma_range() requires the owning mm's mmap_lock to be held.\n\nTaking mmap_read_lock under arena->lock would AB-BA against\narena_vm_close() and arena_map_mmap(), both of which run with\nmmap_write_lock held and then acquire arena->lock. Instead drop\narena->lock, mmget_not_zero() the vma's mm, take mmap_read_lock, and\nre-resolve the vma via find_vma() since it may have been unmapped or\nreplaced while waiting.\n\nTrack processed vmls with a per-call generation in vml->zap_gen and\nserialize zap_pages() callers with a new arena->zap_mutex so\nconcurrent callers on different uaddr ranges do not mark each other's\nvmls processed before the zap is done.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74354.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":230335,"id":"CVE-2026-74354","ts":1793130918926,"field":"cvss","old":"5.5","new":"7.8"},{"seq":230334,"id":"CVE-2026-74354","ts":1793130918926,"field":"severity","old":"medium","new":"high"},{"seq":223601,"id":"CVE-2026-74354","ts":1792238335250,"field":"cvss","old":"7.8","new":"5.5"},{"seq":223600,"id":"CVE-2026-74354","ts":1792238335250,"field":"severity","old":"high","new":"medium"}]}