{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64066","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.030Z","datePublished":"2026-07-19T15:39:44.032Z","dateUpdated":"2026-08-05T12:38:50.075Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:38:50.075Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix netfs_read_to_pagecache() to pause on subreq failure\n\nFix netfs_read_to_pagecache() so that it pauses the generation of new\nsubrequests if an already-issued subrequest fails."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The bug is hit when processing failed network filesystem read completions from remote SMB/NFS/Ceph/9p servers; a malicious or compromised server can trigger mid-read I/O errors over the network during buffered readahead without local kernel access.\nAC:L - An attacker controlling the remote server can reliably cause read failures during large multi-subrequest readahead, and controls the timing of async completions that race the issuer thread; no uncontrollable conditions are required.\nPR:N - The attacker operates as a remote malicious network filesystem server and needs no local privileges on the victim; any user with read access to an already-mounted share can trigger the vulnerable path via normal file reads.\nUI:N - Exploitation requires only routine file access on pre-mounted enterprise NAS/CIFS home directories or auto-mounted virtio-fs/9p shares, with no additional victim action beyond normal reads.\nS:U - Impact is kernel memory corruption and potential local privilege escalation within the same kernel security boundary, not a VM escape or cross-authority boundary bypass.\nC:H - Concurrent issuer/collector manipulation of rolling_buffer folio_queues after subrequest failure can cause use-after-free and out-of-bounds access on kernel heap objects, enabling arbitrary memory disclosure.\nI:H - The race allows continued I/O and buffer advancement after failure handling has abandoned regions, corrupting pagecache folio state and heap metadata in ways that can be leveraged for arbitrary kernel writes or code execution.\nA:H - The synchronization bug causes kernel memory corruption that can trigger oops, BUG, or panic; even without full exploitation, repeated triggering causes system crashes."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/buffered_read.c"],"versions":[{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","lessThan":"884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8","status":"affected","versionType":"git"},{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","lessThan":"0256e79ce42101ad036edd4205bccca621ea0927","status":"affected","versionType":"git"},{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","lessThan":"8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/buffered_read.c"],"versions":[{"version":"6.12","status":"affected"},{"version":"0","lessThan":"6.12","status":"unaffected","versionType":"semver"},{"version":"6.18.34","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.11","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8"},{"url":"https://git.kernel.org/stable/c/0256e79ce42101ad036edd4205bccca621ea0927"},{"url":"https://git.kernel.org/stable/c/8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4"}],"title":"netfs: Fix netfs_read_to_pagecache() to pause on subreq failure","x_generator":{"engine":"bippy-1.2.0"}}}}