{"id":"CVE-2026-64066","state":"PUBLISHED","title":"netfs: Fix netfs_read_to_pagecache() to pause on subreq failure","description":"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.","publishedAt":"2026-07-19T15:39:44.032Z","updatedAt":"2026-08-05T12:38:50.075Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","status":"affected","lessThan":"884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8","versionType":"git"},{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","status":"affected","lessThan":"0256e79ce42101ad036edd4205bccca621ea0927","versionType":"git"},{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","status":"affected","lessThan":"8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/buffered_read.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/buffered_read.c"]}],"references":["https://git.kernel.org/stable/c/884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8","https://git.kernel.org/stable/c/0256e79ce42101ad036edd4205bccca621ea0927","https://git.kernel.org/stable/c/8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64066.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64066","state":"PUBLISHED","datePublished":"2026-07-19T15:39:44.032Z","dateUpdated":"2026-08-05T12:38:50.075Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.030Z"},"containers":{"cna":{"title":"netfs: Fix netfs_read_to_pagecache() to pause on subreq failure","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","status":"affected","lessThan":"884c4c4f35e577aba6a0593c80cbea9ca5e6e2b8","versionType":"git"},{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","status":"affected","lessThan":"0256e79ce42101ad036edd4205bccca621ea0927","versionType":"git"},{"version":"ee4cdf7ba857a894ad1650d6ab77669cbbfa329e","status":"affected","lessThan":"8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/buffered_read.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/buffered_read.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:38:50.075Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}