{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64068","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.030Z","datePublished":"2026-07-19T15:39:45.306Z","dateUpdated":"2026-08-05T12:38:52.223Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:38:52.223Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing locking around retry adding new subreqs\n\nFix netfs_retry_read_subrequests() and netfs_retry_write_stream() to take\nthe appropriate lock when adding extra subrequests into\nstream->subrequests."}],"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 in netfs client retry logic reached when CIFS, Ceph, AFS, or fscache-backed NFS processes I/O responses from a remote server; a malicious or MITM server can trigger retries and race the collector via crafted protocol replies.\nAC:L - An attacker controlling the remote server can force NEED_RETRY conditions and time fast completions during subrequest splitting; they control both sides of the race by sending concurrent responses while the client retries.\nPR:N - Exploitation requires no privileges on the victim host; a remote attacker only needs the client to have an active mount and any process to perform normal reads or writes against it.\nUI:N - No victim interaction beyond routine filesystem access on an already-mounted share; readahead, writeback, and daemon I/O can trigger the race without deliberate user action.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the kernel; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Concurrent unsynchronized list manipulation of refcounted subrequest objects can cause use-after-free, enabling arbitrary kernel memory disclosure.\nI:H - List corruption and use-after-free on heap-allocated subrequests can be leveraged for arbitrary kernel writes and control-flow hijacking.\nA:H - The race can corrupt the subrequest list and trigger kernel oops, panic, or use-after-free crashes during normal network filesystem I/O retries."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/read_retry.c","fs/netfs/write_retry.c"],"versions":[{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","lessThan":"393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2","status":"affected","versionType":"git"},{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","lessThan":"cce18c263e9623872327ba3c956012f73c1179cc","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/read_retry.c","fs/netfs/write_retry.c"],"versions":[{"version":"6.10","status":"affected"},{"version":"0","lessThan":"6.10","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":"6.10","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/393f3f0d7353a94b1e0bc4ca89c683fe983e5fd2"},{"url":"https://git.kernel.org/stable/c/cce18c263e9623872327ba3c956012f73c1179cc"}],"title":"netfs: Fix missing locking around retry adding new subreqs","x_generator":{"engine":"bippy-1.2.0"}}}}