CVE-2026-64067

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Relatedly, the functions that build the\nlist don't use any sort of write barrier when constructing the list to make\nsure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if\nno lock is taken.\n\nFix this by:\n\n (1) Add a new list_add_tail_release() function that uses a release barrier\n to set the pointer to the new member of the list.\n\n (2) Add a new list_first_entry_or_null_acquire() function that uses an\n acquire barrier to read the pointer to the first member in a list (or\n return NULL).\n\n (3) Use list_add_tail_release() when adding a subreq to ->subrequests.\n\n (4) Use list_first_entry_or_null_acquire() when initially accessing the\n front of the list (when an item is removed, the pointer to the new\n front iterm is obtained under the same lock)."}], "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 the netfs client library used by CIFS/SMB, Ceph, 9p, AFS, and NFS clients; a remote file server controls when read/write completions arrive over the network and can time responses to hit the lockless subrequest list race during collection.\nAC:L - The attacker controls both sides of the concurrency (issuing concurrent reads/writes and timing remote completions); on weakly-ordered architectures the missing barriers can cause deterministic misordering without relying on rare external conditions.\nPR:N - A malicious or compromised remote SMB/Ceph/NFS server needs no local privileges on the victim; exploitation only requires the victim system to perform I/O against an already-mounted network filesystem share.\nUI:N - On servers and enterprise systems with persistent fstab/autofs mounts, automated processes (writeback, readahead, backup daemons) trigger netfs I/O without live end-user action at exploit time.\nS:U - Impact is kernel memory corruption and privilege escalation within the same kernel security boundary; this is not a VM escape or cross-authority boundary bypass.\nC:H - Premature removal and freeing of in-flight subrequests is a use-after-free; the collector may read freed `netfs_io_subrequest` memory and stale counters, enabling arbitrary kernel memory disclosure.\nI:H - The UAF and concurrent access to subrequest fields while I/O handlers still run can corrupt heap metadata and subrequest state, providing a path to arbitrary kernel writes or code execution.\nA:H - Freeing active subrequests while SMB/Ceph completion handlers still reference them can cause kernel oops, BUG, or panic from use-after-free and list corruption."}]}], "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", "fs/netfs/misc.c", "fs/netfs/read_collect.c", "fs/netfs/write_collect.c", "fs/netfs/write_issue.c", "include/linux/list.h"], "versions": [{"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "f048f297d93fdb19d72d01d22f04c419d8b16602", "status": "affected", "versionType": "git"}, {"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "293a4532c36f38458e38b8879b174ab797718b9d", "status": "affected", "versionType": "git"}, {"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "b5782e2d462c028096f922abca46318cec890670", "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", "fs/netfs/misc.c", "fs/netfs/read_collect.c", "fs/netfs/write_collect.c", "fs/netfs/write_issue.c", "include/linux/list.h"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "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": "6.10", "versionEndExcluding": "6.18.57"}, {"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/f048f297d93fdb19d72d01d22f04c419d8b16602"}, {"url": "https://git.kernel.org/stable/c/293a4532c36f38458e38b8879b174ab797718b9d"}, {"url": "https://git.kernel.org/stable/c/b5782e2d462c028096f922abca46318cec890670"}], "title": "netfs: Fix missing barriers when accessing stream->subrequests locklessly", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/netfs/buffered_read.c", "fs/netfs/misc.c", "fs/netfs/read_collect.c", "fs/netfs/write_collect.c", "fs/netfs/write_issue.c", "include/linux/list.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f048f297d93fdb19d72d01d22f04c419d8b16602", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}, {"lessThan": "293a4532c36f38458e38b8879b174ab797718b9d", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}, {"lessThan": "b5782e2d462c028096f922abca46318cec890670", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/netfs/buffered_read.c", "fs/netfs/misc.c", "fs/netfs/read_collect.c", "fs/netfs/write_collect.c", "fs/netfs/write_issue.c", "include/linux/list.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3D58F7F7-D3D4-4428-9A39-E525E5BBCEA0", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing barriers when accessing stream->subrequests locklessly\n\nThe list of subrequests attached to stream->subrequests is accessed without\nlocks by netfs_collect_read_results() and netfs_collect_write_results(),\nand then they access subreq->flags without taking a barrier after getting\nthe subreq pointer from the list. Relatedly, the functions that build the\nlist don't use any sort of write barrier when constructing the list to make\nsure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if\nno lock is taken.\n\nFix this by:\n\n (1) Add a new list_add_tail_release() function that uses a release barrier\n to set the pointer to the new member of the list.\n\n (2) Add a new list_first_entry_or_null_acquire() function that uses an\n acquire barrier to read the pointer to the first member in a list (or\n return NULL).\n\n (3) Use list_add_tail_release() when adding a subreq to ->subrequests.\n\n (4) Use list_first_entry_or_null_acquire() when initially accessing the\n front of the list (when an item is removed, the pointer to the new\n front iterm is obtained under the same lock)."}], "id": "CVE-2026-64067", "lastModified": "2026-10-15T11:17:38.860", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:47.290", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/293a4532c36f38458e38b8879b174ab797718b9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5782e2d462c028096f922abca46318cec890670"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f048f297d93fdb19d72d01d22f04c419d8b16602"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfs: Fix missing barriers when accessing stream->subrequests locklessly", "id": "2502587", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502587"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's netfs component. This vulnerability stems from missing memory barriers when the `stream->subrequests` list is accessed without locks. Specifically, functions that process read and write results, such as `netfs_collect_read_results()` and `netfs_collect_write_results()`, access subrequest flags without proper synchronization. This can lead to race conditions, potentially causing data inconsistency or system instability due to an incorrect perception of subrequest states."], "name": "CVE-2026-64067", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64067\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64067\nhttps://lore.kernel.org/linux-cve-announce/2026071912-CVE-2026-64067-9bf7@gregkh/T"], "threat_severity": "Moderate"}

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