{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64059", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.030Z", "datePublished": "2026-07-19T15:39:39.607Z", "dateUpdated": "2026-07-19T15:39:39.607Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:39:39.607Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix folio->private handling in netfs_perform_write()\n\nUnder some circumstances, netfs_perform_write() doesn't correctly\nmanipulate folio->private between NULL, NETFS_FOLIO_COPY_TO_CACHE, pointing\nto a group and pointing to a netfs_folio struct, leading to potential\nmultiple attachments of private data with associated folio ref leaks and\nalso leaks of netfs_folio structs or netfs_group refs.\n\nFix this by consolidating the place at which a folio is marked uptodate in\none place and having that look at what's attached to folio->private and\ndecide how to clean it up and then set the new group. Also, the content\nshouldn't be flushed if group is NULL, even if a group is specified in the\nnetfs_group parameter, as that would be the case for a new folio. A\nfilesystem should always specify netfs_group or never specify netfs_group.\n\nThe Sashiko auto-review tool noted that it was theoretically possible that\nthe fpos >= ctx->zero_point section might leak if it modified a streaming\nwrite folio. This is unlikely, but with a network filesystem, third party\nchanges can happen. It also pointed out that __netfs_set_group() would\nleak if called multiple times on the same folio from the \"whole folio\nmodify section\"."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/netfs/buffered_write.c", "include/trace/events/netfs.h"], "versions": [{"version": "8f52de0077ba3bf41e5d53d67a185700f41efce7", "lessThan": "7f040243c74d72b45b22246c7d9e621fbeab44ac", "status": "affected", "versionType": "git"}, {"version": "8f52de0077ba3bf41e5d53d67a185700f41efce7", "lessThan": "551b5c71ee312ca7646ddb605231c1016e8cbb18", "status": "affected", "versionType": "git"}, {"version": "8f52de0077ba3bf41e5d53d67a185700f41efce7", "lessThan": "0969ea8370bad0e4fb6131b6a7bed9e7ec522ac7", "status": "affected", "versionType": "git"}, {"version": "8f52de0077ba3bf41e5d53d67a185700f41efce7", "lessThan": "ccde2ac757c713535b224233a296de40efe5212d", "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_write.c", "include/trace/events/netfs.h"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "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": "6.12.92"}, {"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/7f040243c74d72b45b22246c7d9e621fbeab44ac"}, {"url": "https://git.kernel.org/stable/c/551b5c71ee312ca7646ddb605231c1016e8cbb18"}, {"url": "https://git.kernel.org/stable/c/0969ea8370bad0e4fb6131b6a7bed9e7ec522ac7"}, {"url": "https://git.kernel.org/stable/c/ccde2ac757c713535b224233a296de40efe5212d"}], "title": "netfs: Fix folio->private handling in netfs_perform_write()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: netfs: Fix folio->private handling in netfs_perform_write()", "id": "2502497", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502497"}, "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-911", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfs: Fix folio->private handling in netfs_perform_write()\nUnder some circumstances, netfs_perform_write() doesn't correctly\nmanipulate folio->private between NULL, NETFS_FOLIO_COPY_TO_CACHE, pointing\nto a group and pointing to a netfs_folio struct, leading to potential\nmultiple attachments of private data with associated folio ref leaks and\nalso leaks of netfs_folio structs or netfs_group refs.\nFix this by consolidating the place at which a folio is marked uptodate in\none place and having that look at what's attached to folio->private and\ndecide how to clean it up and then set the new group. Also, the content\nshouldn't be flushed if group is NULL, even if a group is specified in the\nnetfs_group parameter, as that would be the case for a new folio. A\nfilesystem should always specify netfs_group or never specify netfs_group.\nThe Sashiko auto-review tool noted that it was theoretically possible that\nthe fpos >= ctx->zero_point section might leak if it modified a streaming\nwrite folio. This is unlikely, but with a network filesystem, third party\nchanges can happen. It also pointed out that __netfs_set_group() would\nleak if called multiple times on the same folio from the \"whole folio\nmodify section\".", "A flaw was found in the Linux kernel's network filesystem (netfs) component. The `netfs_perform_write()` function, responsible for handling write operations, does not correctly manage private data associated with memory pages, known as folios. This improper handling can lead to memory leaks, where system resources are not properly released. Such leaks could potentially be exploited by an attacker to cause a denial of service by exhausting available memory or to gain unauthorized access to sensitive information."], "name": "CVE-2026-64059", "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": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64059\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64059\nhttps://lore.kernel.org/linux-cve-announce/2026071910-CVE-2026-64059-9d95@gregkh/T"], "threat_severity": "Moderate"}