CVE-2026-97584

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97584", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.156Z", "datePublished": "2026-09-25T10:22:04.322Z", "dateUpdated": "2026-10-19T09:09:47.944Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:09:47.944Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix incorrect free in candidate cleanup in afs_lookup_server()\n\nFix afs_lookup_server() to not free an existing server's endpoint state\nwhen cleaning up a candidate server. The candidate record doesn't have an\nendpoint state yet at this point, so the free for that can just be removed."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - afs_lookup_server() is reached through afs_create_volume()/afs_update_volume_state() -> afs_alloc_server_list() when a local process walks a kAFS path (for example /afs/<cell>/<vol> automount) or uses a volume. Nothing malformed comes off the wire. The defect is local cleanup logic that frees the wrong object, so the attacker needs a local account on the AFS client.\nAC:L - The candidate is left non-NULL when afs_install_server() returns an existing record. That happens when the attacker runs parallel lookups of volumes on the same fileserver UUID, or accesses the path again after a creation attempt failed and left the record marked UNCREATED. Both states come from the attacker's own path accesses; neither depends on outside conditions.\nPR:L - Mounting kAFS needs CAP_SYS_ADMIN (no FS_USERNS_MOUNT). On a client that already has the /afs dynroot mounted, any unprivileged user can start the volume and server lookups that reach afs_lookup_server() just by accessing /afs/<cell>/... paths.\nUI:N - No victim action is needed; the attacker triggers the lookups and the faulty cleanup with their own filesystem accesses.\nS:U - The memory corruption stays inside the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The cleanup at the out: label kfree()s the existing server's live, refcounted afs_endpoint_state. server->endpoint_state and in-flight probe/rotate operations still reference it, giving a use-after-free of a sprayable kmalloc object that can be reclaimed to leak kernel data.\nI:H - After the bad kfree(), afs_put_endpoint_state() and the probe code keep writing refcounts, flags and the addresses pointer into the freed estate. When the refcount later drops to zero it is freed a second time via call_rcu, so a reclaimed object gets corrupted.\nA:H - The freed estate is later used and double-freed, and on the create_failed and wait_for_creation failure paths `server` is NULL when server->endpoint_state is read. Either way the kernel oopses or panics."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/server.c"], "versions": [{"version": "d6aa05cd995830f6dcee7b139335edb266de38a6", "lessThan": "981d72663dee2fa6efaf202293e68d2b10a0d1d4", "status": "affected", "versionType": "git"}, {"version": "4882ba78574e2d8c579658f65f6784b0d139d173", "lessThan": "e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c", "status": "affected", "versionType": "git"}, {"version": "4882ba78574e2d8c579658f65f6784b0d139d173", "lessThan": "349e713039a1fd6659c27e7a66238bfa49ce37e9", "status": "affected", "versionType": "git"}, {"version": "4882ba78574e2d8c579658f65f6784b0d139d173", "lessThan": "044d596094af4b769fb8e1173dff0d08bd68db6c", "status": "affected", "versionType": "git"}, {"version": "6.12.101", "lessThan": "6.12.111", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/afs/server.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.12.101", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/981d72663dee2fa6efaf202293e68d2b10a0d1d4"}, {"url": "https://git.kernel.org/stable/c/e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c"}, {"url": "https://git.kernel.org/stable/c/349e713039a1fd6659c27e7a66238bfa49ce37e9"}, {"url": "https://git.kernel.org/stable/c/044d596094af4b769fb8e1173dff0d08bd68db6c"}], "title": "afs: Fix incorrect free in candidate cleanup in afs_lookup_server()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/afs/server.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "981d72663dee2fa6efaf202293e68d2b10a0d1d4", "status": "affected", "version": "d6aa05cd995830f6dcee7b139335edb266de38a6", "versionType": "git"}, {"lessThan": "e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c", "status": "affected", "version": "4882ba78574e2d8c579658f65f6784b0d139d173", "versionType": "git"}, {"lessThan": "349e713039a1fd6659c27e7a66238bfa49ce37e9", "status": "affected", "version": "4882ba78574e2d8c579658f65f6784b0d139d173", "versionType": "git"}, {"lessThan": "044d596094af4b769fb8e1173dff0d08bd68db6c", "status": "affected", "version": "4882ba78574e2d8c579658f65f6784b0d139d173", "versionType": "git"}, {"lessThan": "6.12.111", "status": "affected", "version": "6.12.101", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/afs/server.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix incorrect free in candidate cleanup in afs_lookup_server()\n\nFix afs_lookup_server() to not free an existing server's endpoint state\nwhen cleaning up a candidate server. The candidate record doesn't have an\nendpoint state yet at this point, so the free for that can just be removed."}], "id": "CVE-2026-97584", "lastModified": "2026-10-19T10:17:27.777", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-25T11:17:09.267", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/044d596094af4b769fb8e1173dff0d08bd68db6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/349e713039a1fd6659c27e7a66238bfa49ce37e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/981d72663dee2fa6efaf202293e68d2b10a0d1d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: afs: Fix incorrect free in candidate cleanup in afs_lookup_server()", "id": "2541073", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541073"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-826", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nafs: Fix incorrect free in candidate cleanup in afs_lookup_server()\nFix afs_lookup_server() to not free an existing server's endpoint state\nwhen cleaning up a candidate server. The candidate record doesn't have an\nendpoint state yet at this point, so the free for that can just be removed.", "A flaw was found in the Linux kernel's AFS (Andrew File System) subsystem. During server lookup operations, the candidate cleanup routine incorrectly frees memory associated with an existing server's endpoint state. A local user interacting with the filesystem could exploit this issue to trigger memory corruption, leading to a kernel crash and Denial of Service (DoS)."], "name": "CVE-2026-97584", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97584\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97584\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97584.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d6aa05cd995830f6dcee7b139335edb266de38a6,981d72663dee2fa6efaf202293e68d2b10a0d1d4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4882ba78574e2d8c579658f65f6784b0d139d173,e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4882ba78574e2d8c579658f65f6784b0d139d173,349e713039a1fd6659c27e7a66238bfa49ce37e9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4882ba78574e2d8c579658f65f6784b0d139d173,044d596094af4b769fb8e1173dff0d08bd68db6c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.101,6.12.111)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T18:00:17.579745+00:00", "updated": "2026-10-01T10:00:06.006418+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}