CVE-2026-63800

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63800", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.013Z", "datePublished": "2026-07-19T12:02:06.897Z", "dateUpdated": "2026-10-19T20:07:47.475Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:51:05.578Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."}], "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 - A compromised or malicious pNFS NFSv4.1+ metadata server can send CB_LAYOUTRECALL callbacks over the NFSv4 backchannel to force NFS_LAYOUT_RETURN while client file I/O reaches pnfs_update_layout(), exploiting the client from the network in typical enterprise/HPC pNFS deployments.\nAC:L - The attacker controls both sides of the race by issuing layout recalls from the server and driving or waiting for concurrent read/write I/O on the mounted pNFS share; no conditions beyond attacker influence are required once a pNFS session exists.\nPR:N - Exploitation requires no local privileges on the victim client\u2014a remote NFS server with an established pNFS session can trigger the layoutreturn/retry path while any client process performs permitted file I/O on the mount.\nUI:N - No interactive victim action is needed during exploitation; automated workloads, daemons, or batch jobs performing routine I/O on an existing pNFS mount are sufficient to hit the vulnerable code path.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross a VM, container, or IOMMU boundary on its own.\nC:H - The tracepoint reads freed pnfs_layout_hdr fields (plh_stateid seqid and hash) after pnfs_put_layout_hdr() drops the final reference, giving an attacker-controlled use-after-free read primitive over kernel heap memory.\nI:H - Use-after-free on a refcounted kernel layout object enables heap grooming and further memory corruption for arbitrary kernel writes or control-flow hijacking, not merely a bounded fault.\nA:H - Dereferencing a freed pnfs_layout_hdr in kernel context can cause an oops or panic, and use-after-free corruption reliably threatens system availability even when full exploitation is not attempted."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/pnfs.c"], "versions": [{"version": "06f58dbc49a23c99e5c0f246879ed16667f7bf8f", "lessThan": "4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "1f24b8302c77dcaf79c64c073877a3b9f4dd25d2", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "9c0fb5c09ae5bd68dc0038692af8127029cb0385", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "7e37e9b3e82ade881e1798e2f4fcc54aff7793c1", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "2883ddd7542b4437a2ab4908fe2773f690e20889", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "200e7637f4d6a1342987045eea72641524f909dc", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "9645aaf689aff57427ece3b9fa47d5b5399417f4", "status": "affected", "versionType": "git"}, {"version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "13e198a90ca4050f4bee8a3f23680389a6563ccc", "status": "affected", "versionType": "git"}, {"version": "aa2399f55eff4ec78330bb6fe55f9df53e5cae0c", "status": "affected", "versionType": "git"}, {"version": "5.10.9", "lessThan": "5.10.260", "status": "affected", "versionType": "semver"}, {"version": "5.4.91", "lessThan": "5.5", "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/nfs/pnfs.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.260", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.211", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.177", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.38", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.3", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.10.9", "versionEndExcluding": "5.10.260"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.211"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.177"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.144"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.95"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"}, {"url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"}, {"url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"}], "title": "pNFS: Fix use-after-free in pnfs_update_layout()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63800", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:30:40.400910Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:47.475Z"}}]}}

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The attacker controls both sides of the race by issuing layout recalls from the server and driving or waiting for concurrent read/write I/O on the mounted pNFS share; no conditions beyond attacker influence are required once a pNFS session exists.\nPR:N - Exploitation requires no local privileges on the victim client\u2014a remote NFS server with an established pNFS session can trigger the layoutreturn/retry path while any client process performs permitted file I/O on the mount.\nUI:N - No interactive victim action is needed during exploitation; automated workloads, daemons, or batch jobs performing routine I/O on an existing pNFS mount are sufficient to hit the vulnerable code path.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross a VM, container, or IOMMU boundary on its own.\nC:H - The tracepoint reads freed pnfs_layout_hdr fields (plh_stateid seqid and hash) after pnfs_put_layout_hdr() drops the final reference, giving an attacker-controlled use-after-free read primitive over kernel heap memory.\nI:H - Use-after-free on a refcounted kernel layout object enables heap grooming and further memory corruption for arbitrary kernel writes or control-flow hijacking, not merely a bounded fault.\nA:H - Dereferencing a freed pnfs_layout_hdr in kernel context can cause an oops or panic, and use-after-free corruption reliably threatens system availability even when full exploitation is not attempted."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "06f58dbc49a23c99e5c0f246879ed16667f7bf8f", "lessThan": "4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "1f24b8302c77dcaf79c64c073877a3b9f4dd25d2", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "9c0fb5c09ae5bd68dc0038692af8127029cb0385", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "7e37e9b3e82ade881e1798e2f4fcc54aff7793c1", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "2883ddd7542b4437a2ab4908fe2773f690e20889", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "200e7637f4d6a1342987045eea72641524f909dc", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "9645aaf689aff57427ece3b9fa47d5b5399417f4", "versionType": "git"}, {"status": "affected", "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704", "lessThan": "13e198a90ca4050f4bee8a3f23680389a6563ccc", "versionType": "git"}, {"status": "affected", "version": "aa2399f55eff4ec78330bb6fe55f9df53e5cae0c", "versionType": "git"}, {"status": "affected", "version": "5.10.9", "lessThan": "5.10.260", "versionType": "semver"}, {"status": "affected", "version": "5.4.91", "lessThan": "5.5", "versionType": "semver"}], "programFiles": ["fs/nfs/pnfs.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"status": "unaffected", "version": "0", "lessThan": "5.11", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.260", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.211", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.177", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.144", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.95", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.38", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.3", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfs/pnfs.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98"}, {"url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2"}, {"url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385"}, {"url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1"}, {"url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889"}, {"url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"}, {"url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"}, {"url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.260", "versionStartIncluding": "5.10.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.211", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.177", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.144", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.95", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.38", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.3", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.91"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:51:05.578Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63800", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:07:47.475Z", "dateReserved": "2026-07-19T07:54:57.013Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T12:02:06.897Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."}], "id": "CVE-2026-63800", "lastModified": "2026-10-19T20:19:20.310", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63800", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:30:40.400910Z", "version": "2.0.3"}}]}, "published": "2026-07-19T12:16:52.553", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: pNFS: Fix use-after-free in pnfs_update_layout()", "id": "2502219", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502219"}, "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-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npNFS: Fix use-after-free in pnfs_update_layout()\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).", "A flaw was found in the Linux kernel's parallel Network File System (pNFS) component. An issue in the `pnfs_update_layout()` function causes a use-after-free vulnerability due to incorrect ordering of memory management operations. This flaw can be triggered when the system attempts to update a pNFS layout, potentially leading to system instability, crashes, or a denial of service. In some scenarios, this type of memory corruption could be exploited by a local attacker to achieve arbitrary code execution."], "name": "CVE-2026-63800", "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": "Out of support scope", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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-2026-63800\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63800\nhttps://lore.kernel.org/linux-cve-announce/2026071901-CVE-2026-63800-dbef@gregkh/T"], "threat_severity": "Moderate"}

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