{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53218", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.392Z", "datePublished": "2026-06-25T08:39:21.069Z", "dateUpdated": "2026-06-25T08:39:21.069Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-25T08:39:21.069Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_exthdr: fix register tracking for F_PRESENT flag\n\nnft_exthdr_init() passes user-controlled priv->len to\nnft_parse_register_store(), which marks that many bytes in the\nregister bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT\nis set, the eval paths write only 1 byte (nft_reg_store8) or\n4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4,\nregisters beyond the first are never written, retaining\nuninitialized stack data from nft_regs.\n\nBail out if userspace requests too much data when F_PRESENT is set."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nft_exthdr.c"], "versions": [{"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "19748967d59c31d24d21d40b728570788310b237", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "46fc15a044e9938e7ea77786fb37edd2cd74f031", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "cd513e43b4b2bd1de39e2367bc4261c699a8652f", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "67b27434c43b68a97becda98c9f0c8cf6cba2134", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "78069a6d8bc86c9e036eb82c2af4a19cc1871a53", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265", "status": "affected", "versionType": "git"}, {"version": "c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783", "lessThan": "772cecf198da732faebb5dcfc46d66a505be8495", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nft_exthdr.c"], "versions": [{"version": "4.11", "status": "affected"}, {"version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "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": "4.11", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6"}, {"url": "https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237"}, {"url": "https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031"}, {"url": "https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652f"}, {"url": "https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134"}, {"url": "https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53"}, {"url": "https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265"}, {"url": "https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495"}], "title": "netfilter: nft_exthdr: fix register tracking for F_PRESENT flag", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{}

{"bugzilla": {"description": "kernel: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag", "id": "2492721", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492721"}, "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-824", "details": ["A flaw was found in the Linux kernel's netfilter component. This vulnerability occurs in the `nft_exthdr` module when handling user-controlled data lengths with a specific flag, `NFT_EXTHDR_F_PRESENT`, enabled. An attacker could exploit this by providing a crafted input, leading to the exposure of uninitialized stack memory. This information disclosure could potentially reveal sensitive system data."], "name": "CVE-2026-53218", "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": "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"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53218\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53218\nhttps://lore.kernel.org/linux-cve-announce/2026062505-CVE-2026-53218-d36e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,19748967d59c31d24d21d40b728570788310b237)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,46fc15a044e9938e7ea77786fb37edd2cd74f031)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,cd513e43b4b2bd1de39e2367bc4261c699a8652f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,67b27434c43b68a97becda98c9f0c8cf6cba2134)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,78069a6d8bc86c9e036eb82c2af4a19cc1871a53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783,772cecf198da732faebb5dcfc46d66a505be8495)"}}], "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": "4.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.259,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.210,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.176,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.143,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.94,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-06-25T12:00:14.022900+00:00", "updated": "2026-06-26T13:45:05.808010+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-457", "CWE-824"]}