CVE-2026-98568

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98568", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.357Z", "datePublished": "2026-10-18T15:18:34.562Z", "dateUpdated": "2026-10-30T12:38:26.027Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:38:26.027Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "e3e24f4c434c56952412f875b834aa9daaa4fb15", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "fcaf456092dc86fd5b0b523ac27ec0d114066931", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "45a67662bf8ce3aa5643accf98d328dfbb47eaf6", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "315d42ca39f69846662961c25dcf2bb07c350d14", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "a3c5eb6e382dd426a5e7eb08608897ed57167ff7", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "ff022fd9d0f0282c575e11778b96bd1b637503eb", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "481506a756dcd828ef42391cb08f38d8d96d38fc", "status": "affected", "versionType": "git"}, {"version": "d8be18c52dbc94989f6d74637b731af39cd3d902", "status": "affected", "versionType": "git"}, {"version": "3927dace523706cc00f808520eaf2125dd7c07b5", "status": "affected", "versionType": "git"}, {"version": "3.12.18", "lessThan": "3.13", "status": "affected", "versionType": "semver"}, {"version": "3.13.10", "lessThan": "3.14", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "3.14", "status": "affected"}, {"version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "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": "3.14", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e3e24f4c434c56952412f875b834aa9daaa4fb15"}, {"url": "https://git.kernel.org/stable/c/9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1"}, {"url": "https://git.kernel.org/stable/c/fcaf456092dc86fd5b0b523ac27ec0d114066931"}, {"url": "https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6"}, {"url": "https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14"}, {"url": "https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7"}, {"url": "https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb"}, {"url": "https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc"}], "title": "vxlan: use one headroom snapshot for neighbour replies", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e3e24f4c434c56952412f875b834aa9daaa4fb15", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "fcaf456092dc86fd5b0b523ac27ec0d114066931", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "45a67662bf8ce3aa5643accf98d328dfbb47eaf6", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "315d42ca39f69846662961c25dcf2bb07c350d14", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "a3c5eb6e382dd426a5e7eb08608897ed57167ff7", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "ff022fd9d0f0282c575e11778b96bd1b637503eb", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"lessThan": "481506a756dcd828ef42391cb08f38d8d96d38fc", "status": "affected", "version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "versionType": "git"}, {"status": "affected", "version": "d8be18c52dbc94989f6d74637b731af39cd3d902", "versionType": "git"}, {"status": "affected", "version": "3927dace523706cc00f808520eaf2125dd7c07b5", "versionType": "git"}, {"lessThan": "3.13", "status": "affected", "version": "3.12.18", "versionType": "semver"}, {"lessThan": "3.14", "status": "affected", "version": "3.13.10", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.14"}, {"lessThan": "3.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.55", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "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\nvxlan: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation."}], "id": "CVE-2026-98568", "lastModified": "2026-10-30T13:21:16.090", "metrics": {}, "published": "2026-10-18T16:17:09.000", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e3e24f4c434c56952412f875b834aa9daaa4fb15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fcaf456092dc86fd5b0b523ac27ec0d114066931"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vxlan: use one headroom snapshot for neighbour replies", "id": "2555006", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555006"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvxlan: use one headroom snapshot for neighbour replies\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\nSnapshot the headroom once and use that value for both allocation and\nreservation.", "A flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN) networking module. A race condition can occur when link properties are modified while neighbour advertisement reply packets are being processed, leading to inconsistent buffer size calculations. A local attacker could exploit this timing issue to cause an out-of-bounds write to kernel memory, resulting in a Denial of Service (DoS) via a system crash or potential memory corruption."], "name": "CVE-2026-98568", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98568\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98568\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98568.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa,45a67662bf8ce3aa5643accf98d328dfbb47eaf6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa,315d42ca39f69846662961c25dcf2bb07c350d14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa,a3c5eb6e382dd426a5e7eb08608897ed57167ff7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa,ff022fd9d0f0282c575e11778b96bd1b637503eb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa,481506a756dcd828ef42391cb08f38d8d96d38fc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d8be18c52dbc94989f6d74637b731af39cd3d902"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3927dace523706cc00f808520eaf2125dd7c07b5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.12.18,3.13)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.13.10,3.14)"}}], "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": "semver", "value": "3.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.55,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.9,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc5,*]"}}], "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": "2026-10-18T23:15:14.329866+00:00", "updated": "2026-10-22T22:00:15.042160+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}