CVE-2026-68287

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The report path runs in net/core/drop_monitor.c whenever a received packet is dropped or hardware-trapped; a remote unauthenticated attacker triggers it simply by sending packets that get dropped, and controls skb->len which feeds payload_len and thus the under-sized allocation.\nAC:L - On an affected build the attacker can drive the path at will, tuning packet length byte-by-byte to land the under-budgeted skb exactly at an allocator bucket boundary; no race or unpredictable state is involved.\nPR:N - Enabling packet-alert mode is the victim administrator's monitoring configuration; the attacker's own action is only sending packets that get dropped, which needs no account, credentials or privileges on the target.\nUI:N - The drop-report path is executed automatically by the kernel workqueue when packets are dropped; no local user action is needed.\nS:U - The under-allocated skb and the resulting skb_over_panic() are entirely within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:N - __nla_reserve() detects the overrun in skb_put() and panics before any data is written or read past the buffer, so no memory contents are disclosed to the attacker.\nI:N - skb_over_panic() aborts before the out-of-bounds payload copy occurs, so no adjacent memory is modified and no control-flow primitive is obtained.\nA:H - The size under-estimation makes skb_put() exceed skb->end, invoking skb_over_panic() which calls BUG() and takes down the machine, a complete and repeatable denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/drop_monitor.c"], "versions": [{"version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "1275a4769c126405c6c63b6372daff120ac679a6", "status": "affected", "versionType": "git"}, {"version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "0da8f531336b28a59b23e5a67d40eaed15906201", "status": "affected", "versionType": "git"}, {"version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "6048ed2dfb33426c8aef32f8d225ea91c66813db", "status": "affected", "versionType": "git"}, {"version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "925669d4cfd47a9019ab29b40676215bab5dae35", "status": "affected", "versionType": "git"}, {"version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "4a9e30764e80693bcf875c776170edce20f94fe0", "status": "affected", "versionType": "git"}, {"version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "7089f7ab99c89f443c92d8fcc585e63f2727f0b3", "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/core/drop_monitor.c"], "versions": [{"version": "5.4", "status": "affected"}, {"version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "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": "7.1.6", "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": "5.4", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1275a4769c126405c6c63b6372daff120ac679a6"}, {"url": "https://git.kernel.org/stable/c/0da8f531336b28a59b23e5a67d40eaed15906201"}, {"url": "https://git.kernel.org/stable/c/6048ed2dfb33426c8aef32f8d225ea91c66813db"}, {"url": "https://git.kernel.org/stable/c/925669d4cfd47a9019ab29b40676215bab5dae35"}, {"url": "https://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0"}, {"url": "https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"}], "title": "drop_monitor: fix size calculations for 64-bit attributes", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68287", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:46:36.312836Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-131", "description": "CWE-131 Incorrect Calculation of Buffer Size"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:58:59.639Z"}}]}}

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dropped or hardware-trapped; a remote unauthenticated attacker triggers it simply by sending packets that get dropped, and controls skb->len which feeds payload_len and thus the under-sized allocation.\nAC:L - On an affected build the attacker can drive the path at will, tuning packet length byte-by-byte to land the under-budgeted skb exactly at an allocator bucket boundary; no race or unpredictable state is involved.\nPR:N - Enabling packet-alert mode is the victim administrator's monitoring configuration; the attacker's own action is only sending packets that get dropped, which needs no account, credentials or privileges on the target.\nUI:N - The drop-report path is executed automatically by the kernel workqueue when packets are dropped; no local user action is needed.\nS:U - The under-allocated skb and the resulting skb_over_panic() are entirely within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:N - __nla_reserve() detects the overrun in skb_put() and panics before any data is written or read past the buffer, so no memory contents are disclosed to the attacker.\nI:N - skb_over_panic() aborts before the out-of-bounds payload copy occurs, so no adjacent memory is modified and no control-flow primitive is obtained.\nA:H - The size under-estimation makes skb_put() exceed skb->end, invoking skb_over_panic() which calls BUG() and takes down the machine, a complete and repeatable denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "1275a4769c126405c6c63b6372daff120ac679a6", "versionType": "git"}, {"status": "affected", "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "0da8f531336b28a59b23e5a67d40eaed15906201", "versionType": "git"}, {"status": "affected", "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "6048ed2dfb33426c8aef32f8d225ea91c66813db", "versionType": "git"}, {"status": "affected", "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "925669d4cfd47a9019ab29b40676215bab5dae35", "versionType": "git"}, {"status": "affected", "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "4a9e30764e80693bcf875c776170edce20f94fe0", "versionType": "git"}, {"status": "affected", "version": "ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f", "lessThan": "7089f7ab99c89f443c92d8fcc585e63f2727f0b3", "versionType": "git"}], "programFiles": ["net/core/drop_monitor.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.4"}, {"status": "unaffected", "version": "0", "lessThan": "5.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.189", "versionType": "semver", 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skb_put() is subsequently called.\n\nFix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.189", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.158", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.111", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.53", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": 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"versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\ndrop_monitor: fix size calculations for 64-bit attributes\n\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use\nnla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and\nNET_DM_ATTR_TIMESTAMP).\n\nOn 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,\nnla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for\n64-bit alignment.\n\nHowever, net_dm_packet_report_size() and net_dm_hw_packet_report_size()\nused nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)),\nbudgeting 12 bytes instead of up to 16 bytes.\n\nThis under-estimation of SKB size can lead to an skb_over_panic() when\n__nla_reserve() or skb_put() is subsequently called.\n\nFix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations."}], "id": "CVE-2026-68287", "lastModified": "2026-10-19T21:18:00.920", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68287", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:46:36.312836Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:18.010", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0da8f531336b28a59b23e5a67d40eaed15906201"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1275a4769c126405c6c63b6372daff120ac679a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6048ed2dfb33426c8aef32f8d225ea91c66813db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/925669d4cfd47a9019ab29b40676215bab5dae35"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-131"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Linux kernel: Denial of Service in drop_monitor due to incorrect size calculations", "id": "2513335", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513335"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/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:\ndrop_monitor: fix size calculations for 64-bit attributes\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use\nnla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and\nNET_DM_ATTR_TIMESTAMP).\nOn 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,\nnla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for\n64-bit alignment.\nHowever, net_dm_packet_report_size() and net_dm_hw_packet_report_size()\nused nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)),\nbudgeting 12 bytes instead of up to 16 bytes.\nThis under-estimation of SKB size can lead to an skb_over_panic() when\n__nla_reserve() or skb_put() is subsequently called.\nFix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations.", "A flaw was found in the Linux kernel's `drop_monitor` feature. Incorrect size calculations for 64-bit attributes on 32-bit architectures without efficient unaligned access support can lead to an under-estimation of internal buffer (SKB) size. This under-estimation may cause a kernel panic, resulting in a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-68287", "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": "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:enterprise_linux_nvidia:", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:02:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68287\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68287\nhttps://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0\nhttps://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f,4a9e30764e80693bcf875c776170edce20f94fe0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f,7089f7ab99c89f443c92d8fcc585e63f2727f0b3)"}}], "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": "5.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-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": "2026-08-10T15:30:05.872582+00:00", "updated": "2026-10-23T00:00:16.058753+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}