CVE-2026-80987

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The caller retains ownership of the\nbuffer, and the preceding netdev patch frees the skb when enqueue\nreturns this permanent error."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - ntb_transport_tx_enqueue() is reached from ntb_netdev_start_xmit() on the NTB virtual Ethernet device; in dual-controller/cluster deployments that interconnect carries routed or 802.1Q traffic, so a remote peer can induce full-MTU egress (software VLAN insertion adds VLAN_HLEN past the transport payload limit) without local access.\nAC:L - Any TX buffer longer than tx_max_frame minus the payload header deterministically takes the oversized path; VLAN devices default to the lowerdev MTU so tagged full-size frames always exceed the limit, and AF_PACKET allows MTU+VLAN_HLEN, with no race or uncontrolled layout.\nPR:N - The netdev TX path has no authentication or capability check; once the NTB link is up, any host exchanging traffic over the interconnect or a VLAN/service on it can cause oversized transmits without credentials on the victim.\nUI:N - Oversized frames are transmitted by the kernel networking stack during ordinary packet egress; no victim action such as mounting a device or opening a file is required.\nS:U - The defect leaks sk_buff memory on the transmitting host inside the same kernel authority; it is not a VM escape, IOMMU/DMA bypass, or corruption of the peer host over the NTB link.\nC:N - The oversized path never copies payload bytes and does not free or reuse the skb, so there is no out-of-bounds read, use-after-free, or other information-disclosure primitive.\nI:N - ntb_process_tx() refuses to DMA or memcpy an oversized buffer and only invokes the completion callback with a NULL pointer, so there is no out-of-bounds write, heap corruption, or control-flow hijacking.\nA:H - Enqueue returns success while the TX handler is called with a NULL skb and skips kfree, permanently leaking one sk_buff (and its pages/socket accounting) per oversized transmit; repeating this exhausts kernel memory and causes OOM denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/ntb/ntb_transport.c"], "versions": [{"version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "4890152a3069f5cb58cc24b08cfd5fe95e568fa1", "status": "affected", "versionType": "git"}, {"version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "668aa3238548584ca9772da9cf43ae8c2389bbf1", "status": "affected", "versionType": "git"}, {"version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "9b0fa8a9e1057614a533cc3f18b17f82aab028d8", "status": "affected", "versionType": "git"}, {"version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": 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"ssvc", "content": {"id": "CVE-2026-80987", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:21:52.922531Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:37.690Z"}}]}}

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VLAN devices default to the lowerdev MTU so tagged full-size frames always exceed the limit, and AF_PACKET allows MTU+VLAN_HLEN, with no race or uncontrolled layout.\nPR:N - The netdev TX path has no authentication or capability check; once the NTB link is up, any host exchanging traffic over the interconnect or a VLAN/service on it can cause oversized transmits without credentials on the victim.\nUI:N - Oversized frames are transmitted by the kernel networking stack during ordinary packet egress; no victim action such as mounting a device or opening a file is required.\nS:U - The defect leaks sk_buff memory on the transmitting host inside the same kernel authority; it is not a VM escape, IOMMU/DMA bypass, or corruption of the peer host over the NTB link.\nC:N - The oversized path never copies payload bytes and does not free or reuse the skb, so there is no out-of-bounds read, use-after-free, or other information-disclosure primitive.\nI:N - ntb_process_tx() refuses to DMA or memcpy an oversized buffer and only invokes the completion callback with a NULL pointer, so there is no out-of-bounds write, heap corruption, or control-flow hijacking.\nA:H - Enqueue returns success while the TX handler is called with a NULL skb and skips kfree, permanently leaking one sk_buff (and its pages/socket accounting) per oversized transmit; repeating this exhausts kernel memory and causes OOM 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": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "4890152a3069f5cb58cc24b08cfd5fe95e568fa1", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "668aa3238548584ca9772da9cf43ae8c2389bbf1", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "9b0fa8a9e1057614a533cc3f18b17f82aab028d8", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "a7f22105a7df8c7fd74d0af27ace6fa94fe03d87", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "6b6bbc6c878d64eacc60877df49fce7b1b6a08d0", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "75a604e9f1cfdebda421062fdf42225ca32154cd", "versionType": "git"}, {"status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7", "versionType": "git"}], "programFiles": ["drivers/ntb/ntb_transport.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.9"}, {"status": "unaffected", "version": "0", "lessThan": "3.9", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/ntb/ntb_transport.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4890152a3069f5cb58cc24b08cfd5fe95e568fa1"}, {"url": "https://git.kernel.org/stable/c/668aa3238548584ca9772da9cf43ae8c2389bbf1"}, {"url": "https://git.kernel.org/stable/c/9b0fa8a9e1057614a533cc3f18b17f82aab028d8"}, {"url": "https://git.kernel.org/stable/c/b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88"}, {"url": "https://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87"}, {"url": "https://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0"}, {"url": "https://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd"}, {"url": "https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_transport: Reject oversized TX buffers\n\nntb_process_tx() handles an oversized buffer by calling tx_handler()\nwith a NULL data pointer and returning success. ntb_netdev therefore\nneither frees the skb in its completion callback nor takes its enqueue\nerror path, leaking it.\n\nReject oversized buffers in ntb_transport_tx_enqueue() before acquiring\na queue entry and return -EMSGSIZE. The caller retains ownership of the\nbuffer, and the preceding netdev patch frees the skb when enqueue\nreturns this permanent error."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "3.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:11.577Z"}}}, "cveMetadata": {"cveId": "CVE-2026-80987", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:46:11.577Z", "dateReserved": "2026-08-26T14:34:25.811Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:42:45.574Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/ntb/ntb_transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4890152a3069f5cb58cc24b08cfd5fe95e568fa1", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "668aa3238548584ca9772da9cf43ae8c2389bbf1", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "9b0fa8a9e1057614a533cc3f18b17f82aab028d8", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "a7f22105a7df8c7fd74d0af27ace6fa94fe03d87", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "6b6bbc6c878d64eacc60877df49fce7b1b6a08d0", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "75a604e9f1cfdebda421062fdf42225ca32154cd", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}, {"lessThan": "a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7", "status": "affected", "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/ntb/ntb_transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.9"}, {"lessThan": "3.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "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\nNTB: ntb_transport: Reject oversized TX buffers\n\nntb_process_tx() handles an oversized buffer by calling tx_handler()\nwith a NULL data pointer and returning success. ntb_netdev therefore\nneither frees the skb in its completion callback nor takes its enqueue\nerror path, leaking it.\n\nReject oversized buffers in ntb_transport_tx_enqueue() before acquiring\na queue entry and return -EMSGSIZE. The caller retains ownership of the\nbuffer, and the preceding netdev patch frees the skb when enqueue\nreturns this permanent error."}], "id": "CVE-2026-80987", "lastModified": "2026-10-19T09:17:31.350", "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-2026-80987", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:21:52.922531Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:05.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4890152a3069f5cb58cc24b08cfd5fe95e568fa1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/668aa3238548584ca9772da9cf43ae8c2389bbf1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b0fa8a9e1057614a533cc3f18b17f82aab028d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: NTB transport memory leak due to oversized TX buffers", "id": "2532223", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532223"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel's Non-Transparent Bridge (NTB) transport module. When processing oversized transmit (TX) buffers, the system fails to properly free the allocated memory, leading to a memory leak. This continuous leakage of memory could eventually exhaust system resources, resulting in a Denial of Service (DoS) for affected systems."], "name": "CVE-2026-80987", "public_date": "2026-09-11T19:42:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80987\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80987\nhttps://git.kernel.org/stable/c/6b6bbc6c878d64eacc60877df49fce7b1b6a08d0\nhttps://git.kernel.org/stable/c/75a604e9f1cfdebda421062fdf42225ca32154cd\nhttps://git.kernel.org/stable/c/a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7\nhttps://git.kernel.org/stable/c/a7f22105a7df8c7fd74d0af27ace6fa94fe03d87"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fce8a7bb5b4bfb8a27324703fd5b002ee9247e90,a7f22105a7df8c7fd74d0af27ace6fa94fe03d87)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fce8a7bb5b4bfb8a27324703fd5b002ee9247e90,6b6bbc6c878d64eacc60877df49fce7b1b6a08d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fce8a7bb5b4bfb8a27324703fd5b002ee9247e90,75a604e9f1cfdebda421062fdf42225ca32154cd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fce8a7bb5b4bfb8a27324703fd5b002ee9247e90,a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7)"}}], "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": "3.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.109,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "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": "2026-09-12T02:00:07.483059+00:00", "updated": "2026-09-21T03:15:09.526701+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}