{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80987", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.811Z", "datePublished": "2026-09-11T19:42:45.574Z", "dateUpdated": "2026-10-19T08:46:11.577Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:11.577Z" }, "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." } ], "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": "b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88", "status": "affected", "versionType": "git" }, { "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "a7f22105a7df8c7fd74d0af27ace6fa94fe03d87", "status": "affected", "versionType": "git" }, { "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "6b6bbc6c878d64eacc60877df49fce7b1b6a08d0", "status": "affected", "versionType": "git" }, { "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "75a604e9f1cfdebda421062fdf42225ca32154cd", "status": "affected", "versionType": "git" }, { "version": "fce8a7bb5b4bfb8a27324703fd5b002ee9247e90", "lessThan": "a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ntb/ntb_transport.c" ], "versions": [ { "version": "3.9", "status": "affected" }, { "version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "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": "3.9", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "7.3" } ] } ] } ], "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" } ], "title": "NTB: ntb_transport: Reject oversized TX buffers", 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