{"id":"CVE-2026-80988","title":"NTB: ntb_transport: Fail TX enqueue when the QP link is down","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_transport: Fail TX enqueue when the QP link is down\n\nCommit f195a1a6fe41 (\"ntb: Drop packets when qp link is down\") meant to\nmake ntb_transport_tx_enqueue() dr…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-772"],"vendor":"Linux","product":"Linux","affected":["Linux >= 3cfdc448e8bfa8a7eaa5af87f357330566124b78 < 76c9ccc0c6bebfc74c0e727eda67687f5103ab06","Linux >= bfa051f650a7708183bd86901ca4645dcf88c486 < 96d792c65b9d5f7f9dd86a1004315db59e450c07","Linux >= 4f4af6b8b7a23fa37decaf43b55403e6bfd8e219 < 45cc11035165918dd1f81796ea98f81ece20d361","Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < e6cc541fab01099fd8efadfa4f13afdf118bf536","Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 5eca0d899a3be661a7e2caaaa7467a6fa15d756c","Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 894e136b432da75c0352c80299807a5c4b04f167","Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 89177732fe1653bbfef10cf5d99bf20cf57762c2","Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 873ce713fef5dde0939220f04f3484ec86a16fba","Linux aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9","Linux a8986a61ebee0b54c5d648444fbae09bd1c6dcd2","Linux 94491412a2afc8a5aea4c5b455aed86d3486f0b1","Linux c2cd5d993f57f819d46fe62387d3cc34d8468e60","Linux 449b1978d4e50b14b2a4de3a26d0b074593926a3","Linux >= 5.10.195 < 5.10.270","Linux >= 5.15.132 < 5.15.221","Linux >= 6.1.53 < 6.1.188","Linux >= 4.14.326 < 4.15","Linux >= 4.19.295 < 4.20","Linux >= 5.4.257 < 5.5","Linux >= 6.4.16 < 6.5","Linux >= 6.5.3 < 6.6","Linux 6.6"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:46:12.548Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80988","references":[{"url":"https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06"},{"url":"https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07"},{"url":"https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361"},{"url":"https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536"},{"url":"https://git.kernel.org/stable/c/5eca0d899a3be661a7e2caaaa7467a6fa15d756c"},{"url":"https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167"},{"url":"https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2"},{"url":"https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80988.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80988"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532251"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80988"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80988"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80988.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00177,"epssPercentile":0.07153,"ingestedAt":"2026-09-14T15:23:07.454Z","slug":"CVE-2026-80988","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nNTB: ntb_transport: Fail TX enqueue when the QP link is down\n\nCommit f195a1a6fe41 (\"ntb: Drop packets when qp link is down\") meant to\nmake ntb_transport_tx_enqueue() drop packets submitted while the QP link\nis down, but it only returns 0 without consuming the packet. Zero means\nsuccess by this function's contract, so ntb_netdev reports NETDEV_TX_OK\nand forgets the skb: nothing queued it, nothing frees it, and it leaks,\none skb for every transmit racing a link-down.\n\nReturn -ENOLINK instead, restoring the contract that a non-zero return\nleaves the buffer owned by the caller. With the preceding patch,\nntb_netdev frees the skb on non-retryable enqueue failures and returns\nNETDEV_TX_OK, so a packet racing with link-down is dropped without leaking\nor entering a busy retry loop.\n\n## Affected\n\n- `Linux >= 3cfdc448e8bfa8a7eaa5af87f357330566124b78 < 76c9ccc0c6bebfc74c0e727eda67687f5103ab06`\n- `Linux >= bfa051f650a7708183bd86901ca4645dcf88c486 < 96d792c65b9d5f7f9dd86a1004315db59e450c07`\n- `Linux >= 4f4af6b8b7a23fa37decaf43b55403e6bfd8e219 < 45cc11035165918dd1f81796ea98f81ece20d361`\n- `Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < e6cc541fab01099fd8efadfa4f13afdf118bf536`\n- `Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 5eca0d899a3be661a7e2caaaa7467a6fa15d756c`\n- `Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 894e136b432da75c0352c80299807a5c4b04f167`\n- `Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 89177732fe1653bbfef10cf5d99bf20cf57762c2`\n- `Linux >= f195a1a6fe416882984f8bd6c61afc1383171860 < 873ce713fef5dde0939220f04f3484ec86a16fba`\n- `Linux aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9`\n- `Linux a8986a61ebee0b54c5d648444fbae09bd1c6dcd2`\n- `Linux 94491412a2afc8a5aea4c5b455aed86d3486f0b1`\n- `Linux c2cd5d993f57f819d46fe62387d3cc34d8468e60`\n- `Linux 449b1978d4e50b14b2a4de3a26d0b074593926a3`\n- `Linux >= 5.10.195 < 5.10.270`\n- `Linux >= 5.15.132 < 5.15.221`\n- `Linux >= 6.1.53 < 6.1.188`\n- `Linux >= 4.14.326 < 4.15`\n- `Linux >= 4.19.295 < 4.20`\n- `Linux >= 5.4.257 < 5.5`\n- `Linux >= 6.4.16 < 6.5`\n- `Linux >= 6.5.3 < 6.6`\n- `Linux 6.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80988.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204158,"id":"CVE-2026-80988","ts":1789490234530,"field":"cvss","old":null,"new":"5.5"},{"seq":204157,"id":"CVE-2026-80988","ts":1789490234530,"field":"severity","old":"none","new":"medium"},{"seq":147500,"id":"CVE-2026-80988","ts":1789270211152,"field":"cvss","old":null,"new":"4.1"},{"seq":147499,"id":"CVE-2026-80988","ts":1789270211152,"field":"severity","old":"none","new":"medium"},{"seq":109252,"id":"CVE-2026-80988","ts":1789183731152,"field":"cvss","old":null,"new":"4.1"},{"seq":109251,"id":"CVE-2026-80988","ts":1789183731152,"field":"severity","old":"none","new":"medium"}]}