CVE-2026-80988

In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Fail TX enqueue when the QP link is down Commit f195a1a6fe41 ("ntb: Drop packets when qp link is down") meant to make ntb_transport_tx_enqueue() drop packets submitted while the QP link is down, but it only returns 0 without consuming the packet. Zero means success by this function's contract, so ntb_netdev reports NETDEV_TX_OK and forgets the skb: nothing queued it, nothing frees it, and it leaks, one skb for every transmit racing a link-down. Return -ENOLINK instead, restoring the contract that a non-zero return leaves the buffer owned by the caller. With the preceding patch, ntb_netdev frees the skb on non-retryable enqueue failures and returns NETDEV_TX_OK, so a packet racing with link-down is dropped without leaking or entering a busy retry loop.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361
https://git.kernel.org/stable/c/5eca0d899a3be661a7e2caaaa7467a6fa15d756c
https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06
https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba
https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2
https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167
https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07
https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:18

NVD link : CVE-2026-80988

Mitre link : CVE-2026-80988

CVE.ORG link : CVE-2026-80988

JSON object : View

Products Affected

No product.

CWE

No CWE.

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"449b1978d4e50b14b2a4de3a26d0b074593926a3", "versionType": "git"}, {"status": "affected", "version": "5.10.195", "lessThan": "5.10.270", "versionType": "semver"}, {"status": "affected", "version": "5.15.132", "lessThan": "5.15.221", "versionType": "semver"}, {"status": "affected", "version": "6.1.53", "lessThan": "6.1.188", "versionType": "semver"}, {"status": "affected", "version": "4.14.326", "lessThan": "4.15", "versionType": "semver"}, {"status": "affected", "version": "4.19.295", "lessThan": "4.20", "versionType": "semver"}, {"status": "affected", "version": "5.4.257", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "6.4.16", "lessThan": "6.5", "versionType": "semver"}, {"status": "affected", "version": "6.5.3", "lessThan": "6.6", "versionType": "semver"}], "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", 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["drivers/ntb/ntb_transport.c"], "defaultStatus": "affected"}]}], "published": "2026-09-11T20:19:05.480", "references": [{"url": "https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5eca0d899a3be661a7e2caaaa7467a6fa15d756c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "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() 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."}], "lastModified": "2026-09-14T13:18:53.493", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}