CVE-2026-80988

NTB: ntb_transport: Fail TX enqueue when the QP link is down

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Aug 26, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3cfdc448e8bfa8a7eaa5af87f357330566124b78 to before 76c9ccc0c6bebfc74c0e727eda67687f5103ab06Affected bfa051f650a7708183bd86901ca4645dcf88c486 to before 96d792c65b9d5f7f9dd86a1004315db59e450c07Affected 4f4af6b8b7a23fa37decaf43b55403e6bfd8e219 to before 45cc11035165918dd1f81796ea98f81ece20d361Affected f195a1a6fe416882984f8bd6c61afc1383171860 to before e6cc541fab01099fd8efadfa4f13afdf118bf536Affected f195a1a6fe416882984f8bd6c61afc1383171860 to before 5eca0d899a3be661a7e2caaaa7467a6fa15d756cAffected f195a1a6fe416882984f8bd6c61afc1383171860 to before 894e136b432da75c0352c80299807a5c4b04f167Affected f195a1a6fe416882984f8bd6c61afc1383171860 to before 89177732fe1653bbfef10cf5d99bf20cf57762c2Affected f195a1a6fe416882984f8bd6c61afc1383171860 to before 873ce713fef5dde0939220f04f3484ec86a16fbaAffected aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9Affected a8986a61ebee0b54c5d648444fbae09bd1c6dcd2Affected 94491412a2afc8a5aea4c5b455aed86d3486f0b1Affected c2cd5d993f57f819d46fe62387d3cc34d8468e60Affected 449b1978d4e50b14b2a4de3a26d0b074593926a3Affected 5.10.195 to before 5.10.270Affected 5.15.132 to before 5.15.221Affected 6.1.53 to before 6.1.188Affected 4.14.326 to before 4.15Affected 4.19.295 to before 4.20Affected 5.4.257 to before 5.5Affected 6.4.16 to before 6.5Affected 6.5.3 to before 6.6Affected
LinuxLinux	6.6Affected before 6.6Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

3cfdc448e8bfa8a7eaa5af87f357330566124b78 to before 76c9ccc0c6bebfc74c0e727eda67687f5103ab06Affected
bfa051f650a7708183bd86901ca4645dcf88c486 to before 96d792c65b9d5f7f9dd86a1004315db59e450c07Affected
4f4af6b8b7a23fa37decaf43b55403e6bfd8e219 to before 45cc11035165918dd1f81796ea98f81ece20d361Affected
f195a1a6fe416882984f8bd6c61afc1383171860 to before e6cc541fab01099fd8efadfa4f13afdf118bf536Affected
f195a1a6fe416882984f8bd6c61afc1383171860 to before 5eca0d899a3be661a7e2caaaa7467a6fa15d756cAffected
f195a1a6fe416882984f8bd6c61afc1383171860 to before 894e136b432da75c0352c80299807a5c4b04f167Affected
f195a1a6fe416882984f8bd6c61afc1383171860 to before 89177732fe1653bbfef10cf5d99bf20cf57762c2Affected
f195a1a6fe416882984f8bd6c61afc1383171860 to before 873ce713fef5dde0939220f04f3484ec86a16fbaAffected
aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9Affected
a8986a61ebee0b54c5d648444fbae09bd1c6dcd2Affected
94491412a2afc8a5aea4c5b455aed86d3486f0b1Affected
c2cd5d993f57f819d46fe62387d3cc34d8468e60Affected
449b1978d4e50b14b2a4de3a26d0b074593926a3Affected
5.10.195 to before 5.10.270Affected
5.15.132 to before 5.15.221Affected
6.1.53 to before 6.1.188Affected
4.14.326 to before 4.15Affected
4.19.295 to before 4.20Affected
5.4.257 to before 5.5Affected
6.4.16 to before 6.5Affected
6.5.3 to before 6.6Affected

LinuxLinux

6.6Affected
before 6.6Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.