CVE-2026-80988

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf195a1a6fe416882984f8bd6c61afc1383171860 < 5eca0d899a3be661a7e2caaaa7467a6fa15d756caffected
LinuxLinuxf195a1a6fe416882984f8bd6c61afc1383171860 < 894e136b432da75c0352c80299807a5c4b04f167affected
LinuxLinuxf195a1a6fe416882984f8bd6c61afc1383171860 < 89177732fe1653bbfef10cf5d99bf20cf57762c2affected
LinuxLinuxf195a1a6fe416882984f8bd6c61afc1383171860 < 873ce713fef5dde0939220f04f3484ec86a16fbaaffected
LinuxLinuxaa6d6ed213b62cbdb09ea32abbfa085dd987a0c9affected
LinuxLinuxa8986a61ebee0b54c5d648444fbae09bd1c6dcd2affected
LinuxLinux94491412a2afc8a5aea4c5b455aed86d3486f0b1affected
LinuxLinux3cfdc448e8bfa8a7eaa5af87f357330566124b78affected
LinuxLinuxbfa051f650a7708183bd86901ca4645dcf88c486affected
LinuxLinux4f4af6b8b7a23fa37decaf43b55403e6bfd8e219affected
LinuxLinuxc2cd5d993f57f819d46fe62387d3cc34d8468e60affected
LinuxLinux449b1978d4e50b14b2a4de3a26d0b074593926a3affected
LinuxLinux4.14.326 < 4.15affected
LinuxLinux4.19.295 < 4.20affected
LinuxLinux5.4.257 < 5.5affected
LinuxLinux5.10.195 < 5.11affected
LinuxLinux5.15.132 < 5.16affected
LinuxLinux6.1.53 < 6.2affected
LinuxLinux6.4.16 < 6.5affected
LinuxLinux6.5.3 < 6.6affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References