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CVE-2026-80988— NTB: ntb_transport: Fail TX enqueue when the QP link is down

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： NTB：ntb_transport：当 QP 链路断开时，使 TX 入队操作失败 提交 f195a1a6fe41（“ntb：当 QP 链路断开时丢弃数据包”）本意是让 在 QP 链路断开期间提交的数据包被丢弃，但该补丁仅返回 0 而未消耗数据包。根据该函数的契约，返回 0 表示成功，因此 会上报 ，而内核则“忘记”了该 skb：没有人将其入队，也没有人释放它，导致内存泄漏——每次链路断开期间发生并发发送时，都会泄漏一个 skb。 现在改为返回 ，从而恢复“非零返回值意味

AI Predicted 5.6 Difficulty: Moderate

Affected Version Matrix 26

VendorProduct Version RangeStatus
Linux Linux f195a1a6fe416882984f8bd6c61afc1383171860< 5eca0d899a3be661a7e2caaaa7467a6fa15d756c affected
f195a1a6fe416882984f8bd6c61afc1383171860< 894e136b432da75c0352c80299807a5c4b04f167 affected
f195a1a6fe416882984f8bd6c61afc1383171860< 89177732fe1653bbfef10cf5d99bf20cf57762c2 affected
f195a1a6fe416882984f8bd6c61afc1383171860< 873ce713fef5dde0939220f04f3484ec86a16fba affected
aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9 affected
a8986a61ebee0b54c5d648444fbae09bd1c6dcd2 affected
94491412a2afc8a5aea4c5b455aed86d3486f0b1 affected
3cfdc448e8bfa8a7eaa5af87f357330566124b78 affected
… +18 more rows
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I. Basic Information for CVE-2026-80988

Vulnerability Information
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Vulnerability Title
NTB: ntb_transport: Fail TX enqueue when the QP link is down
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f195a1a6fe416882984f8bd6c61afc1383171860 ~ 5eca0d899a3be661a7e2caaaa7467a6fa15d756c -
Linux Linux 6.6 -

II. Public POCs for CVE-2026-80988

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III. Intelligence Information for CVE-2026-80988

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Other References for CVE-2026-80988 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89490 ocfs2: fix readdir position truncation on 32-bit kernels
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89502 ring-buffer: Free cpu_buffer::free_page with subbuf_order

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80988

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