NTB: ntb_transport: Fail TX enqueue when the QP link is down
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 1 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.10.195 to before 5.10.270; 5.15.132 to before 5.15.221; 6.1.53 to before 6.1.188; 4.14.326 to before 4.15; 4.19.295 to before 4.20; 5.4.257 to before 5.5; 6.4.16 to before 6.5; 6.5.3 to before 6.6 | 5.10.270, 5.15.221, 6.1.188, 4.15, 4.20, 5.5, 6.5, 6.6 | Patch available | CNA |
| Linux | Linux | 6.6 and later | 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 5.10.195 to before 5.10.270; 5.15.132 to before 5.15.221; 6.1.53 to before 6.1.188; 4.14.326 to before 4.15; 4.19.295 to before 4.20; 5.4.257 to before 5.5; 6.4.16 to before 6.5; 6.5.3 to before 6.6 Fixed in 5.10.270, 5.15.221, 6.1.188, 4.15, 4.20, 5.5, 6.5, 6.6 Patch available CNA
- Linux VendorLinux Affected 6.6 and later Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 4.15, 4.20, 5.5, 6.5, 6.6
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
Not affected: 6 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-80988
- 2026-10-03 Alias added: GHSA-hx33-h33p-95h8
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/76c9ccc0c6bebfc74c0e727eda67687f5103ab06
- https://git.kernel.org/stable/c/96d792c65b9d5f7f9dd86a1004315db59e450c07
- https://git.kernel.org/stable/c/45cc11035165918dd1f81796ea98f81ece20d361
- https://git.kernel.org/stable/c/e6cc541fab01099fd8efadfa4f13afdf118bf536
- https://git.kernel.org/stable/c/5eca0d899a3be661a7e2caaaa7467a6fa15d756c
- https://git.kernel.org/stable/c/894e136b432da75c0352c80299807a5c4b04f167
- https://git.kernel.org/stable/c/89177732fe1653bbfef10cf5d99bf20cf57762c2
- https://git.kernel.org/stable/c/873ce713fef5dde0939220f04f3484ec86a16fba
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- TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
Sources
- CVE-2026-80988 · CVE Program
- CVE-2026-80988 · NVD
- FIRST EPSS
- GHSA-hx33-h33p-95h8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-80988 · Red Hat security data · CC BY 4.0
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