CVE-2026-74626

NTB: ntb_netdev: Preserve RX queue depth on allocation failure

State: Published
Severity: 7.5 High
Published: Aug 22, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

NTB: ntb_netdev: Preserve RX queue depth on allocation failure

ntb_netdev_rx_handler() hands the received skb to the network stack before allocating its replacement. If the allocation fails, nothing is reposted. Every failure therefore takes one buffer out of the RX queue while the interface remains up, and enough failures eventually stall reception.

A retry path could refill the queue later, but ntb_netdev has none. Allocate the replacement first instead. If that fails, drop the packet and repost the same skb. This keeps the queue full and lets packet delivery resume as soon as memory is available again.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	548c237c0a9972df5d1afaca38aa733ee577128d to before 6d7f8a23c130d768c0976c2578b214353674e18fAffected 548c237c0a9972df5d1afaca38aa733ee577128d to before 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5Affected 548c237c0a9972df5d1afaca38aa733ee577128d to before 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4Affected 548c237c0a9972df5d1afaca38aa733ee577128d to before fcaf8ba7e56bb73319ac107a63b907d59536192cAffected 548c237c0a9972df5d1afaca38aa733ee577128d to before 3f2a15f33f86f7bd5b920669fd40c06725d72a1eAffected 548c237c0a9972df5d1afaca38aa733ee577128d to before a4e340971fe8ccd245d206db4d43b2a0eec240bdAffected 548c237c0a9972df5d1afaca38aa733ee577128d to before 755fd7843f300d724caceabdf9bb13adc8701540Affected 548c237c0a9972df5d1afaca38aa733ee577128d to before d2121faf133ac3bf9531b53a7e21273649a08517Affected
LinuxLinux	3.9Affected before 3.9Not affected 5.10.267 through 5.10.Not affected 5.15.218 through 5.15.Not affected 6.1.185 through 6.1.Not affected 6.6.154 through 6.6.Not affected 6.12.106 through 6.12.Not affected 6.18.46 through 6.18.Not affected 7.1.9 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

548c237c0a9972df5d1afaca38aa733ee577128d to before 6d7f8a23c130d768c0976c2578b214353674e18fAffected
548c237c0a9972df5d1afaca38aa733ee577128d to before 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5Affected
548c237c0a9972df5d1afaca38aa733ee577128d to before 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4Affected
548c237c0a9972df5d1afaca38aa733ee577128d to before fcaf8ba7e56bb73319ac107a63b907d59536192cAffected
548c237c0a9972df5d1afaca38aa733ee577128d to before 3f2a15f33f86f7bd5b920669fd40c06725d72a1eAffected
548c237c0a9972df5d1afaca38aa733ee577128d to before a4e340971fe8ccd245d206db4d43b2a0eec240bdAffected
548c237c0a9972df5d1afaca38aa733ee577128d to before 755fd7843f300d724caceabdf9bb13adc8701540Affected
548c237c0a9972df5d1afaca38aa733ee577128d to before d2121faf133ac3bf9531b53a7e21273649a08517Affected

LinuxLinux

3.9Affected
before 3.9Not affected
5.10.267 through 5.10.*Not affected
5.15.218 through 5.15.*Not affected
6.1.185 through 6.1.*Not affected
6.6.154 through 6.6.*Not affected
6.12.106 through 6.12.*Not affected
6.18.46 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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