NTB: ntb_netdev: Preserve RX queue depth on allocation failure

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Summary

CVECVE-2026-74626
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:35 UTC
Updated2026-08-23 13:16:47 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 548c237c0a9972df5d1afaca38aa733ee577128d a4e340971fe8ccd245d206db4d43b2a0eec240bd git Not specified
CNA Linux Linux affected 548c237c0a9972df5d1afaca38aa733ee577128d 755fd7843f300d724caceabdf9bb13adc8701540 git Not specified
CNA Linux Linux affected 548c237c0a9972df5d1afaca38aa733ee577128d d2121faf133ac3bf9531b53a7e21273649a08517 git Not specified
CNA Linux Linux affected 3.9 Not specified
CNA Linux Linux unaffected 3.9 semver Not specified
CNA Linux Linux unaffected 6.18.46 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a4e340971fe8ccd245d206db4d43b2a0eec240bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/755fd7843f300d724caceabdf9bb13adc8701540 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2121faf133ac3bf9531b53a7e21273649a08517 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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