net: atlantic: free stranded TX buffers on ring deinit

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74623
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:35 UTC
Updated2026-08-22 16:16:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: atlantic: free stranded TX buffers on ring deinit aq_vec_deinit() drains the TX rings with a single aq_ring_tx_clean() call, which frees at most AQ_CFG_TX_CLEAN_BUDGET (256) descriptors and stops at hw_head, which no longer moves once aq_vec_stop() has stopped the hardware and NAPI. Completed descriptors beyond the budget and everything still posted in [hw_head, sw_tail) keep their skb or xdp_frame when the interface goes down: aq_vec_ring_free() then frees the buffer ring and the references are lost for good. Today this is a silent memory leak on every interface down under TX/XDP_TX load. With the conversion of the RX path to page_pool posted for net-next it becomes much more visible: XDP_TX frames carry fragment references on the RX ring's page_pool, so a single stranded frame keeps the pool's inflight count above zero forever. page_pool_destroy() then never completes, the pool is leaked together with its pages, and "page_pool_release_retry() stalled pool shutdown" is warned every 60 seconds from that point on, on every ifdown, XDP detach or ring resize under XDP_TX load. Bring back aq_ring_tx_deinit() as it was before the removal and use it for teardown again, with one extension: TX rings can hold xdp_frames nowadays, so release those too. They are returned with xdp_return_frame() since this runs in process context.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eb36bedf28be6d986bdbcfa375bab08ffa45efd8 307d80193b4a4a75b8dc4e0d3162be3755abbed7 git Not specified
CNA Linux Linux affected eb36bedf28be6d986bdbcfa375bab08ffa45efd8 7a3e1481f4ee6c581bccc6bfc6c970aac5be7b0c git Not specified
CNA Linux Linux affected eb36bedf28be6d986bdbcfa375bab08ffa45efd8 3447641d361dcc5511841d986ad4d849b2900d9b git Not specified
CNA Linux Linux affected eb36bedf28be6d986bdbcfa375bab08ffa45efd8 b13202d401e1a20fec89b0cda733dcbaf279f79d git Not specified
CNA Linux Linux affected eb36bedf28be6d986bdbcfa375bab08ffa45efd8 dd633280de7fdfd60dc4fcf63d04e2ad95b43269 git Not specified
CNA Linux Linux affected eb36bedf28be6d986bdbcfa375bab08ffa45efd8 452636ea5410a96e02ebaaf80b21e3620b98e0dd git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 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/7a3e1481f4ee6c581bccc6bfc6c970aac5be7b0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/307d80193b4a4a75b8dc4e0d3162be3755abbed7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3447641d361dcc5511841d986ad4d849b2900d9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/452636ea5410a96e02ebaaf80b21e3620b98e0dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b13202d401e1a20fec89b0cda733dcbaf279f79d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd633280de7fdfd60dc4fcf63d04e2ad95b43269 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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