221 lines
10 KiB
JSON
221 lines
10 KiB
JSON
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nch_ktls: Fix kernel panic\n\nTaking page refcount is not ideal and causes kernel panic\nsometimes. It's better to take tx_ctx lock for the complete\nskb transmit, to avoid page cleanup if ACK received in middle."
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"value": "AV:N - The free side of the race is driven by TCP ACK processing (tls_icsk_clean_acked) on packets from a remote peer of a Chelsio kTLS-offloaded TLS service, matching network-reachable kTLS/peer-triggered bugs.\nAC:L - A remote peer can induce TX (e.g., request a large response) and control ACK timing, so the attacker influences both sides of the unlocked record-use vs. destroy_record race.\nPR:N - Any unauthenticated network client that can complete a TCP connection to a service using Chelsio HW kTLS TX can send the ACKs that free records; no local privileges are required.\nUI:N - Exploitation requires only the attacker’s own connection and carefully timed ACKs; no separate victim user action is needed.\nS:U - Impact is confined to the host kernel authority (panic or privilege escalation on the same system); there is no VM/IOMMU/sandbox boundary crossing.\nC:H - After destroy_record kfree’s the tls_record_info, TX still reads record metadata and frags (including kmap/memcpy of page contents), so the UAF can yield arbitrary kernel read primitives.\nI:H - UAF of the record while chcr_ktls_copy_record_in_skb and related TX handlers consume frags enables heap reuse and control-flow/data corruption primitives toward code execution.\nA:H - The fix explicitly addresses a kernel panic from racing ACK-driven page/record cleanup during TX, so availability impact is a full kernel crash."
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