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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: purge outqueue on stale COOKIE-ECHO handling\n\nsctp_stream_update() is only invoked when the association is moved into\nCOOKIE_WAIT during association setup/reconfiguration. In this path, the\noutbound stream scheduler state (stream-\u003eout_curr) is expected to be\nclean, since no user data should have been transmitted yet unless the\nstate machine has already partially progressed.\n\nHowever, a corner case exists in sctp_sf_do_5_2_6_stale(): when a\nStale Cookie ERROR is received, the association is rolled back from\nCOOKIE_ECHOED to COOKIE_WAIT. In this scenario, user data may already\nhave been queued and even bundled with the COOKIE-ECHO chunk.\n\nDuring the rollback, sctp_stream_update() frees the old stream table\nand installs a new one, but it does not invalidate stream-\u003eout_curr.\nAs a result, out_curr may still point to a freed sctp_stream_out\nentry from the previous stream state.\n\nLater, SCTP scheduler dequeue paths (FCFS, RR, PRIO, etc.) rely on\nstream-\u003eout_curr-\u003eext, which can lead to use-after-free once the old\nstream state has been released via sctp_stream_free().\n\nThis results in crashes such as (reported by Yuqi):\n\n  BUG: KASAN: slab-use-after-free in sctp_sched_fcfs_dequeue+0x13a/0x140\n  Read of size 8 at addr ff1100004d4d3208 by task mini_poc/9312\n  CPU: 1 UID: 1001 PID: 9312 Comm: mini_poc Not tainted\n     7.1.0-rc1-00305-gbd3a4795d574 #5 PREEMPT(full)\n   sctp_sched_fcfs_dequeue+0x13a/0x140\n   sctp_outq_flush+0x1603/0x33e0\n   sctp_do_sm+0x31c9/0x5d30\n   sctp_assoc_bh_rcv+0x392/0x6f0\n   sctp_inq_push+0x1db/0x270\n   sctp_rcv+0x138d/0x3c10\n\nFix this by fully purging the association outqueue when handling the\nStale Cookie case. This ensures all pending transmit and retransmit\nstate is dropped, and any scheduler cached pointers are invalidated,\nmaking it safe to rebuild stream state during COOKIE_WAIT restart.\n\nUpdating only stream-\u003eout_curr would be insufficient, since queued\nand retransmittable data would still reference the old stream state and\ntrigger later use-after-free in dequeue paths."
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              "value": "AV:N - The vulnerable SCTP state-machine path is reached by received SCTP packets, specifically an ERROR chunk with a Stale Cookie cause sent by the remote SCTP peer during COOKIE_ECHOED handling.\nAC:L - A malicious SCTP peer can drive the required handshake state and send the stale-cookie ERROR; no race or hard-to-control kernel condition is required once data has been queued for COOKIE-ECHO bundling.\nPR:N - The triggering packet is accepted from the network after SCTP verification-tag checks, but those are protocol state checks rather than authentication or privileges. No local account or administrative capability is required for a remote peer.\nUI:N - Exploitation does not require a human user action; it can occur during normal SCTP association setup and data transmission with a malicious peer.\nS:U - The impact is within the Linux kernel networking stack on the same system and does not cross a separate security authority such as a hypervisor or sandbox boundary.\nC:H - The bug leaves stream-\u003eout_curr pointing at freed stream state, creating a use-after-free in scheduler dequeue paths. Per kernel CVSS guidance, use-after-free memory corruption can be leveraged for high confidentiality impact.\nI:H - The stale pointer use-after-free is kernel heap memory corruption and may be exploitable beyond a crash via heap manipulation. Per the required guidance, UAFs warrant high integrity impact.\nA:H - The reported failure is a KASAN slab-use-after-free in SCTP dequeue leading to a kernel crash/oops. This provides high availability impact."
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