CVE-2026-89478Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: sctp: drop a chunk if its transport was removed sctp_rcv() resolves the transport once per packet and leaves it in chunk->transport. The lookup reference, or the one s…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.9
none → medium
— → 9.8
none → critical
9.8 → 5.9
critical → medium
5.9 → 9.8
medium → critical
9.8 → 7
critical → high
0.2% → 0.8%
7 → 9.8
high → critical
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
sctp: drop a chunk if its transport was removed
sctp_rcv() resolves the transport once per packet and leaves it in chunk->transport. The lookup reference, or the one sctp_add_backlog() takes if the socket is owned by userspace, keeps it around until the chunk has been processed.
An authenticated ASCONF DEL-IP can remove it in the meantime. sctp_assoc_rm_peer() takes the transport out of the association and calls sctp_transport_free(), which tags it dead and drops the reference the association held. There is a window on both paths: the packet can sit on the socket backlog, and on the direct path the lookup completes before bh_lock_sock().
The DATA chunk in that packet puts the removed transport back into asoc->peer.last_data_from. Once the packet is done that reference goes away and the transport is freed by RCU, so the next delayed SACK carries the pointer into the SACK chunk and sctp_outq_select_transport() reads the freed transport's state.
Drop the chunk in sctp_inq_push(), next to the existing rcvr->dead check. Both paths reach it with the association's socket lock held. The peer retransmits it.
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3fc072e7cb4a0ff251d13cfc2d24f62489cd9386Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d7cb5ad832095dc4becfdb2a36007ffd50e49fb0Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0422b092a3d43ca462932ff9f747731ca078d1d4Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 928fd7920ba37cc5637a211b9be979083413a2faLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c6c86a5e62a4fec36692ddd64b9144b660f71f96Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1035bdef1efb9b1076d1a57b81e08c637ff08eccLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3537961df2163258bddc230db0e18dc14e925ea6Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 03a9d10ecf71f54b2af8020935f2033d4a132be5Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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