CVE-2026-89478sctp: drop a chunk if its transport was removed
- 9.8CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3fc072e7cb4a0ff251d13cfc2d24f62489cd9386
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < d7cb5ad832095dc4becfdb2a36007ffd50e49fb0
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 0422b092a3d43ca462932ff9f747731ca078d1d4
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 928fd7920ba37cc5637a211b9be979083413a2fa
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c6c86a5e62a4fec36692ddd64b9144b660f71f96
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1035bdef1efb9b1076d1a57b81e08c637ff08ecc
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3537961df2163258bddc230db0e18dc14e925ea6
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 03a9d10ecf71f54b2af8020935f2033d4a132be5
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/3fc072e7cb4a0ff251d13cfc2d24f62489cd9386 (opens in a new tab)
- https://git.kernel.org/stable/c/d7cb5ad832095dc4becfdb2a36007ffd50e49fb0 (opens in a new tab)
- https://git.kernel.org/stable/c/0422b092a3d43ca462932ff9f747731ca078d1d4 (opens in a new tab)
- https://git.kernel.org/stable/c/928fd7920ba37cc5637a211b9be979083413a2fa (opens in a new tab)
- https://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96 (opens in a new tab)
- https://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc (opens in a new tab)
- https://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6 (opens in a new tab)
- https://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76384 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89478)Record last updated .