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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-74588

sctp: keep chunk->transport in step with the list it is queued on

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: keep chunk->transport in step with the list it is queued on __sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport's transmitted list without updating chunk->transport: if (chunk->tsn_gap_acked) { list_move_tail(&chunk->transmitted_list, &transport->transmitted); continue; } The chunk then sits on a live transport's list while chunk->transport still names a different one. If that transport is removed - sctp_assoc_rm_peer() from an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk is left with a dangling pointer. sctp_assoc_rm_peer() scrubs peer->transmitted and asoc->outqueue.out_chunk_list, but the chunk is on neither. The pointer is not followed while tsn_gap_acked is set. A SACK that reneges on the TSN clears the flag, and the next SACK reaches tchunk->transport->flight_size -= sctp_data_size(tchunk); inside the freed transport. KASAN reports a slab-use-after-free read in sctp_check_transmitted(), freed from sctp_assoc_rm_peer(). Both the removal and the SACKs come from the association peer. Set chunk->transport at the move. The ordinary resend path needs nothing: it reaches its list_move_tail() only after sctp_packet_append_chunk() returned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the chunk by then. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6575fb17230814b48b471727c8410c0aadff9274affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6b9e2ea2057113f3393990ba646d2d97c719a80daffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 874a7c2b5e184f06134fdfde27e9ce9271bafe58affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1adf929121e13e0b19200bb9fef715b918d483feaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e2e7c1de0e226ca1b7fea2de57a6c9bca408709baffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2b3b5eec8b2c30ee237e3c31a6a38de9c39d804daffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5ccf35ef0ed6059cdf8b1f4606a6584d5b67166baffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9f2cf069a9a72a2d6b97ca8b4c70e714aac99749affected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.10.265 to ≤ 5.10.*unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.152 to ≤ 6.6.*unaffected
  • 6.12.104 to ≤ 6.12.*unaffected
  • 6.18.45 to ≤ 6.18.*unaffected
  • 7.1.9 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References