sctp: do asoc update earlier in sctp_sf_do_dupcook_a

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2021-46999
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-02-28 09:15:38 UTC
Updated2026-08-04 10:16:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sctp: do asoc update earlier in sctp_sf_do_dupcook_a There's a panic that occurs in a few of envs, the call trace is as below: [] general protection fault, ... 0x29acd70f1000a: 0000 [#1] SMP PTI [] RIP: 0010:sctp_ulpevent_notify_peer_addr_change+0x4b/0x1fa [sctp] [] sctp_assoc_control_transport+0x1b9/0x210 [sctp] [] sctp_do_8_2_transport_strike.isra.16+0x15c/0x220 [sctp] [] sctp_cmd_interpreter.isra.21+0x1231/0x1a10 [sctp] [] sctp_do_sm+0xc3/0x2a0 [sctp] [] sctp_generate_timeout_event+0x81/0xf0 [sctp] This is caused by a transport use-after-free issue. When processing a duplicate COOKIE-ECHO chunk in sctp_sf_do_dupcook_a(), both COOKIE-ACK and SHUTDOWN chunks are allocated with the transort from the new asoc. However, later in the sideeffect machine, the old asoc is used to send them out and old asoc's shutdown_last_sent_to is set to the transport that SHUTDOWN chunk attached to in sctp_cmd_setup_t2(), which actually belongs to the new asoc. After the new_asoc is freed and the old asoc T2 timeout, the old asoc's shutdown_last_sent_to that is already freed would be accessed in sctp_sf_t2_timer_expire(). Thanks Alexander and Jere for helping dig into this issue. To fix it, this patch is to do the asoc update first, then allocate the COOKIE-ACK and SHUTDOWN chunks with the 'updated' old asoc. This would make more sense, as a chunk from an asoc shouldn't be sent out with another asoc. We had fixed quite a few issues caused by this.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected db8bf823e70f239372c62f13e4eb6f08a1665e8c d624f2991b977821375fbd56c91b0c91d456a697 git Not specified
CNA Linux Linux affected a204d577be70e0a0a6023cf1b9859c9ebffaeecd b1b31948c0af44628e43353828453461bb74098f git Not specified
CNA Linux Linux affected 145cb2f7177d94bc54563ed26027e952ee0ae03c f01988ecf3654f805282dce2d3bb9afe68d2691e git Not specified
CNA Linux Linux affected 145cb2f7177d94bc54563ed26027e952ee0ae03c 61b877bad9bb0d82b7d8841be50872557090a704 git Not specified
CNA Linux Linux affected 145cb2f7177d94bc54563ed26027e952ee0ae03c 0bfd913c2121b3d553bfd52810fe6061d542d625 git Not specified
CNA Linux Linux affected 145cb2f7177d94bc54563ed26027e952ee0ae03c 35b4f24415c854cd718ccdf38dbea6297f010aae git Not specified
CNA Linux Linux affected a5ce8531ea508d270822b2bc6140c6198c8a2a7b git Not specified
CNA Linux Linux affected 4.19.123 4.19.191 semver Not specified
CNA Linux Linux affected 5.4.41 5.4.120 semver Not specified
CNA Linux Linux affected 5.6.13 5.7 semver Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 4.19.191 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.120 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.38 5.10.* semver Not specified
CNA Linux Linux unaffected 5.11.22 5.11.* semver Not specified
CNA Linux Linux unaffected 5.12.5 5.12.* semver Not specified
CNA Linux Linux unaffected 5.13 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f01988ecf3654f805282dce2d3bb9afe68d2691e af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b1b31948c0af44628e43353828453461bb74098f af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/61b877bad9bb0d82b7d8841be50872557090a704 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/0bfd913c2121b3d553bfd52810fe6061d542d625 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/d624f2991b977821375fbd56c91b0c91d456a697 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/35b4f24415c854cd718ccdf38dbea6297f010aae af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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