CVE-2022-49838

published 2025-05-01

CVE-2022-49838: In the Linux kernel, the following vulnerability has been resolved: sctp: clear out_curr if all frag chunks of current msg are pruned A crash was reported by…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

sctp: clear out_curr if all frag chunks of current msg are pruned

A crash was reported by Zhen Chen:

list_del corruption, ffffa035ddf01c18->next is NULL
WARNING: CPU: 1 PID: 250682 at lib/list_debug.c:49 __list_del_entry_valid+0x59/0xe0
RIP: 0010:__list_del_entry_valid+0x59/0xe0
Call Trace:
sctp_sched_dequeue_common+0x17/0x70 [sctp]
sctp_sched_fcfs_dequeue+0x37/0x50 [sctp]
sctp_outq_flush_data+0x85/0x360 [sctp]
sctp_outq_uncork+0x77/0xa0 [sctp]
sctp_cmd_interpreter.constprop.0+0x164/0x1450 [sctp]
sctp_side_effects+0x37/0xe0 [sctp]
sctp_do_sm+0xd0/0x230 [sctp]
sctp_primitive_SEND+0x2f/0x40 [sctp]
sctp_sendmsg_to_asoc+0x3fa/0x5c0 [sctp]
sctp_sendmsg+0x3d5/0x440 [sctp]
sock_sendmsg+0x5b/0x70

and in sctp_sched_fcfs_dequeue() it dequeued a chunk from stream
out_curr outq while this outq was empty.

Normally stream->out_curr must be set to NULL once all frag chunks of
current msg are dequeued, as we can see in sctp_sched_dequeue_done().
However, in sctp_prsctp_prune_unsent() as it is not a proper dequeue,
sctp_sched_dequeue_done() is not called to do this.

This patch is to fix it by simply setting out_curr to NULL when the
last frag chunk of current msg is dequeued from out_curr stream in
sctp_prsctp_prune_unsent().

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.0.10-1 (bookworm)	linux 6.0.10-1 (bookworm)
linux	linux	—	—
linux	linux	>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < e27458b18b35caee4b27b37a4a9c503b93cae5cc	e27458b18b35caee4b27b37a4a9c503b93cae5cc
linux	linux	>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 2ea600b598dd3e061854dd4dd5b4c815397dfcea	2ea600b598dd3e061854dd4dd5b4c815397dfcea
linux	linux	>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 3eff34e01062ec08fbb45ce2baaaa644550be821	3eff34e01062ec08fbb45ce2baaaa644550be821
linux	linux	>= 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 < 2f201ae14ae0f91dbf1cffea7bb1e29e81d4d108	2f201ae14ae0f91dbf1cffea7bb1e29e81d4d108
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.158-1	5.10.158-1
linux	linux_kernel	>= 0 < 6.0.10-1	6.0.10-1
linux	linux_kernel	>= 0 < 6.0.10-1	6.0.10-1
linux	linux_kernel	>= 0 < 6.0.10-1	6.0.10-1
linux	linux_kernel	>= 4.15 < 5.10.156	5.10.156
linux	linux_kernel	>= 5.11 < 5.15.81	5.15.81
linux	linux_kernel	>= 5.16 < 6.0.10	6.0.10

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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