CVE-2022-49838

MEDIUM EPSS 7.3%
Published May 1, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 1, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

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().

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
7.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥4.15  –  <5.10.156
linuxlinux_kernel*≥5.11  –  <5.15.81
linuxlinux_kernel*≥5.16  –  <6.0.10
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/2ea600b598dd3e061854dd4dd5b4c815397dfcea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2f201ae14ae0f91dbf1cffea7bb1e29e81d4d108
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3eff34e01062ec08fbb45ce2baaaa644550be821
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e27458b18b35caee4b27b37a4a9c503b93cae5cc
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2ea600b598dd3e061854dd4dd5b4c815397dfcea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2f201ae14ae0f91dbf1cffea7bb1e29e81d4d108
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3eff34e01062ec08fbb45ce2baaaa644550be821
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e27458b18b35caee4b27b37a4a9c503b93cae5cc
    Patch