CVE-2022-49838
Full vulnerability record from the local CVENow database.
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().
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-05-01 15:16:07.290000
Last modified
2026-11-05 20:17:15.853000
View original CVE JSON
{
"id": "CVE-2022-49838",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-05-01T15:16:07.290",
"lastModified": "2026-11-05T20:17:15.853",
"vulnStatus": "Analyzed",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear out_curr if all frag chunks of current msg are pruned\n\nA crash was reported by Zhen Chen:\n\n list_del corruption, ffffa035ddf01c18->next is NULL\n WARNING: CPU: 1 PID: 250682 at lib/list_debug.c:49 __list_del_entry_valid+0x59/0xe0\n RIP: 0010:__list_del_entry_valid+0x59/0xe0\n Call Trace:\n sctp_sched_dequeue_common+0x17/0x70 [sctp]\n sctp_sched_fcfs_dequeue+0x37/0x50 [sctp]\n sctp_outq_flush_data+0x85/0x360 [sctp]\n sctp_outq_uncork+0x77/0xa0 [sctp]\n sctp_cmd_interpreter.constprop.0+0x164/0x1450 [sctp]\n sctp_side_effects+0x37/0xe0 [sctp]\n sctp_do_sm+0xd0/0x230 [sctp]\n sctp_primitive_SEND+0x2f/0x40 [sctp]\n sctp_sendmsg_to_asoc+0x3fa/0x5c0 [sctp]\n sctp_sendmsg+0x3d5/0x440 [sctp]\n sock_sendmsg+0x5b/0x70\n\nand in sctp_sched_fcfs_dequeue() it dequeued a chunk from stream\nout_curr outq while this outq was empty.\n\nNormally stream->out_curr must be set to NULL once all frag chunks of\ncurrent msg are dequeued, as we can see in sctp_sched_dequeue_done().\nHowever, in sctp_prsctp_prune_unsent() as it is not a proper dequeue,\nsctp_sched_dequeue_done() is not called to do this.\n\nThis patch is to fix it by simply setting out_curr to NULL when the\nlast frag chunk of current msg is dequeued from out_curr stream in\nsctp_prsctp_prune_unsent()."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: borrar out_curr si se eliminan todos los fragmentos del mensaje actual. Zhen Chen informó de un fallo: corrupción de list_del, ffffa035ddf01c18->next es NULL ADVERTENCIA: CPU: 1 PID: 250682 en lib/list_debug.c:49 __list_del_entry_valid+0x59/0xe0 RIP: 0010:__list_del_entry_valid+0x59/0xe0 Rastreo de llamadas: 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 y en sctp_sched_fcfs_dequeue() quitó de la cola un fragmento del flujo out_curr outq mientras este outq estaba vacío. Normalmente, stream->out_curr debe establecerse en NULL una vez que se hayan desencolado todos los fragmentos del mensaje actual, como se puede ver en sctp_sched_dequeue_done(). Sin embargo, en sctp_prsctp_prune_unsent(), dado que no es una desencola adecuada, no se llama a sctp_sched_dequeue_done() para realizar esto. Este parche soluciona este problema simplemente estableciendo out_curr en NULL cuando se desencola el último fragmento del mensaje actual del flujo out_curr en sctp_prsctp_prune_unsent()."
}
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