# CVE-2022-49838: linux: In the Linux kernel, the following vulnerability has been resolved:  sctp: clear out_curr if all frag chunks of curre...

CVE-2022-49838 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49838, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49838
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## 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().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49838](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49838.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49838](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49838.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49838](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49838.md) | May 1, 2025 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.