# CVE-2022-50655: linux: In the Linux kernel, the following vulnerability has been resolved:  ppp: associate skb with a device at tx  Syzkalle...

CVE-2022-50655 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50655, released December 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50655
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 9, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  ppp: associate skb with a device at tx  Syzkaller triggered flow dissector warning with the following:  r0 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000000), 0xc0802, 0x0) ioctl$PPPIOCNEWUNIT(r0, 0xc004743e, &(0x7f00000000c0)) ioctl$PPPIOCSACTIVE(r0, 0x40107446, &(0x7f0000000240)={0x2, &(0x7f0000000180)=[{0x20, 0x0, 0x0, 0xfffff034}, {0x6}]}) pwritev(r0, &(0x7f0000000040)=[{&(0x7f0000000140)='\x00!', 0x2}], 0x1, 0x0, 0x0)  [    9.485814] WARNING: CPU: 3 PID: 329 at net/core/flow_dissector.c:1016 __skb_flow_dissect+0x1ee0/0x1fa0 [    9.485929]  skb_get_poff+0x53/0xa0 [    9.485937]  bpf_skb_get_pay_offset+0xe/0x20 [    9.485944]  ? ppp_send_frame+0xc2/0x5b0 [    9.485949]  ? _raw_spin_unlock_irqrestore+0x40/0x60 [    9.485958]  ? __ppp_xmit_process+0x7a/0xe0 [    9.485968]  ? ppp_xmit_process+0x5b/0xb0 [    9.485974]  ? ppp_write+0x12a/0x190 [    9.485981]  ? do_iter_write+0x18e/0x2d0 [    9.485987]  ? __import_iovec+0x30/0x130 [    9.485997]  ? do_pwritev+0x1b6/0x240 [    9.486016]  ? trace_hardirqs_on+0x47/0x50 [    9.486023]  ? __x64_sys_pwritev+0x24/0x30 [    9.486026]  ? do_syscall_64+0x3d/0x80 [    9.486031]  ? entry_SYSCALL_64_after_hwframe+0x63/0xcd  Flow dissector tries to find skb net namespace either via device or via socket. Neigher is set in ppp_send_frame, so let's manually use ppp->dev.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50655](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50655.md) | Dec 9, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50655](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50655.md) | Dec 9, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50655](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50655.md) | Dec 9, 2025 |

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