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NVD / CVE Program· CNA Linux

CVE-2022-50655: ppp: associate skb with a device at tx

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 148dcbd3af039ae39c3af697a3183008c7995805, 18dc946360bfe0de016a59e3cc3ee1f450fceb9d, 4b8f3b939266c90f03b7cc7e26a4c28c7b64137b.

Low priority for now. Upgrade to Linux Linux 148dcbd3af039ae39c3af697a3183008c7995805, 18dc946360bfe0de016a59e3cc3ee1f450fceb9d, 4b8f3b939266c90f03b7cc7e26a4c28c7b64137b or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Dec 8, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.20affected
    • d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 and later · before 7da524781c531ebaf2f94c9dc4c541b82edecfedaffected · git
    • d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 and later · before 148dcbd3af039ae39c3af697a3183008c7995805affected · git
    • d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 and later · before 4b8f3b939266c90f03b7cc7e26a4c28c7b64137baffected · git
    • d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 and later · before 18dc946360bfe0de016a59e3cc3ee1f450fceb9daffected · git
    • d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 and later · before ee678b1f52f9439e930db2db3fd7e345d03e1a50affected · git
    • d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 and later · before 9f225444467b98579cf28d94f4ad053460dfdb84affected · git
    • before 4.20not affected · semver
    • 5.4.229 and later · up to and including 5.4.*not affected · semver
    • 5.10.163 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-50653Dec 8, 2025 · mmc: atmel-mci: fix return value check of mmc_add_host()
    0Monitor
  • ← EarlierCVE-2022-50654Dec 8, 2025 · bpf: Fix panic due to wrong pageattr of im->image
    0Monitor
  • Later →CVE-2022-50656Dec 8, 2025 · nfc: pn533: Clear nfc_target before being used
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux148dcbd3af039ae39c3af697a3183008c7995805Vendor (CNA)
Linux Linux18dc946360bfe0de016a59e3cc3ee1f450fceb9dVendor (CNA)
Linux Linux4b8f3b939266c90f03b7cc7e26a4c28c7b64137bVendor (CNA)
Linux Linux7da524781c531ebaf2f94c9dc4c541b82edecfedVendor (CNA)
Linux Linux9f225444467b98579cf28d94f4ad053460dfdb84Vendor (CNA)
Linux Linuxee678b1f52f9439e930db2db3fd7e345d03e1a50Vendor (CNA)
debian:linux6.1.4-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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