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NVD / CVE Program· CNA Linux

CVE-2022-49601: tcp/dccp: Fix a data-race around sysctl_tcp_fwmark_accept.

Noroxi assessment

Priority: Monitor (action score 18/100)

  • 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: 0.18% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 13207f9485b5de68decf296ceb0046f5eabb2485, 1a0008f9df59451d0a17806c1ee1a19857032fa8, 45fc82706a97242539d6b841ddd7a077ec20757b.

Low priority for now. Upgrade to Linux Linux 13207f9485b5de68decf296ceb0046f5eabb2485, 1a0008f9df59451d0a17806c1ee1a19857032fa8, 45fc82706a97242539d6b841ddd7a077ec20757b 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: tcp/dccp: Fix a data-race around sysctl_tcp_fwmark_accept. While reading sysctl_tcp_fwmark_accept, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2022-49601

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel3.16 and later · before 4.9.325
  • linux linux kernel4.10 and later · before 4.14.290
  • linux linux kernel4.15 and later · before 4.19.254
  • linux linux kernel4.20 and later · before 5.4.208
  • linux linux kernel5.5 and later · before 5.10.134
  • linux linux kernel5.11 and later · before 5.15.58
  • linux linux kernel5.16 and later · before 5.18.15
  • linux linux kernel5.19

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

    • 3.16affected
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before 13207f9485b5de68decf296ceb0046f5eabb2485affected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before 45fc82706a97242539d6b841ddd7a077ec20757baffected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before abf70de2ec026ae8d7da4e79bec61888a880e00baffected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before a7386602a2fe2f6192477e8ede291a815da09d81affected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before d4f65615db7fca3df9f7e79eadf937e6ddb03c54affected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before bf3134feffe61b7a0e21f60a04743f8da0958b53affected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before 526d8cf8824f613c72dba2155542295e70135f62affected · git
    • 84f39b08d7868ce10eeaf640627cb89777f0ae93 and later · before 1a0008f9df59451d0a17806c1ee1a19857032fa8affected · git
    • before 3.16not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.16-15.18.16-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49599Feb 26, 2025 · tcp: Fix data-races around sysctl_tcp_l3mdev_accept.
    18Monitor
  • ← EarlierCVE-2022-49600Feb 26, 2025 · ip: Fix a data-race around sysctl_ip_autobind_reuse.
    18Monitor
  • Later →CVE-2022-49602Feb 26, 2025 · ip: Fix a data-race around sysctl_fwmark_reflect.
    18Monitor

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 Linux13207f9485b5de68decf296ceb0046f5eabb2485Vendor (CNA)
Linux Linux1a0008f9df59451d0a17806c1ee1a19857032fa8Vendor (CNA)
Linux Linux45fc82706a97242539d6b841ddd7a077ec20757bVendor (CNA)
Linux Linux526d8cf8824f613c72dba2155542295e70135f62Vendor (CNA)
Linux Linuxa7386602a2fe2f6192477e8ede291a815da09d81Vendor (CNA)
Linux Linuxabf70de2ec026ae8d7da4e79bec61888a880e00bVendor (CNA)
Linux Linuxbf3134feffe61b7a0e21f60a04743f8da0958b53Vendor (CNA)
Linux Linuxd4f65615db7fca3df9f7e79eadf937e6ddb03c54Vendor (CNA)
debian:linux5.18.16-1 · 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

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records