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NVD / CVE Program· CNA Linux

CVE-2022-49586: tcp: Fix data-races around sysctl_tcp_fastopen.

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 03da610696a32578fc4f986479341ce9d430df08, 22938534c611136f35e2ca545bb668073ca5ef49, 25d53d858a6c0b89a6e69e376c2a57c4f4c2c8cc.

Low priority for now. Upgrade to Linux Linux 03da610696a32578fc4f986479341ce9d430df08, 22938534c611136f35e2ca545bb668073ca5ef49, 25d53d858a6c0b89a6e69e376c2a57c4f4c2c8cc 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: Fix data-races around sysctl_tcp_fastopen. While reading sysctl_tcp_fastopen, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers.

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-2022-49586

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 kernel3.6 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

    • 3.6affected
    • 2100c8d2d9db23c0a09901a782bb4e3b21bee298 and later · before 03da610696a32578fc4f986479341ce9d430df08affected · git
    • 2100c8d2d9db23c0a09901a782bb4e3b21bee298 and later · before 25d53d858a6c0b89a6e69e376c2a57c4f4c2c8ccaffected · git
    • 2100c8d2d9db23c0a09901a782bb4e3b21bee298 and later · before 22938534c611136f35e2ca545bb668073ca5ef49affected · git
    • 2100c8d2d9db23c0a09901a782bb4e3b21bee298 and later · before 539d9ab79eba3974b479cad61a8688c41fe62e12affected · git
    • 2100c8d2d9db23c0a09901a782bb4e3b21bee298 and later · before 448ab998947996a0a451f8229f19087964cf2670affected · git
    • 2100c8d2d9db23c0a09901a782bb4e3b21bee298 and later · before 5a54213318c43f4009ae158347aa6016e3b9b55aaffected · git
    • before 3.6not affected · semver
    • 4.19.254 and later · up to and including 4.19.*not affected · semver
    • 5.4.208 and later · up to and including 5.4.*not 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-2022-49584Feb 26, 2025 · ixgbe: Add locking to prevent panic when setting sriov_numvfs to zero
    22Monitor
  • ← EarlierCVE-2022-49585Feb 26, 2025 · tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout.
    18Monitor
  • Later →CVE-2022-49587Feb 26, 2025 · tcp: Fix a data-race around sysctl_tcp_notsent_lowat.
    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 Linux03da610696a32578fc4f986479341ce9d430df08Vendor (CNA)
Linux Linux22938534c611136f35e2ca545bb668073ca5ef49Vendor (CNA)
Linux Linux25d53d858a6c0b89a6e69e376c2a57c4f4c2c8ccVendor (CNA)
Linux Linux448ab998947996a0a451f8229f19087964cf2670Vendor (CNA)
Linux Linux539d9ab79eba3974b479cad61a8688c41fe62e12Vendor (CNA)
Linux Linux5a54213318c43f4009ae158347aa6016e3b9b55aVendor (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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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 (5 more)

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

All records