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CVE-2022-49630

tcp: Fix a data-race around sysctl_tcp_ecn_fallback.

MEDIUM
4.7
CVSS Score
Published: February 26, 2025 at 02:23 AM UTC
Updated: June 17, 2026 at 05:18 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix a data-race around sysctl_tcp_ecn_fallback. While reading sysctl_tcp_ecn_fallback, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
4.2 ≤ v < 5.15.564.2 ≤ v < 5.18.134.2 ≤ v < 5.195.16 ≤ v < 5.18.13492135557dc090a1abb2cfbe1a412757e3ed68ab5.19 rc15.19 rc25.19 rc35.19 rc45.19 rc55.19 rc6
Vendor states this is fixed in 12b8d9ca7e678abc48195294494f1815b555d658 (fixed)
Vendor states this is fixed in 1ec3d6c2626ee6e1b36b7bd006873a271406ba61 (fixed)
Vendor states this is fixed in 8bcf7339f2cf70ea4461df6ea045d1aadfabfa11 (fixed)
Vendor states this is fixed in 4.2 (unaffected)
Vendor states this is fixed in 5.15.56 (unaffected)
Vendor states this is fixed in 5.18.13 (unaffected)
Vendor states this is fixed in 5.19 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/12b8d9ca7e678abc48195294494f1815b555d658
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1ec3d6c2626ee6e1b36b7bd006873a271406ba61
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/8bcf7339f2cf70ea4461df6ea045d1aadfabfa11

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-362

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