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CVE-2022-50865· NVD / CVE Program· CNA Linux

tcp: fix a signed-integer-overflow bug in tcp_add_backlog()

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.52% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 28addf029417d53b1df062b4c87feb7bc033cb5f, 4f23cb2be530785db284a685d1b1c30224d8a538, 9d04b4d0feee12bce6bfe37f30d8e953d3c30368.

Low priority for now. Upgrade to Linux Linux 28addf029417d53b1df062b4c87feb7bc033cb5f, 4f23cb2be530785db284a685d1b1c30224d8a538, 9d04b4d0feee12bce6bfe37f30d8e953d3c30368 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 a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value of int and overflow. This patch reduces the limit budget by halving the sndbuf to solve this issue since ACK packets are much smaller than the payload.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Dec 30, 2025
Updated
Aug 5, 2026
EPSS
0.5% · 43th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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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.

—

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

    • 4.9affected
    • c9c3321257e1b95be9b375f811fb250162af8d39 and later · before 9d04b4d0feee12bce6bfe37f30d8e953d3c30368affected · git
    • c9c3321257e1b95be9b375f811fb250162af8d39 and later · before 4f23cb2be530785db284a685d1b1c30224d8a538affected · git
    • c9c3321257e1b95be9b375f811fb250162af8d39 and later · before a85d39f14aa8a71e29cfb5eb5de02878a8779898affected · git
    • c9c3321257e1b95be9b375f811fb250162af8d39 and later · before 28addf029417d53b1df062b4c87feb7bc033cb5faffected · git
    • c9c3321257e1b95be9b375f811fb250162af8d39 and later · before ec791d8149ff60c40ad2074af3b92a39c916a03faffected · git
    • before 4.9not affected · semver
    • 5.4.278 and later · up to and including 5.4.*not affected · semver
    • 5.10.153 and later · up to and including 5.10.*not affected · semver
    • 5.15.77 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.100.1.el8_104.18.0-553.100.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.100.1.rt7.441.el8_104.18.0-553.100.1.rt7.441.el8_10

+96

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
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  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan
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    40Plan

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 Linux28addf029417d53b1df062b4c87feb7bc033cb5fVendor (CNA)
Linux Linux4f23cb2be530785db284a685d1b1c30224d8a538Vendor (CNA)
Linux Linux9d04b4d0feee12bce6bfe37f30d8e953d3c30368Vendor (CNA)
Linux Linuxa85d39f14aa8a71e29cfb5eb5de02878a8779898Vendor (CNA)
Linux Linuxec791d8149ff60c40ad2074af3b92a39c916a03fVendor (CNA)
almalinux:bpftool4.18.0-553.100.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.100.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.0.7-1 · Debian:12Package registry (OSV)
red hat:kernel-rt0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-devel0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-kvm0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-modules0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-modules-extra0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)

+2

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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✗ → ✓

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

References

Show all references (4 more)

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

All records