CVE-2022-50865

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2025-12-30. The CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory

Also known asEUVD-2022-55833 (ENISA EUVD) · GHSA-2qmc-x97c-8pmc (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
45th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 30, 2025

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Aug 5, 2026
Patch available.
Web page

tcp: fix a signed-integer-overflow bug in tcp_add_backlog() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ec791d8149ff60c40ad2074af3b92a39c916a03f
Web page

tcp: fix a signed-integer-overflow bug in tcp_add_backlog() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/28addf029417d53b1df062b4c87feb7bc033cb5f
Web page

tcp: fix a signed-integer-overflow bug in tcp_add_backlog() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a85d39f14aa8a71e29cfb5eb5de02878a8779898
Web page

tcp: fix a signed-integer-overflow bug in tcp_add_backlog() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4f23cb2be530785db284a685d1b1c30224d8a538
Web page

tcp: fix a signed-integer-overflow bug in tcp_add_backlog() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9d04b4d0feee12bce6bfe37f30d8e953d3c30368

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:4.18.0-193.187.1.el8_22026-02-26redhat
redhatkernel-0:4.18.0-305.186.1.el8_42026-02-25redhat
redhatkernel-0:4.18.0-477.130.1.el8_82026-02-25redhat
redhatkernel-rt-0:5.14.0-70.165.1.rt21.237.el9_02026-02-11redhat
redhatkernel-0:4.18.0-372.179.1.el8_62026-02-11redhat
redhatkernel-0:5.14.0-70.165.1.el9_02026-02-11redhat
redhatkernel-0:5.14.0-284.155.1.el9_22026-02-04redhat
redhatkernel-rt-0:5.14.0-284.155.1.rt14.440.el9_22026-02-04redhat
redhatkernel-0:4.18.0-553.100.1.el8_102026-02-02redhat
redhatkernel-rt-0:4.18.0-553.100.1.rt7.441.el8_102026-02-02redhat
redhatkernel-0:5.14.0-362.8.1.el9_32023-11-07redhat
linuxKernel @ 5.4.278 (fixes >=4.9.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (22 versions)
  • every version up to 5.10.158-1: fixed in 5.10.158-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.0.7-1: fixed in 6.0.7-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.0.7-1: fixed in 6.0.7-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.0.7-1: fixed in 6.0.7-1
—

Data Freshness Timeline

(refreshed 9× in last 7d / 38× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 280 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 180 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:43 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  2. 2026-11-12 16:30 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  3. 2026-11-12 07:39 UTCEchelonGraph re-scored
  4. 2026-11-12 07:39 UTCVendor advisory
  5. 2026-11-12 07:39 UTCGHSA enrichmentGHSA-2qmc-x97c-8pmc · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-11-11 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  7. 2026-11-10 16:36 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  8. 2026-11-09 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-11-08 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-11-07 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-11-06 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-11-05 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-11-05 01:45 UTCEchelonGraph re-scored
  14. 2026-11-05 01:45 UTCVendor advisory
  15. 2026-11-05 01:45 UTCGHSA enrichmentGHSA-2qmc-x97c-8pmc · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-11-04 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-11-03 16:40 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-11-02 16:39 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  19. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  22. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  23. 2026-10-28 19:50 UTCEchelonGraph re-scored
  24. 2026-10-28 19:50 UTCVendor advisory
  25. 2026-10-28 19:50 UTCGHSA enrichmentGHSA-2qmc-x97c-8pmc · GitHub severity HIGH · GitHub CVSS 7.5
Show 75 more
  1. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-27 16:28 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-25 17:53 UTCEchelonGraph re-scored
  5. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-22 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-21 05:28 UTCEchelonGraph re-scored
  11. 2026-10-21 05:28 UTCVendor advisory
  12. 2026-10-21 05:28 UTCGHSA enrichmentGHSA-2qmc-x97c-8pmc · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-20 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-19 16:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-18 08:18 UTCEchelonGraph re-scored
  17. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-16 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-13 16:29 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-12 18:40 UTCEchelonGraph re-scored
  23. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-11 22:04 UTCEchelonGraph re-scored
  25. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  26. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  27. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  28. 2026-10-09 14:58 UTCOSV refresh
  29. 2026-10-08 17:05 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  30. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  31. 2026-10-06 15:14 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  32. 2026-10-05 17:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  33. 2026-10-04 23:19 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  34. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  35. 2026-09-30 16:13 UTCEchelonGraph re-scored
  36. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  37. 2026-09-27 13:42 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  38. 2026-09-26 15:55 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  39. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  40. 2026-09-24 14:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  41. 2026-09-23 13:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  42. 2026-09-20 20:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  43. 2026-09-19 22:20 UTCOSV refresh
  44. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  45. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  46. 2026-09-15 03:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  47. 2026-09-13 16:44 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  48. 2026-09-11 14:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  49. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  50. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  51. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  52. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  53. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  54. 2026-09-04 13:57 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  55. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  56. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  57. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  58. 2026-09-01 01:34 UTCOSV refresh
  59. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  60. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  61. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  62. 2026-08-27 14:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  63. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  64. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  65. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  66. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  67. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  68. 2026-08-19 17:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  69. 2026-08-18 13:45 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  70. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  71. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  72. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  73. 2026-08-15 01:27 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  74. 2026-08-15 01:22 UTCEchelonGraph re-scored
  75. 2026-08-15 01:22 UTCVendor advisory

Frequently asked(5)

What is CVE-2022-50865?
CVE-2022-50865 is a high-severity vulnerability; its CVE record was published on December 30, 2025. 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…
When was the CVE record for CVE-2022-50865 published?
The CVE record for CVE-2022-50865 was published on December 30, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 5, 2026; the record at its source may have been updated since.
Is CVE-2022-50865 actively exploited?
CVE-2022-50865 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-50865?
CVE-2022-50865 has a CVSS base score of 7.5 (the CNA's own assessment, by linux; NVD's own analysis pending).
How do I remediate CVE-2022-50865?
A fix for CVE-2022-50865 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-50865 are linked in the Vendor Advisories panel on this page.

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