CVE-2024-56681

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

Score 5.5 from GitHub Security Advisory (severity: MODERATE) published 2024-12-28. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2024-53329 (ENISA EUVD) · GHSA-c5v3-r759-x9gj (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

crypto: bcm - add error check in the ahash_hmac_init function

The ahash_init functions may return fails. The ahash_hmac_init should not return ok when ahash_init returns error. For an example, ahash_init will return -ENOMEM when allocation memory is error.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.2%
EPSS %ILE
15th
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-07). 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 low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 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 low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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 28, 2024

Last Modified

October 15, 2026

Advisory Details (9)

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

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/19630cf57233e845b6ac57c9c969a4888925467b
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bba9e38c5ad41d0a88b22a59e5b6dd3e31825118
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ee36db8e8203420e6d5c42eb9428920c2fc36532
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ae5253313e0ea5f00c06176074592b7f493c8546
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/05f0a3f5477ecaa1cf46448504afe9e7c2e96fcc
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4ea3e3b761e371102bb1486778e2f8dbc9e37413
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/28f8ffa945f7d7150463e15097ea73b19529d6f5
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75e1e38e5d80d6d9011b7322698ffba3dd3db30a
Web page

crypto: bcm - add error check in the ahash_hmac_init function - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8f1a9a960b1107bd0e0ec3736055f5ed0e717edf

Patch Availability(31)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-realtime-hwe-24.04-edge (6.11.0-1005.5) @ oracular2026-10-15ubuntu
ubuntulinux-tools-oem-24.04b (6.11.0-1015.15) @ noble2026-10-15ubuntu
ubuntulinux-tools-kvm (5.15.0.1076.72) @ jammy2026-10-15ubuntu
ubuntulinux-tools-aws-fips (5.4.0.1142.89) @ focal2026-10-15ubuntu
ubuntulinux-tools-realtime (5.15.0.1080.83) @ jammy2026-10-15ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1027.29~22.04.1) @ jammy2026-10-15ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1074.77~20.04.1) @ focal2026-10-15ubuntu
ubuntulinux-tools-ibm-edge (5.4.0.1090.95~18.04.1) @ bionic2026-10-15ubuntu
ubuntulinux-tools-intel-iotg-edge (5.15.0.1077.83~20.04.1) @ focal2026-10-15ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.11.0-18.18) @ oracular2026-10-15ubuntu
ubuntulinux-tools-gcp-fips (5.15.0.1079.69) @ jammy2026-10-15ubuntu
ubuntulinux-xilinx-zynqmp-tools-host (5.15.0-1044.48) @ jammy2026-10-15ubuntu
ubuntulinux-virtual-hwe-18.04-edge (5.4.0.211.206) @ focal2026-10-15ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.135.133) @ jammy2026-10-15ubuntu
ubuntulinux-tools-nvidia-tegra-rt (5.15.0.1033.33) @ jammy2026-10-15ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1060 (5.4.0-1060.64) @ focal2026-10-15ubuntu
ubuntulinux-tools-gcp-fips (5.4.0.1145.87) @ focal2026-10-15ubuntu
ubuntulinux-tools-fips (5.4.0.1116.113) @ focal2026-10-15ubuntu
ubuntulinux-tools-aws-lts-20.04 (5.4.0.1142.139) @ focal2026-10-15ubuntu
ubuntulinux-tools-aws-edge (5.4.0.1142.152~18.04.1) @ bionic2026-10-15ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.136.147~20.04.1) @ focal2026-10-15ubuntu
ubuntulinux-tools-iot (5.4.0.1048.46) @ focal2026-10-15ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1086.95~20.04.1.61) @ focal2026-10-15ubuntu
ubuntulinux-tools-gcp-edge (6.8.0-1028.30~22.04.1) @ jammy2026-10-15ubuntu
ubuntulinux-virtual (6.8.0-58.60) @ noble2026-10-15ubuntu
ubuntulinux-tools-raspi-hwe-18.04-edge (5.4.0.1129.142~18.04.1) @ bionic2026-10-15ubuntu
ubuntulinux-tools-gkeop-6.8 (6.8.0-1010.12) @ noble2026-10-15ubuntu
ubuntulinux-tools-realtime-hwe-24.04 (6.8.1-1020.21) @ noble2026-10-15ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-58.60~22.04.1) @ jammy2026-10-15ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1081.90~20.04.1) @ focal2026-10-15ubuntu
linuxKernel @ 4.19.325 (fixes >=4.11.0)—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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (44 versions)
  • every version up to 5.10.234-1: fixed in 5.10.234-1
—
linux-6.16.1.106-3~deb11u1, 6.1.106-3~deb11u2, 6.1.106-3~deb11u3, 6.1.112-1~deb11u1, 6.1.119-1~deb11u1
  • every version up to 6.1.128-1~deb11u1: fixed in 6.1.128-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (32 versions)
  • every version up to 6.1.123-1: fixed in 6.1.123-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.12.3-1: fixed in 6.12.3-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.12.3-1: fixed in 6.12.3-1
—

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 41× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 95 of 221 refreshes 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 126 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-09 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  2. 2026-11-08 16:36 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  3. 2026-11-07 20:43 UTCGHSA enrichmentGHSA-c5v3-r759-x9gj · GitHub severity MODERATE · GitHub CVSS 5.5
  4. 2026-11-07 20:43 UTCEG score recompute
  5. 2026-11-07 16:36 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  6. 2026-11-06 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  7. 2026-11-05 16:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  8. 2026-11-04 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  9. 2026-11-03 16:43 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  10. 2026-11-02 16:41 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  11. 2026-11-01 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  12. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  13. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  14. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  15. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  16. 2026-10-27 19:55 UTCOSV refresh
  17. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  18. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  19. 2026-10-25 16:55 UTCEG score recompute
  20. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  21. 2026-10-24 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-10-21 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 70 more
  1. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-18 05:58 UTCEG score recompute
  4. 2026-10-17 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  5. 2026-10-16 16:37 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  6. 2026-10-15 23:11 UTCEG score recompute
  7. 2026-10-15 23:11 UTCVendor advisory
  8. 2026-10-15 23:11 UTCGHSA enrichmentGHSA-c5v3-r759-x9gj · GitHub CVSS 5.5
  9. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-13 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-12 17:37 UTCEG score recompute
  13. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-11 21:03 UTCEG score recompute
  15. 2026-10-11 15:54 UTCEG score recompute
  16. 2026-10-11 13:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-08 17:08 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  23. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  24. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-10-02 16:25 UTCEG score recompute
  26. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  27. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  29. 2026-09-27 13:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  30. 2026-09-27 04:15 UTCOSV refresh
  31. 2026-09-26 15:57 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  32. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  33. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  34. 2026-09-22 14:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  35. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  36. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  37. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-09-16 05:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  39. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  40. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  41. 2026-09-12 14:59 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  42. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  43. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  44. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  45. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  46. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-09-07 13:18 UTCOSV refresh
  48. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  49. 2026-09-04 13:59 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  51. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  52. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  53. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  54. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  55. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  56. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  57. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  58. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-08-24 14:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  60. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  61. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  62. 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  63. 2026-08-20 22:31 UTCOSV refresh
  64. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  65. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  66. 2026-08-17 13:45 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  67. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  68. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  69. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  70. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.2% · 15th percentile

Frequently asked(5)

What is CVE-2024-56681?
CVE-2024-56681 is a medium-severity vulnerability; its CVE record was published on December 28, 2024. In the Linux kernel, the following vulnerability has been resolved: crypto: bcm - add error check in the ahash_hmac_init function The ahash_init functions may return fails. The ahash_hmac_init should not return ok when ahash_init returns error. For an example, ahash_init will return -ENOMEM when…
When was the CVE record for CVE-2024-56681 published?
The CVE record for CVE-2024-56681 was published on December 28, 2024. 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 October 15, 2026; the record at its source may have been updated since.
Is CVE-2024-56681 actively exploited?
CVE-2024-56681 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2024-56681?
CVE-2024-56681 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2024-56681?
A fix for CVE-2024-56681 is available: update to the fixed version the vendor names in its advisory.

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