CVE-2021-47240

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2024-05-21. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

net: qrtr: fix OOB Read in qrtr_endpoint_post

Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type:

if (len != ALIGN(size, 4) + hdrlen) goto err;

If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and

skb_put_data(skb, data + hdrlen, size);

will read out of bound from data, which is hdrlen allocated block.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

May 21, 2024

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

net: qrtr: fix OOB Read in qrtr_endpoint_post - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ad9d24c9429e2159d1e279dc3a83191ccb4daf1d
generic

net: qrtr: fix OOB Read in qrtr_endpoint_post - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe
generic

net: qrtr: fix OOB Read in qrtr_endpoint_post - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/960b08dd36de1e341e3eb43d1c547513e338f4f8
generic

net: qrtr: fix OOB Read in qrtr_endpoint_post - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/26b8d10703a9be45d6097946b2b4011f7dd2c56f
generic

net: qrtr: fix OOB Read in qrtr_endpoint_post - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f8111c0d7ed42ede41a3d0d393b104de0730a8a6

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-09-24 14:00 UTCEPSS rescore
  2. 2026-09-24 14:00 UTCEPSS rescore
  3. 2026-09-23 13:45 UTCEPSS rescore
  4. 2026-09-22 14:44 UTCEPSS rescore
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  16. 2026-09-08 21:57 UTCEPSS rescore
  17. 2026-09-07 15:58 UTCEPSS rescore
  18. 2026-09-07 05:47 UTCOSV refresh
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  25. 2026-08-30 19:14 UTCEPSS rescore
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  1. 2026-08-30 01:19 UTCEPSS rescore
  2. 2026-08-28 21:38 UTCEPSS rescore
  3. 2026-08-27 14:22 UTCEPSS rescore
  4. 2026-08-26 14:43 UTCEPSS rescore
  5. 2026-08-25 13:46 UTCEPSS rescore
  6. 2026-08-24 14:13 UTCEPSS rescore
  7. 2026-08-21 23:46 UTCEPSS rescore
  8. 2026-08-20 22:52 UTCEPSS rescore
  9. 2026-08-20 15:31 UTCOSV refresh
  10. 2026-08-19 17:01 UTCEPSS rescore
  11. 2026-08-18 13:45 UTCEPSS rescore
  12. 2026-08-17 13:44 UTCEPSS rescore
  13. 2026-08-16 14:53 UTCEPSS rescore
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  22. 2026-08-06 13:44 UTCEPSS rescore
  23. 2026-08-05 19:15 UTCEPSS rescore
  24. 2026-08-05 09:42 UTCEG score recompute
  25. 2026-08-05 09:41 UTCGHSA enrichment
  26. 2026-08-04 15:06 UTCEPSS rescore
  27. 2026-08-04 12:13 UTCEG score recompute
  28. 2026-08-04 12:13 UTCGHSA enrichment
  29. 2026-08-04 10:34 UTCEPSS rescore
  30. 2026-08-04 09:52 UTCEG score recompute
  31. 2026-08-04 09:52 UTCGHSA enrichment
  32. 2026-08-03 10:33 UTCEPSS rescore
  33. 2026-08-02 02:24 UTCEPSS rescore
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  35. 2026-08-01 03:12 UTCOSV refresh
  36. 2026-07-30 16:25 UTCEPSS rescore
  37. 2026-07-30 01:28 UTCEPSS rescore
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  39. 2026-07-26 14:52 UTCEPSS rescore
  40. 2026-07-25 14:15 UTCEPSS rescore
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  42. 2026-07-24 14:15 UTCEPSS rescore
  43. 2026-07-23 14:16 UTCEPSS rescore
  44. 2026-07-23 02:06 UTCEG score recompute
  45. 2026-07-22 22:53 UTCEG score recompute
  46. 2026-07-22 14:06 UTCEPSS rescore
  47. 2026-07-21 15:22 UTCEPSS rescore
  48. 2026-07-21 15:22 UTCEPSS rescore
  49. 2026-07-20 17:05 UTCEPSS rescore
  50. 2026-07-19 14:29 UTCEPSS rescore
  51. 2026-07-19 02:27 UTCEPSS rescore
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  53. 2026-07-18 10:02 UTCEPSS rescore
  54. 2026-07-16 17:00 UTCEPSS rescore
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  56. 2026-07-15 16:55 UTCEPSS rescore
  57. 2026-07-15 01:58 UTCEPSS rescore
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  59. 2026-07-14 10:10 UTCOSV refresh
  60. 2026-07-13 22:27 UTCEPSS rescore
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  63. 2026-07-12 05:44 UTCEPSS rescore
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  65. 2026-07-09 19:07 UTCEPSS rescore
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  67. 2026-07-08 15:12 UTCEPSS rescore
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  69. 2026-07-07 13:43 UTCEPSS rescore
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  72. 2026-07-06 02:21 UTCEPSS rescore
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  74. 2026-07-05 02:28 UTCEPSS rescore
  75. 2026-07-05 02:28 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47240?
CVE-2021-47240 is a high vulnerability published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix OOB Read in qrtrendpointpost Syzbot reported slab-out-of-bounds Read in qrtrendpointpost. The problem was in wrong size type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293…
When was CVE-2021-47240 disclosed?
CVE-2021-47240 was first published in the National Vulnerability Database on May 21, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47240 actively exploited?
CVE-2021-47240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.7% of all scored CVEs.
What is the CVSS score of CVE-2021-47240?
CVE-2021-47240 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2021-47240?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47240, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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