CVE-2021-47012

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-02-28. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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:

RDMA/siw: Fix a use after free in siw_alloc_mr

Our code analyzer reported a UAF.

In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a freed object. After, the execution continue up to the err_out branch of siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).

My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {} section, to avoid the uaf.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

February 28, 2024

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

RDMA/siw: Fix a use after free in siw_alloc_mr - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155
generic

RDMA/siw: Fix a use after free in siw_alloc_mr - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c
generic

RDMA/siw: Fix a use after free in siw_alloc_mr - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4
generic

RDMA/siw: Fix a use after free in siw_alloc_mr - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4
generic

RDMA/siw: Fix a use after free in siw_alloc_mr - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.38-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.38-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.38-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.38-1—

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 165 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
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  18. 2026-09-07 05:48 UTCOSV refresh
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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
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  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
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  22. 2026-08-06 13:44 UTCEPSS rescore
  23. 2026-08-05 19:15 UTCEPSS rescore
  24. 2026-08-05 09:44 UTCEG score recompute
  25. 2026-08-05 09:44 UTCGHSA enrichment
  26. 2026-08-04 15:06 UTCEPSS rescore
  27. 2026-08-04 12:21 UTCEG score recompute
  28. 2026-08-04 12:21 UTCGHSA enrichment
  29. 2026-08-04 10:34 UTCEPSS rescore
  30. 2026-08-04 09:54 UTCEG score recompute
  31. 2026-08-04 09:54 UTCGHSA enrichment
  32. 2026-08-03 10:33 UTCEPSS rescore
  33. 2026-08-01 11:36 UTCOSV refresh
  34. 2026-08-01 04:13 UTCEPSS rescore
  35. 2026-07-30 16:25 UTCEPSS rescore
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  42. 2026-07-23 14:16 UTCEPSS rescore
  43. 2026-07-23 02:06 UTCEG score recompute
  44. 2026-07-22 22:52 UTCEG score recompute
  45. 2026-07-22 14:06 UTCEPSS rescore
  46. 2026-07-20 17:05 UTCEPSS rescore
  47. 2026-07-19 14:29 UTCEPSS rescore
  48. 2026-07-19 02:27 UTCEPSS rescore
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  50. 2026-07-18 10:02 UTCEPSS rescore
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  56. 2026-07-14 18:25 UTCOSV refresh
  57. 2026-07-13 22:27 UTCEPSS rescore
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  66. 2026-07-07 13:43 UTCEPSS rescore
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  75. 2026-07-01 15:04 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47012?
CVE-2021-47012 is a high vulnerability published on February 28, 2024. In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix a use after free in siwallocmr Our code analyzer reported a UAF. In siwallocmr(), it calls siwmradd_mem(mr,..). In the implementation of siwmradd_mem(), mem is assigned to mr->mem and then mem is freed via kfree(mem)…
When was CVE-2021-47012 disclosed?
CVE-2021-47012 was first published in the National Vulnerability Database on February 28, 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-2021-47012 actively exploited?
CVE-2021-47012 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 83.2% of all scored CVEs.
What is the CVSS score of CVE-2021-47012?
CVE-2021-47012 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47012?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47012, 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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