CVE-2023-53986

UNRATEDCVSS · not yet scored
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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: —Exploit: 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:

mips: bmips: BCM6358: disable RAC flush for TP1

RAC flush causes kernel panics on BCM6358 with EHCI/OHCI when booting from TP1: [ 3.881739] usb 1-1: new high-speed USB device number 2 using ehci-platform [ 3.895011] Reserved instruction in kernel code[#1]: [ 3.900113] CPU: 0 PID: 1 Comm: init Not tainted 5.10.16 #0 [ 3.905829] $ 0 : 00000000 10008700 00000000 77d94060 [ 3.911238] $ 4 : 7fd1f088 00000000 81431cac 81431ca0 [ 3.916641] $ 8 : 00000000 ffffefff 8075cd34 00000000 [ 3.922043] $12 : 806f8d40 f3e812b7 00000000 000d9aaa [ 3.927446] $16 : 7fd1f068 7fd1f080 7ff559b8 81428470 [ 3.932848] $20 : 00000000 00000000 55590000 77d70000 [ 3.938251] $24 : 00000018 00000010 [ 3.943655] $28 : 81430000 81431e60 81431f28 800157fc [ 3.949058] Hi : 00000000 [ 3.952013] Lo : 00000000 [ 3.955019] epc : 80015808 setup_sigcontext+0x54/0x24c [ 3.960464] ra : 800157fc setup_sigcontext+0x48/0x24c [ 3.965913] Status: 10008703 KERNEL EXL IE [ 3.970216] Cause : 00800028 (ExcCode 0a) [ 3.974340] PrId : 0002a010 (Broadcom BMIPS4350) [ 3.979170] Modules linked in: ohci_platform ohci_hcd fsl_mph_dr_of ehci_platform ehci_fsl ehci_hcd gpio_button_hotplug usbcore nls_base usb_common [ 3.992907] Process init (pid: 1, threadinfo=(ptrval), task=(ptrval), tls=77e22ec8) [ 4.000776] Stack : 81431ef4 7fd1f080 81431f28 81428470 7fd1f068 81431edc 7ff559b8 81428470 [ 4.009467] 81431f28 7fd1f080 55590000 77d70000 77d5498c 80015c70 806f0000 8063ae74 [ 4.018149] 08100002 81431f28 0000000a 08100002 81431f28 0000000a 77d6b418 00000003 [ 4.026831] ffffffff 80016414 80080734 81431ecc 81431ecc 00000001 00000000 04000000 [ 4.035512] 77d54874 00000000 00000000 00000000 00000000 00000012 00000002 00000000 [ 4.044196] ... [ 4.046706] Call Trace: [ 4.049238] [<80015808>] setup_sigcontext+0x54/0x24c [ 4.054356] [<80015c70>] setup_frame+0xdc/0x124 [ 4.059015] [<80016414>] do_notify_resume+0x1dc/0x288 [ 4.064207] [<80011b50>] work_notifysig+0x10/0x18 [ 4.069036] [ 4.070538] Code: 8fc300b4 00001025 26240008 ac830004 3c048063 0c0228aa 24846a00 26240010 [ 4.080686] [ 4.082517] ---[ end trace 22a8edb41f5f983b ]--- [ 4.087374] Kernel panic - not syncing: Fatal exception [ 4.092753] Rebooting in 1 seconds..

Because the bootloader (CFE) is not initializing the Read-ahead cache properly on the second thread (TP1). Since the RAC was not initialized properly, we should avoid flushing it at the risk of corrupting the instruction stream as seen in the trace above.

CVSS v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

December 24, 2025

Last Modified

April 15, 2026

References (6)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.4.240—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.

Data Freshness Timeline

(refreshed 8× in last 7d / 42× 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 126 total refreshes for this CVE.

  1. 2026-08-01 04:14 UTCEPSS rescore
  2. 2026-07-30 16:26 UTCEPSS rescore
  3. 2026-07-30 01:29 UTCEPSS rescore
  4. 2026-07-28 15:34 UTCEPSS rescore
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  6. 2026-07-27 04:09 UTCOSV refresh
  7. 2026-07-26 14:53 UTCEPSS rescore
  8. 2026-07-25 14:16 UTCEPSS rescore
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  10. 2026-07-23 14:16 UTCEPSS rescore
  11. 2026-07-23 02:30 UTCEG score recompute
  12. 2026-07-22 23:16 UTCEG score recompute
  13. 2026-07-22 14:07 UTCEPSS rescore
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  15. 2026-07-21 15:23 UTCEPSS rescore
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  17. 2026-07-19 14:30 UTCEPSS rescore
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  24. 2026-07-15 16:56 UTCEPSS rescore
  25. 2026-07-15 01:59 UTCEPSS rescore
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  1. 2026-07-15 01:59 UTCEPSS rescore
  2. 2026-07-13 22:28 UTCEPSS rescore
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  4. 2026-07-12 05:45 UTCEPSS rescore
  5. 2026-07-12 05:45 UTCEPSS rescore
  6. 2026-07-11 08:26 UTCEPSS rescore
  7. 2026-07-09 22:45 UTCOSV refresh
  8. 2026-07-09 19:08 UTCEPSS rescore
  9. 2026-07-08 15:13 UTCEPSS rescore
  10. 2026-07-07 13:45 UTCEPSS rescore
  11. 2026-07-07 13:44 UTCEPSS rescore
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  18. 2026-07-01 15:05 UTCEPSS rescore
  19. 2026-06-30 23:21 UTCEPSS rescore
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  21. 2026-06-29 14:05 UTCEPSS rescore
  22. 2026-06-28 14:06 UTCEPSS rescore
  23. 2026-06-28 14:06 UTCEPSS rescore
  24. 2026-06-28 04:55 UTCEPSS rescore
  25. 2026-06-27 03:07 UTCEPSS rescore
  26. 2026-06-25 13:48 UTCEPSS rescore
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  28. 2026-06-24 14:04 UTCEPSS rescore
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  30. 2026-06-23 21:31 UTCEPSS rescore
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  34. 2026-06-21 14:55 UTCEPSS rescore
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  36. 2026-06-21 08:31 UTCOSV refresh
  37. 2026-06-21 01:58 UTCEPSS rescore
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  39. 2026-06-19 19:24 UTCEPSS rescore
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  41. 2026-06-18 17:51 UTCEPSS rescore
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  45. 2026-06-15 17:47 UTCEPSS rescore
  46. 2026-06-14 23:16 UTCEPSS rescore
  47. 2026-06-13 22:59 UTCEPSS rescore
  48. 2026-06-13 22:59 UTCEPSS rescore
  49. 2026-06-12 23:11 UTCEPSS rescore
  50. 2026-06-11 13:59 UTCEPSS rescore
  51. 2026-06-10 22:17 UTCEPSS rescore
  52. 2026-06-10 13:21 UTCEPSS rescore
  53. 2026-06-08 14:16 UTCEPSS rescore
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  55. 2026-06-07 15:24 UTCEPSS rescore
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  57. 2026-06-06 13:46 UTCEPSS rescore
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  63. 2026-06-04 13:11 UTCEPSS rescore
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  65. 2026-06-02 20:12 UTCEPSS rescore
  66. 2026-06-02 20:12 UTCEPSS rescore
  67. 2026-06-01 22:52 UTCOSV refresh
  68. 2026-06-01 13:51 UTCEPSS rescore
  69. 2026-05-31 22:30 UTCEPSS rescore
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  73. 2026-05-29 13:43 UTCEPSS rescore
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  75. 2026-05-28 13:44 UTCEPSS rescore

Frequently asked(4)

What is CVE-2023-53986?
CVE-2023-53986 is a publicly disclosed vulnerability published on December 24, 2025. In the Linux kernel, the following vulnerability has been resolved: mips: bmips: BCM6358: disable RAC flush for TP1 RAC flush causes kernel panics on BCM6358 with EHCI/OHCI when booting from TP1: [ 3.881739] usb 1-1: new high-speed USB device number 2 using ehci-platform [ 3.895011] Reserved…
When was CVE-2023-53986 disclosed?
CVE-2023-53986 was first published in the National Vulnerability Database on December 24, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-53986 actively exploited?
CVE-2023-53986 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 92.2% of all scored CVEs.
How do I remediate CVE-2023-53986?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-53986, 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.

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