CVE-2023-53121

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-05-02. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

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

tcp: tcp_make_synack() can be called from process context

tcp_rtx_synack() now could be called in process context as explained in 0a375c822497 ("tcp: tcp_rtx_synack() can be called from process context").

tcp_rtx_synack() might call tcp_make_synack(), which will touch per-CPU variables with preemption enabled. This causes the following BUG:

BUG: using __this_cpu_add() in preemptible [00000000] code: ThriftIO1/5464 caller is tcp_make_synack+0x841/0xac0 Call Trace: dump_stack_lvl+0x10d/0x1a0 check_preemption_disabled+0x104/0x110 tcp_make_synack+0x841/0xac0 tcp_v6_send_synack+0x5c/0x450 tcp_rtx_synack+0xeb/0x1f0 inet_rtx_syn_ack+0x34/0x60 tcp_check_req+0x3af/0x9e0 tcp_rcv_state_process+0x59b/0x2030 tcp_v6_do_rcv+0x5f5/0x700 release_sock+0x3a/0xf0 tcp_sendmsg+0x33/0x40 ____sys_sendmsg+0x2f2/0x490 __sys_sendmsg+0x184/0x230 do_syscall_64+0x3d/0x90

Avoid calling __TCP_INC_STATS() with will touch per-cpu variables. Use TCP_INC_STATS() which is safe to be called from context switch.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
—
EPSS
5.1%
KEV
Not listed

Published

May 2, 2025

Last Modified

November 10, 2025

References (8)

Vendor Advisories for CVE-2023-53121(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:5.14.0-362.8.1.el9_32023-11-07redhat

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 / 41× 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.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2023-53121?
CVE-2023-53121 is a medium vulnerability published on May 2, 2025. In the Linux kernel, the following vulnerability has been resolved: tcp: tcpmakesynack() can be called from process context tcprtxsynack() now could be called in process context as explained in 0a375c822497 ("tcp: tcprtxsynack() can be called from process context"). tcprtxsynack() might call…
When was CVE-2023-53121 disclosed?
CVE-2023-53121 was first published in the National Vulnerability Database on May 2, 2025, with the most recent update on November 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-53121 actively exploited?
CVE-2023-53121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-53121?
CVE-2023-53121 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2023-53121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-53121, 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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