CVE-2026-53243

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

rseq: Fix using an uninitialized stack variable in rseq_exit_user_update()

There is an bug in which an uninitialized stack variable is used in rseq_exit_user_update() as reported by syzbot:

BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline]

The local variable:

struct rseq_ids ids = { .cpu_id = task_cpu(t), .mm_cid = task_mm_cid(t), .node_id = cpu_to_node(ids.cpu_id), };

According to the C standard, the evaluation order of expressions in an initializer list is indeterminately sequenced. The compiler (Clang, in this KMSAN build) evaluates cpu_to_node(ids.cpu_id) *before* ids.cpu_id is initialized with task_cpu(t).

This is fixed by moving the assignment of ids.node_id outside the structure initialization.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

Published

June 25, 2026

Last Modified

July 7, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
Patch available.
generic

rseq: Fix using an uninitialized stack variable in rseq_exit_user_update() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e12d20a63b61aaf9de4772effccf42cc9a003e58
generic

rseq: Fix using an uninitialized stack variable in rseq_exit_user_update() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6d99479799c69c3cb588fcda19c81d8f61d64ecd

Vendor Advisories for CVE-2026-53243(1)

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

Patch Availability(8)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1019.19) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1011.11) @ resolute2026-09-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18) @ resolute2026-09-23ubuntu
ubuntulinux-tools-ibm-7.0 (7.0.0-1013.13) @ resolute2026-09-23ubuntu

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

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (146 versions)
  • every version up to 7.0.13-1: fixed in 7.0.13-1
—

Weakness Classification(1)

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

All Vendor Advisories

(8)

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 6× in last 7d / 33× 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 178 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-02 17:56 UTCEPSS rescore
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-09-30 15:03 UTCEPSS rescore
  10. 2026-09-29 15:22 UTCEPSS rescore
  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-26 00:27 UTCEPSS rescore
  15. 2026-09-23 17:53 UTCEPSS rescore
  16. 2026-09-23 09:14 UTCEG score recompute
  17. 2026-09-23 09:14 UTCVendor advisory
  18. 2026-09-23 09:14 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 07:30 UTCEG score recompute
  22. 2026-09-18 07:30 UTCVendor advisory
  23. 2026-09-18 07:30 UTCGHSA enrichment
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 75 more
  1. 2026-09-14 01:23 UTCEG score recompute
  2. 2026-09-14 01:23 UTCVendor advisory
  3. 2026-09-14 01:23 UTCGHSA enrichment
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-12 15:56 UTCEG score recompute
  6. 2026-09-12 15:56 UTCVendor advisory
  7. 2026-09-12 15:56 UTCGHSA enrichment
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-10 09:35 UTCEPSS rescore
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:12 UTCEPSS rescore
  15. 2026-09-01 13:54 UTCEPSS rescore
  16. 2026-09-01 04:40 UTCEPSS rescore
  17. 2026-08-30 19:37 UTCEG score recompute
  18. 2026-08-30 19:37 UTCGHSA enrichment
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:41 UTCEPSS rescore
  22. 2026-08-27 23:58 UTCEG score recompute
  23. 2026-08-27 23:58 UTCGHSA enrichment
  24. 2026-08-27 14:25 UTCEPSS rescore
  25. 2026-08-26 14:46 UTCEPSS rescore
  26. 2026-08-25 13:49 UTCEPSS rescore
  27. 2026-08-24 13:12 UTCEG score recompute
  28. 2026-08-24 13:12 UTCGHSA enrichment
  29. 2026-08-23 09:26 UTCEG score recompute
  30. 2026-08-23 09:26 UTCGHSA enrichment
  31. 2026-08-23 00:19 UTCEPSS rescore
  32. 2026-08-22 10:42 UTCGHSA enrichment
  33. 2026-08-21 05:52 UTCEG score recompute
  34. 2026-08-21 05:52 UTCGHSA enrichment
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-20 07:07 UTCEG score recompute
  37. 2026-08-20 07:07 UTCGHSA enrichment
  38. 2026-08-19 17:04 UTCEPSS rescore
  39. 2026-08-19 01:31 UTCEG score recompute
  40. 2026-08-19 01:31 UTCGHSA enrichment
  41. 2026-08-18 13:48 UTCEPSS rescore
  42. 2026-08-17 13:47 UTCEPSS rescore
  43. 2026-08-17 02:46 UTCEG score recompute
  44. 2026-08-17 02:46 UTCGHSA enrichment
  45. 2026-08-16 14:56 UTCEPSS rescore
  46. 2026-08-16 04:01 UTCEG score recompute
  47. 2026-08-16 04:01 UTCGHSA enrichment
  48. 2026-08-16 02:14 UTCEPSS rescore
  49. 2026-08-15 05:16 UTCEG score recompute
  50. 2026-08-15 05:16 UTCGHSA enrichment
  51. 2026-08-15 01:30 UTCEPSS rescore
  52. 2026-08-14 06:31 UTCEG score recompute
  53. 2026-08-14 06:31 UTCGHSA enrichment
  54. 2026-08-13 22:00 UTCEPSS rescore
  55. 2026-08-13 07:46 UTCEG score recompute
  56. 2026-08-13 07:46 UTCGHSA enrichment
  57. 2026-08-12 13:51 UTCEPSS rescore
  58. 2026-08-12 08:24 UTCEG score recompute
  59. 2026-08-12 08:24 UTCGHSA enrichment
  60. 2026-08-11 09:39 UTCEG score recompute
  61. 2026-08-11 09:39 UTCGHSA enrichment
  62. 2026-08-11 00:00 UTCEPSS rescore
  63. 2026-08-10 10:55 UTCEG score recompute
  64. 2026-08-10 10:55 UTCGHSA enrichment
  65. 2026-08-09 13:46 UTCEPSS rescore
  66. 2026-08-09 12:10 UTCGHSA enrichment
  67. 2026-08-08 13:25 UTCEG score recompute
  68. 2026-08-08 13:25 UTCGHSA enrichment
  69. 2026-08-07 14:40 UTCGHSA enrichment
  70. 2026-08-06 15:56 UTCEG score recompute
  71. 2026-08-06 15:56 UTCGHSA enrichment
  72. 2026-08-06 13:47 UTCEPSS rescore
  73. 2026-08-05 17:10 UTCGHSA enrichment
  74. 2026-08-04 18:23 UTCEG score recompute
  75. 2026-08-04 18:23 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53243?
CVE-2026-53243 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: rseq: Fix using an uninitialized stack variable in rseqexituser_update() There is an bug in which an uninitialized stack variable is used in rseqexituser_update() as reported by syzbot: BUG: KMSAN: kernel-infoleak in…
When was CVE-2026-53243 disclosed?
CVE-2026-53243 was first published on June 25, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53243 actively exploited?
CVE-2026-53243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53243?
CVE-2026-53243 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53243?
A fix for CVE-2026-53243 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53243 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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