CVE-2023-53608

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-10-04. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
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:

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread()

The finalization of nilfs_segctor_thread() can race with nilfs_segctor_kill_thread() which terminates that thread, potentially causing a use-after-free BUG as KASAN detected.

At the end of nilfs_segctor_thread(), it assigns NULL to "sc_task" member of "struct nilfs_sc_info" to indicate the thread has finished, and then notifies nilfs_segctor_kill_thread() of this using waitqueue "sc_wait_task" on the struct nilfs_sc_info.

However, here, immediately after the NULL assignment to "sc_task", it is possible that nilfs_segctor_kill_thread() will detect it and return to continue the deallocation, freeing the nilfs_sc_info structure before the thread does the notification.

This fixes the issue by protecting the NULL assignment to "sc_task" and its notification, with spinlock "sc_state_lock" of the struct nilfs_sc_info. Since nilfs_segctor_kill_thread() does a final check to see if "sc_task" is NULL with "sc_state_lock" locked, this can eliminate the race.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

October 4, 2025

Last Modified

August 5, 2026

Advisory Details (8)

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

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6be49d100c22ffea3287a4b19d7639d259888e33
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b4d80bd6370b81a1725b6b8f7894802c23a14e9f
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bae009a2f1b7c2011d2e92d8c84868d315c0b97e
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/92684e02654c91a61a0b0561433b710bcece19fe
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f32297dba338dc06d62286dedb3cdbd5175b1719
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/613bf23c070d11c525268f2945aa594704a9b764
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0dbf0e64b91ee8fcb278aea93eb06fc7d56ecbcc
generic

nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/034cce77d52ba013ce62b4f5258c29907eb1ada5

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 4.14.313—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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 47× 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 106 total refreshes for this CVE.

  1. 2026-08-05 19:15 UTCEPSS rescore
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  3. 2026-08-05 10:17 UTCEG score recompute
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Frequently asked(5)

What is CVE-2023-53608?
CVE-2023-53608 is a high vulnerability published on October 4, 2025. In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential UAF of struct nilfsscinfo in nilfssegctorthread() The finalization of nilfssegctorthread() can race with nilfssegctorkill_thread() which terminates that thread, potentially causing a use-after-free BUG as…
When was CVE-2023-53608 disclosed?
CVE-2023-53608 was first published in the National Vulnerability Database on October 4, 2025, 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-2023-53608 actively exploited?
CVE-2023-53608 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 96.3% of all scored CVEs.
What is the CVSS score of CVE-2023-53608?
CVE-2023-53608 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-53608?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-53608, 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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