CVE-2026-97937

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-25. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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

ftrace: fork: Initialize function graph state before copy_exec_state()

dup_task_struct() copies the parent's task_struct, including ret_stack. ftrace_graph_init_task() clears the copied function graph state, but it currently runs after copy_exec_state().

For non-CLONE_VM forks, copy_exec_state() allocates a new task_exec_state. If that allocation fails, copy_process() reaches bad_fork_free and free_task() calls ftrace_graph_exit_task(). Since the child still carries the parent's ret_stack pointer, the unwind frees the parent's active function graph return stack. The parent subsequently accesses freed memory from function_graph_enter_regs().

KASAN reports:

[ 22.190920] ================================================================== [ 22.195899] BUG: KASAN: slab-use-after-free in function_graph_enter_regs+0xa76/0xb90 [ 22.200747] Write of size 8 at addr ff110000054dc0a8 by task repro/1 [ 22.205134] [ 22.210770] CPU: 0 UID: 0 PID: 1 Comm: repro Not tainted 7.2.0-07732-g9328b3b03bdc-dirty #3 PREEMPT(lazy) [ 22.212576] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.213750] Call Trace: [ 22.215271] [ 22.216242] ? ftrace_stub_direct_tramp+0x10/0x10 [ 22.217774] dump_stack_lvl+0x4e/0x70 [ 22.220531] print_report+0x157/0x4b4 [ 22.223202] ? fixup_red_left+0x9/0x30 [ 22.224407] ? complete_report_info+0x83/0x110 [ 22.226679] ? function_graph_enter_regs+0xa76/0xb90 [ 22.228084] kasan_report+0xce/0x100 [ 22.230109] ? function_graph_enter_regs+0xa76/0xb90 [ 22.232860] ? stack_trace_save+0x4/0xd0 [ 22.234156] function_graph_enter_regs+0xa76/0xb90 [ 22.236090] ? kasan_save_stack+0x30/0x50 [ 22.237752] ? __pfx_function_graph_enter_regs+0x10/0x10 [ 22.238694] ? ring_buffer_lock_reserve+0x345/0xf80 [ 22.239628] ? stack_trace_save+0x4/0xd0 [ 22.242121] ? stack_trace_save+0x4/0xd0 [ 22.243588] ftrace_graph_func+0xda/0x160 [ 22.245362] ? ftrace_stub_direct_tramp+0x10/0x10 [ 22.246520] 0xffffffffa0000095 [ 22.250528] ? stack_trace_save+0x9/0xd0 [ 22.251757] ? ring_buffer_unlock_commit+0x11d/0x5c0 [ 22.253152] stack_trace_save+0x9/0xd0 [ 22.254264] kasan_save_stack+0x30/0x50 [ 22.273631] kasan_save_track+0x14/0x30 [ 22.276763] kasan_save_free_info+0x3b/0x70 [ 22.278296] __kasan_slab_free+0x43/0x70 [ 22.280157] kmem_cache_free+0xbf/0x3b0 [ 22.282963] ? ftrace_stub_direct_tramp+0x10/0x10 [ 22.284001] free_task+0xa2/0x160 [ 22.285699] ? ftrace_stub_direct_tramp+0x10/0x10 [ 22.286752] copy_process+0x2aae/0x7bc0

Initialize the child function graph state immediately after dup_task_struct(), before the first fallible operation.

CVSS v3
7.8
EG Score
7.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
3rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 25, 2026

Advisory Details (2)

Auto-updated Sep 25, 2026
No patch confirmed yet.
generic

ftrace: fork: Initialize function graph state before copy_exec_state() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/08cacffeef8f64f1a222c93467ca84f24a46c953
generic

ftrace: fork: Initialize function graph state before copy_exec_state() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1fadebbbf31f65beba353fa9d1373bf183e03fed

Vendor Advisories for CVE-2026-97937(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (179 versions)
  • every version up to 7.2.7-1: fixed in 7.2.7-1
—

Data Freshness Timeline

(refreshed 26× in last 7d / 44× 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. 2026-10-05 00:21 UTCEG score recompute
  2. 2026-10-05 00:21 UTCGHSA enrichment
  3. 2026-10-04 23:23 UTCEPSS rescore
  4. 2026-10-04 11:06 UTCGHSA enrichment
  5. 2026-10-03 21:55 UTCEG score recompute
  6. 2026-10-03 21:55 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 08:35 UTCGHSA enrichment
  9. 2026-10-02 19:23 UTCEG score recompute
  10. 2026-10-02 19:23 UTCGHSA enrichment
  11. 2026-10-02 17:57 UTCEPSS rescore
  12. 2026-10-02 06:12 UTCEG score recompute
  13. 2026-10-02 06:12 UTCGHSA enrichment
  14. 2026-10-01 19:51 UTCEPSS rescore
  15. 2026-10-01 17:01 UTCGHSA enrichment
  16. 2026-10-01 03:22 UTCEG score recompute
  17. 2026-10-01 03:22 UTCGHSA enrichment
  18. 2026-09-30 15:04 UTCEPSS rescore
  19. 2026-09-30 14:10 UTCGHSA enrichment
  20. 2026-09-30 00:59 UTCEG score recompute
  21. 2026-09-30 00:59 UTCGHSA enrichment
  22. 2026-09-29 11:47 UTCGHSA enrichment
  23. 2026-09-28 22:36 UTCEG score recompute
  24. 2026-09-28 22:36 UTCGHSA enrichment
  25. 2026-09-28 13:52 UTCEPSS rescore
Show 19 more
  1. 2026-09-28 13:52 UTCEPSS rescore
  2. 2026-09-28 09:25 UTCGHSA enrichment
  3. 2026-09-27 20:14 UTCEG score recompute
  4. 2026-09-27 20:14 UTCGHSA enrichment
  5. 2026-09-27 13:49 UTCEPSS rescore
  6. 2026-09-27 07:03 UTCGHSA enrichment
  7. 2026-09-26 17:51 UTCEG score recompute
  8. 2026-09-26 17:51 UTCGHSA enrichment
  9. 2026-09-26 15:59 UTCEPSS rescore
  10. 2026-09-26 04:38 UTCEG score recompute
  11. 2026-09-26 04:37 UTCGHSA enrichment
  12. 2026-09-25 15:24 UTCEG score recompute
  13. 2026-09-25 15:24 UTCGHSA enrichment
  14. 2026-09-25 14:52 UTCEG score recompute▲ 7.80
  15. 2026-09-25 14:52 UTCGHSA enrichment
  16. 2026-09-25 14:49 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  17. 2026-09-25 11:30 UTCNVD update
  18. 2026-09-25 10:34 UTCEG score recompute
  19. 2026-09-25 10:27 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-97937?
CVE-2026-97937 is a high vulnerability published on September 25, 2026. In the Linux kernel, the following vulnerability has been resolved: ftrace: fork: Initialize function graph state before copyexecstate() duptaskstruct() copies the parent's taskstruct, including retstack. ftracegraphinit_task() clears the copied function graph state, but it currently runs after…
When was CVE-2026-97937 disclosed?
CVE-2026-97937 was first published on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-97937 actively exploited?
CVE-2026-97937 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-97937?
CVE-2026-97937 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-97937?
No fix for CVE-2026-97937 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-97937 are linked in the Vendor Advisories panel on this page.

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