CVE-2026-74338

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 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:

bpf: Reject sleepable BPF_LSM_CGROUP programs at load time

The cgroup shim runs under rcu_read_lock_dont_migrate(), so we should not attach any sleepable BPF programs there. Add support to the verifier to explicitly reject attempts to load sleepable BPF programs destined for LSM cgroup attachment.

Without this, we get the following splat from a BPF_LSM_CGROUP program marked BPF_F_SLEEPABLE attached to file_open when it calls bpf_get_dentry_xattr():

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1567 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 34317, name: load preempt_count: 0, expected: 0 RCU nest depth: 2, expected: 0 Call Trace: down_read+0x76/0x480 ext4_xattr_get+0x11f/0x700 __vfs_getxattr+0xf0/0x150 bpf_get_dentry_xattr+0xbb/0xf0 bpf_prog_e76a298dac9218c6_test_open+0x6a/0x85 __cgroup_bpf_run_lsm_current+0x326/0x840 bpf_trampoline_6442534646+0x62/0x14d security_file_open+0x34/0x60 do_dentry_open+0x340/0x1260 vfs_open+0x7a/0x440 path_openat+0x1bac/0x30a0

libbpf provides a .s named section variant for every sleepable program type except lsm_cgroup, reflecting that per-cgroup LSM programs are intended to only run in a non-sleepable context.

The above splat was obtained by bypassing libbpf by using bpf(2) directly.

CVSS v3
7.8
EG Score
7.8(high)
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
3%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

bpf: Reject sleepable BPF_LSM_CGROUP programs at load time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/be9eaf2bb5db4ad3de61ef739fd268fd7f135737
generic

bpf: Reject sleepable BPF_LSM_CGROUP programs at load time - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5b038319be442c620f774e6fc9e9283deeca1c75

Vendor Advisories for CVE-2026-74338(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 29× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 19:56 UTCGHSA enrichment
  3. 2026-08-20 07:45 UTCGHSA enrichment
  4. 2026-08-19 19:36 UTCEG score recompute
  5. 2026-08-19 19:36 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 07:26 UTCGHSA enrichment
  8. 2026-08-18 19:16 UTCEG score recompute
  9. 2026-08-18 19:16 UTCGHSA enrichment
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 07:07 UTCGHSA enrichment
  13. 2026-08-17 18:58 UTCEG score recompute
  14. 2026-08-17 18:57 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 06:26 UTCEG score recompute
  17. 2026-08-17 06:26 UTCGHSA enrichment
  18. 2026-08-17 05:56 UTCEG score recompute▲ 7.80
  19. 2026-08-17 05:56 UTCGHSA enrichment
  20. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  21. 2026-08-17 05:26 UTCEG score recompute
  22. 2026-08-17 05:26 UTCGHSA enrichment
  23. 2026-08-17 05:24 UTCMITRE cvelistV5
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 4 more
  1. 2026-08-16 02:15 UTCEPSS rescore
  2. 2026-08-15 06:23 UTCNVD update
  3. 2026-08-15 06:15 UTCEG score recompute
  4. 2026-08-15 06:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74338?
CVE-2026-74338 is a high vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: bpf: Reject sleepable BPFLSMCGROUP programs at load time The cgroup shim runs under rcureadlockdontmigrate(), so we should not attach any sleepable BPF programs there. Add support to the verifier to explicitly reject attempts to…
When was CVE-2026-74338 disclosed?
CVE-2026-74338 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74338 actively exploited?
CVE-2026-74338 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-74338?
CVE-2026-74338 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-74338?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74338, 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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