CVE-2025-39817

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2025-09-16. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

A fix is available — apply it.

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

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare

Observed on kernel 6.6 (present on master as well):

BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0 Call trace: kasan_check_range+0xe8/0x190 __asan_loadN+0x1c/0x28 memcmp+0x98/0xd0 efivarfs_d_compare+0x68/0xd8 __d_lookup_rcu_op_compare+0x178/0x218 __d_lookup_rcu+0x1f8/0x228 d_alloc_parallel+0x150/0x648 lookup_open.isra.0+0x5f0/0x8d0 open_last_lookups+0x264/0x828 path_openat+0x130/0x3f8 do_filp_open+0x114/0x248 do_sys_openat2+0x340/0x3c0 __arm64_sys_openat+0x120/0x1a0

If dentry->d_name.len < EFI_VARIABLE_GUID_LEN , 'guid' can become negative, leadings to oob. The issue can be triggered by parallel lookups using invalid filename:

T1 T2 lookup_open ->lookup simple_lookup d_add // invalid dentry is added to hash list

lookup_open d_alloc_parallel __d_lookup_rcu __d_lookup_rcu_op_compare hlist_bl_for_each_entry_rcu // invalid dentry can be retrieved ->d_compare efivarfs_d_compare // oob

Fix it by checking 'guid' before cmp.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

September 16, 2025

Last Modified

August 5, 2026

Advisory Details (10)

Auto-updated Aug 2, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4328-1] linux-6.1 security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
generic Patch Available

[SECURITY] [DLA 4327-1] linux security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c2925cd6207079c3f4d040d082515db78d63afbf
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a6358f8cf64850f3f27857b8ed8c1b08cfc4685c
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/925599eba46045930b850a98ae594d2e3028ac40
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/794399019301944fd6d2e0d7a51b3327e26c410e
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/71581a82f38e5a4d807d71fc1bb59aead80ccf95
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/568e7761279b99c6daa3002290fd6d8047ddb6d2
generic

efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6

Vendor Advisories for CVE-2025-39817(18)

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

Patch Availability(31)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-nolpae (5.15.0.1091.89) @ jammy2026-07-30ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1102.111~20.04.1) @ focal2026-07-30ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-106.106~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1049.52.1) @ noble2026-07-30ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1052.55+fips1) @ noble2026-07-30ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1045.46~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1050.53~22.04.1) @ jammy2026-07-30ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1051.57) @ noble2026-07-30ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1101.99) @ jammy2026-07-30ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2040.41) @ noble2026-07-30ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1052.58+fips1) @ noble2026-07-30ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1029.30) @ noble2026-07-30ubuntu
ubuntulinux-tools-gkeop-5.15 (5.15.0.1080.79) @ jammy2026-07-30ubuntu
redhatkernel-0:3.10.0-1160.147.1.el72026-03-03redhat
redhatkernel-rt-0:3.10.0-1160.147.1.rt56.1299.el72026-03-03redhat
redhatkernel-0:4.18.0-372.179.1.el8_62026-02-11redhat
redhatkernel-0:4.18.0-305.183.1.el8_42026-01-14redhat
redhatkernel-0:4.18.0-193.178.1.el8_22025-12-17redhat
redhatkernel-rt-0:5.14.0-70.155.1.rt21.227.el9_02025-11-25redhat
redhatkernel-0:5.14.0-70.155.1.el9_02025-11-25redhat
redhatkernel-0:4.18.0-477.120.1.el8_82025-11-25redhat
redhatkernel-0:5.14.0-284.148.1.el9_22025-11-25redhat
redhatkernel-rt-0:5.14.0-284.148.1.rt14.433.el9_22025-11-25redhat
redhatkernel-0:5.14.0-427.100.1.el9_42025-11-19redhat
redhatkernel-0:6.12.0-124.9.1.el10_12025-11-12redhat
redhatkernel-0:5.14.0-611.7.1.el9_72025-11-12redhat
redhatkernel-0:4.18.0-553.81.1.el8_102025-10-27redhat
redhatkernel-rt-0:4.18.0-553.81.1.rt7.422.el8_102025-10-27redhat
redhatkernel-0:5.14.0-570.55.1.el9_62025-10-20redhat
redhatkernel-0:6.12.0-55.40.1.el10_02025-10-20redhat
linuxKernel @ 5.4.298—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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (46 versions)5.10.244-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.148-1~deb11u1 (11 versions)6.1.153-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (43 versions)6.1.153-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1, 6.12.41-1, 6.12.43-1, 6.12.43-1~bpo12+16.12.48-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.16~rc7-1~exp1 (63 versions)6.16.5-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(7)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 4× in last 7d / 24× 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 173 total refreshes for this CVE.

  1. 2026-09-13 16:46 UTCEPSS rescore
  2. 2026-09-12 15:00 UTCEPSS rescore
  3. 2026-09-11 09:35 UTCEPSS rescore
  4. 2026-09-10 09:33 UTCEPSS rescore
  5. 2026-09-08 21:59 UTCEPSS rescore
  6. 2026-09-07 16:00 UTCEPSS rescore
  7. 2026-09-07 11:17 UTCOSV refresh
  8. 2026-09-06 13:46 UTCEPSS rescore
  9. 2026-09-04 05:05 UTCEPSS rescore
  10. 2026-09-01 04:38 UTCEPSS rescore
  11. 2026-08-30 19:16 UTCEPSS rescore
  12. 2026-08-30 01:21 UTCEPSS rescore
  13. 2026-08-28 21:40 UTCEPSS rescore
  14. 2026-08-27 14:24 UTCEPSS rescore
  15. 2026-08-26 14:45 UTCEPSS rescore
  16. 2026-08-25 13:48 UTCEPSS rescore
  17. 2026-08-23 00:18 UTCEPSS rescore
  18. 2026-08-21 23:48 UTCEPSS rescore
  19. 2026-08-20 22:54 UTCEPSS rescore
  20. 2026-08-20 20:31 UTCOSV refresh
  21. 2026-08-19 17:03 UTCEPSS rescore
  22. 2026-08-19 17:03 UTCEPSS rescore
  23. 2026-08-18 13:47 UTCEPSS rescore
  24. 2026-08-17 13:46 UTCEPSS rescore
  25. 2026-08-16 14:55 UTCEPSS rescore
Show 75 more
  1. 2026-08-16 02:13 UTCEPSS rescore
  2. 2026-08-15 01:29 UTCEPSS rescore
  3. 2026-08-13 21:59 UTCEPSS rescore
  4. 2026-08-12 13:50 UTCEPSS rescore
  5. 2026-08-09 13:46 UTCEPSS rescore
  6. 2026-08-08 16:36 UTCEPSS rescore
  7. 2026-08-06 13:46 UTCEPSS rescore
  8. 2026-08-05 12:57 UTCEG score recompute
  9. 2026-08-05 12:57 UTCVendor advisory
  10. 2026-08-05 12:57 UTCGHSA enrichment
  11. 2026-08-04 15:09 UTCEPSS rescore
  12. 2026-08-04 10:37 UTCEPSS rescore
  13. 2026-08-03 10:35 UTCEPSS rescore
  14. 2026-08-02 02:26 UTCEPSS rescore
  15. 2026-08-01 04:15 UTCEPSS rescore
  16. 2026-07-30 16:27 UTCEPSS rescore
  17. 2026-07-30 06:53 UTCEG score recompute
  18. 2026-07-30 06:53 UTCVendor advisory
  19. 2026-07-30 06:53 UTCGHSA enrichment
  20. 2026-07-30 06:24 UTCNVD updateCVSS v3 → 7.1 · severity → HIGH
  21. 2026-07-30 01:29 UTCEPSS rescore
  22. 2026-07-28 15:35 UTCEPSS rescore
  23. 2026-07-27 11:39 UTCOSV refresh
  24. 2026-07-26 14:54 UTCEPSS rescore
  25. 2026-07-25 14:17 UTCEPSS rescore
  26. 2026-07-25 14:17 UTCEPSS rescore
  27. 2026-07-24 14:17 UTCEPSS rescore
  28. 2026-07-23 02:55 UTCEG score recompute
  29. 2026-07-22 14:07 UTCEPSS rescore
  30. 2026-07-22 14:07 UTCEPSS rescore
  31. 2026-07-21 15:24 UTCEPSS rescore
  32. 2026-07-20 17:07 UTCEPSS rescore
  33. 2026-07-19 14:30 UTCEPSS rescore
  34. 2026-07-19 14:30 UTCEPSS rescore
  35. 2026-07-19 02:28 UTCEPSS rescore
  36. 2026-07-19 02:28 UTCEPSS rescore
  37. 2026-07-18 10:04 UTCEPSS rescore
  38. 2026-07-18 10:04 UTCEPSS rescore
  39. 2026-07-16 17:02 UTCEPSS rescore
  40. 2026-07-15 16:57 UTCEPSS rescore
  41. 2026-07-15 16:57 UTCEPSS rescore
  42. 2026-07-15 01:59 UTCEPSS rescore
  43. 2026-07-15 01:59 UTCEPSS rescore
  44. 2026-07-13 22:29 UTCEPSS rescore
  45. 2026-07-13 22:29 UTCEPSS rescore
  46. 2026-07-13 06:12 UTCEPSS rescore
  47. 2026-07-12 05:46 UTCEPSS rescore
  48. 2026-07-11 08:27 UTCEPSS rescore
  49. 2026-07-11 08:27 UTCEPSS rescore
  50. 2026-07-10 06:23 UTCOSV refresh
  51. 2026-07-09 19:09 UTCEPSS rescore
  52. 2026-07-09 19:09 UTCEPSS rescore
  53. 2026-07-07 13:45 UTCEPSS rescore
  54. 2026-07-06 16:27 UTCEPSS rescore
  55. 2026-07-06 16:27 UTCEPSS rescore
  56. 2026-07-05 02:30 UTCEPSS rescore
  57. 2026-07-04 06:30 UTCEPSS rescore
  58. 2026-07-01 15:06 UTCEPSS rescore
  59. 2026-07-01 15:06 UTCEPSS rescore
  60. 2026-06-30 23:22 UTCEPSS rescore
  61. 2026-06-30 23:22 UTCEPSS rescore
  62. 2026-06-29 14:06 UTCEPSS rescore
  63. 2026-06-29 14:06 UTCEPSS rescore
  64. 2026-06-28 14:07 UTCEPSS rescore
  65. 2026-06-28 14:07 UTCEPSS rescore
  66. 2026-06-28 04:55 UTCEPSS rescore
  67. 2026-06-28 04:55 UTCEPSS rescore
  68. 2026-06-27 03:08 UTCEPSS rescore
  69. 2026-06-27 03:08 UTCEPSS rescore
  70. 2026-06-25 13:49 UTCEPSS rescore
  71. 2026-06-25 13:49 UTCEPSS rescore
  72. 2026-06-24 14:04 UTCEPSS rescore
  73. 2026-06-24 14:04 UTCEPSS rescore
  74. 2026-06-23 21:32 UTCEPSS rescore
  75. 2026-06-23 21:32 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-39817?
CVE-2025-39817 is a high vulnerability published on September 16, 2025. In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix slab-out-of-bounds in efivarfsdcompare Observed on kernel 6.6 (present on master as well): BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0 Call trace: kasancheckrange+0xe8/0x190 asan_loadN+0x1c/0x28…
When was CVE-2025-39817 disclosed?
CVE-2025-39817 was first published in the National Vulnerability Database on September 16, 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-2025-39817 actively exploited?
CVE-2025-39817 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 94.1% of all scored CVEs.
What is the CVSS score of CVE-2025-39817?
CVE-2025-39817 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2025-39817?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-39817, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-39817

Explore →

Is Your Infrastructure Affected by CVE-2025-39817?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs