CVE-2026-29009

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.7% (54th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 8.2 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-08) is not newer than that change (2026-10-24), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-42333 (ENISA EUVD) · GHSA-rqrq-75p3-gc68 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationNo release containing the referenced fix is confirmed: check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
54th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 8, 2026

Last Modified

October 24, 2026

Advisory Details (6)

Auto-updated Oct 26, 2026
Fix referenced — no release confirmed yet.
Web page

U-Boot TCP/NFS Vulnerabilities: Integer Underflow and Buffer Overflow in the World’s Most Popular Bootloader

https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/
Web page

U-Boot < 2026.07-rc2 Buffer Overflow in nfs_readlink_reply() via NFS READLINK | Advisories | VulnCheck

https://www.vulncheck.com/advisories/u-boot-rc3-buffer-overflow-in-nfs-readlink-reply-via-nfs-readlink
Web page

U-Boot – deinde.dev

https://u-boot.org/
Web page

U-Boot v2026.07-rc2 · u-boot / U-Boot · GitLab

https://git.u-boot-project.org/u-boot/u-boot/-/releases/v2026.07-rc2
Web page

net: nfs: fix buffer overflow in nfs_readlink_reply() (d6694018) · Commits · u-boot / U-Boot · GitLab

https://git.u-boot-project.org/u-boot/u-boot/-/commit/d6694018eaddefac6aae974f9cec72fd6e58f1bc
Web page

Coordinated Vulnerability Disclosure - U-Boot Multiple Vulnerabilities (3)

https://lists.denx.de/pipermail/u-boot/2026-May/617853.html

Vendor Advisories for CVE-2026-29009(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
u-boot2021.01+dfsg-5 ... 2025.01-3.2 (53 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
u-boot2023.01+dfsg-2 ... 2025.01-3.2 (24 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
u-boot2025.01-3, 2025.01-3+deb13u1, 2025.01-3.1, 2025.01-3.2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
u-boot2025.01-3, 2025.01-3.1, 2025.01-3.2
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 75× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 420 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 322 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 17:07 UTCEG score recompute
  2. 2026-11-01 17:07 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  3. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  5. 2026-10-31 16:19 UTCEG score recompute
  6. 2026-10-31 16:19 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  7. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  8. 2026-10-30 15:27 UTCEG score recompute
  9. 2026-10-30 15:27 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  10. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  11. 2026-10-29 14:41 UTCEG score recompute
  12. 2026-10-29 14:40 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  13. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  14. 2026-10-28 13:53 UTCEG score recompute
  15. 2026-10-28 13:53 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  16. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  17. 2026-10-27 12:50 UTCEG score recompute
  18. 2026-10-27 12:50 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  19. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  20. 2026-10-26 15:30 UTCEG score recompute
  21. 2026-10-26 15:30 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  22. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  23. 2026-10-25 14:14 UTCEG score recompute
  24. 2026-10-25 14:14 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  25. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.7% · 54th percentile
Show 73 more
  1. 2026-10-24 13:26 UTCEG score recompute
  2. 2026-10-24 13:26 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  3. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  4. 2026-10-23 15:00 UTCEG score recompute
  5. 2026-10-23 15:00 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  6. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  7. 2026-10-22 14:11 UTCEG score recompute
  8. 2026-10-22 14:11 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  9. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  10. 2026-10-21 13:23 UTCEG score recompute
  11. 2026-10-21 13:23 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  12. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-10-20 12:35 UTCEG score recompute
  14. 2026-10-20 12:35 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  15. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  16. 2026-10-19 11:46 UTCEG score recompute
  17. 2026-10-19 11:46 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  18. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  19. 2026-10-18 09:44 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  20. 2026-10-18 03:50 UTCEG score recompute
  21. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  22. 2026-10-17 08:35 UTCEG score recompute
  23. 2026-10-17 08:35 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  24. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  25. 2026-10-16 07:46 UTCEG score recompute
  26. 2026-10-16 07:46 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  27. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  28. 2026-10-15 06:45 UTCEG score recompute
  29. 2026-10-15 06:45 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  30. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  31. 2026-10-14 02:27 UTCEG score recompute
  32. 2026-10-14 02:27 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  33. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  34. 2026-10-12 22:40 UTCEG score recompute
  35. 2026-10-12 22:39 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  36. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  37. 2026-10-12 16:16 UTCEG score recompute
  38. 2026-10-12 08:45 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  39. 2026-10-11 19:58 UTCEG score recompute
  40. 2026-10-11 17:12 UTCEG score recompute
  41. 2026-10-11 14:41 UTCEG score recompute
  42. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  43. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  44. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  45. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  46. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  47. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  48. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  49. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  50. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  51. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  52. 2026-10-01 16:11 UTCEG score recompute
  53. 2026-10-01 16:11 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  54. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  55. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  56. 2026-09-28 13:22 UTCEG score recompute
  57. 2026-09-28 13:22 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  58. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  59. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  60. 2026-09-24 11:48 UTCEG score recompute
  61. 2026-09-24 11:48 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  62. 2026-09-23 10:59 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  63. 2026-09-23 06:10 UTCEG score recompute
  64. 2026-09-23 06:10 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  65. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  66. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  67. 2026-09-18 10:10 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  68. 2026-09-18 05:43 UTCEG score recompute
  69. 2026-09-18 05:43 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2
  70. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  71. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  72. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  73. 2026-09-14 08:29 UTCGHSA enrichmentGHSA-rqrq-75p3-gc68 · GitHub severity HIGH · GitHub CVSS 8.2

Frequently asked(5)

What is CVE-2026-29009?
CVE-2026-29009 is a critical-severity vulnerability; its CVE record was published on July 8, 2026. U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are…
When was CVE-2026-29009 made public?
CVE-2026-29009 was made public on May 8, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on July 8, 2026. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-29009 actively exploited?
CVE-2026-29009 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-29009?
CVE-2026-29009 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-29009?
A fix for CVE-2026-29009 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-29009 are linked in the Vendor Advisories panel on this page.

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