CVE-2015-7972

LOWCVSS v2 · 2.12.1—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 2.1 — v2 rates that LOW (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:L/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 0.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
2.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: 2.1Exploit: None knownExposed: 0

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

The (1) libxl_set_memory_target function in tools/libxl/libxl.c and (2) libxl__build_post function in tools/libxl/libxl_dom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand (PoD) system, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors related to "heavy memory pressure."

CVSS v2.0 (legacy)
2.1LOWNVD never assigned a CVSS v3 rating to this CVE
EG Score
2.1(low)
EG Risk
14(Track)
EG Risk 14/100SSVC: 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
Severity21% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

October 30, 2015

Last Modified

May 6, 2026

References (20)

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xen—4.6.0-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
xen—4.6.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
xen—4.6.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
xen—4.6.0-1—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
xen4.1.4-3 ... 4.1.4-4 (11 versions)4.1.6.1-1+deb7u1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
xen4.4.1-9, 4.4.1-9+deb8u1, 4.4.1-9+deb8u24.4.1-9+deb8u3—

Data Freshness Timeline

(refreshed 6× in last 7d / 28× 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 127 total refreshes for this CVE.

  1. 2026-08-20 22:50 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
  4. 2026-08-16 14:51 UTCEPSS rescore
  5. 2026-08-16 02:09 UTCEPSS rescore
  6. 2026-08-15 01:25 UTCEPSS rescore
  7. 2026-08-14 15:54 UTCOSV refresh
  8. 2026-08-12 13:46 UTCEPSS rescore
  9. 2026-08-11 13:36 UTCEPSS rescore
  10. 2026-08-09 13:42 UTCEPSS rescore
  11. 2026-08-08 16:32 UTCEPSS rescore
  12. 2026-08-07 16:22 UTCEPSS rescore
  13. 2026-08-06 13:42 UTCEPSS rescore
  14. 2026-08-05 19:12 UTCEPSS rescore
  15. 2026-08-04 15:04 UTCEPSS rescore
  16. 2026-08-04 10:31 UTCEPSS rescore
  17. 2026-08-01 04:11 UTCEPSS rescore
  18. 2026-07-30 04:24 UTCOSV refresh
  19. 2026-07-30 01:26 UTCEPSS rescore
  20. 2026-07-30 01:26 UTCEPSS rescore
  21. 2026-07-28 15:31 UTCEPSS rescore
  22. 2026-07-26 14:50 UTCEPSS rescore
  23. 2026-07-26 13:55 UTCEG score recompute▲ 2.10
  24. 2026-07-25 14:13 UTCEPSS rescore
  25. 2026-07-24 14:13 UTCEPSS rescore
Show 75 more
  1. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:19 UTCEG score recompute
  3. 2026-07-23 00:21 UTCEG score recompute
  4. 2026-07-22 21:59 UTCEG score recompute
  5. 2026-07-22 14:04 UTCEPSS rescore
  6. 2026-07-21 15:21 UTCEPSS rescore
  7. 2026-07-21 15:21 UTCEPSS rescore
  8. 2026-07-20 17:03 UTCEPSS rescore
  9. 2026-07-19 14:27 UTCEPSS rescore
  10. 2026-07-19 14:27 UTCEPSS rescore
  11. 2026-07-19 02:26 UTCEPSS rescore
  12. 2026-07-19 02:26 UTCEPSS rescore
  13. 2026-07-18 10:00 UTCEPSS rescore
  14. 2026-07-16 16:59 UTCEPSS rescore
  15. 2026-07-15 16:54 UTCEPSS rescore
  16. 2026-07-15 16:54 UTCEPSS rescore
  17. 2026-07-15 01:56 UTCEPSS rescore
  18. 2026-07-13 22:26 UTCEPSS rescore
  19. 2026-07-13 22:26 UTCEPSS rescore
  20. 2026-07-12 13:38 UTCOSV refresh
  21. 2026-07-12 05:42 UTCEPSS rescore
  22. 2026-07-11 08:23 UTCEPSS rescore
  23. 2026-07-09 19:05 UTCEPSS rescore
  24. 2026-07-09 19:05 UTCEPSS rescore
  25. 2026-07-08 15:10 UTCEPSS rescore
  26. 2026-07-07 13:42 UTCEPSS rescore
  27. 2026-07-07 13:42 UTCEPSS rescore
  28. 2026-07-06 16:24 UTCEPSS rescore
  29. 2026-07-06 02:20 UTCEPSS rescore
  30. 2026-07-05 02:26 UTCEPSS rescore
  31. 2026-07-04 06:28 UTCEPSS rescore
  32. 2026-07-01 15:02 UTCEPSS rescore
  33. 2026-06-30 23:19 UTCEPSS rescore
  34. 2026-06-30 23:19 UTCEPSS rescore
  35. 2026-06-29 14:03 UTCEPSS rescore
  36. 2026-06-29 14:03 UTCEPSS rescore
  37. 2026-06-28 14:04 UTCEPSS rescore
  38. 2026-06-28 04:53 UTCEPSS rescore
  39. 2026-06-27 03:05 UTCEPSS rescore
  40. 2026-06-25 13:47 UTCEPSS rescore
  41. 2026-06-25 13:47 UTCEPSS rescore
  42. 2026-06-24 14:02 UTCEPSS rescore
  43. 2026-06-24 14:02 UTCEPSS rescore
  44. 2026-06-23 21:30 UTCEPSS rescore
  45. 2026-06-23 19:20 UTCOSV refresh
  46. 2026-06-22 14:23 UTCEPSS rescore
  47. 2026-06-22 14:23 UTCEPSS rescore
  48. 2026-06-21 14:54 UTCEPSS rescore
  49. 2026-06-21 14:54 UTCEPSS rescore
  50. 2026-06-21 01:57 UTCEPSS rescore
  51. 2026-06-21 01:57 UTCEPSS rescore
  52. 2026-06-19 19:23 UTCEPSS rescore
  53. 2026-06-19 19:23 UTCEPSS rescore
  54. 2026-06-18 17:50 UTCEPSS rescore
  55. 2026-06-17 17:50 UTCEPSS rescore
  56. 2026-06-17 17:49 UTCEPSS rescore
  57. 2026-06-16 17:50 UTCEPSS rescore
  58. 2026-06-16 17:50 UTCEPSS rescore
  59. 2026-06-15 17:45 UTCEPSS rescore
  60. 2026-06-14 23:14 UTCEPSS rescore
  61. 2026-06-13 22:57 UTCEPSS rescore
  62. 2026-06-12 23:09 UTCEPSS rescore
  63. 2026-06-12 23:09 UTCEPSS rescore
  64. 2026-06-11 13:57 UTCEPSS rescore
  65. 2026-06-11 13:57 UTCEPSS rescore
  66. 2026-06-10 22:15 UTCEPSS rescore
  67. 2026-06-10 13:18 UTCEPSS rescore
  68. 2026-06-08 14:14 UTCEPSS rescore
  69. 2026-06-07 15:22 UTCEPSS rescore
  70. 2026-06-07 03:29 UTCOSV refresh
  71. 2026-06-06 13:45 UTCEPSS rescore
  72. 2026-06-05 22:44 UTCEPSS rescore
  73. 2026-06-05 06:08 UTCEPSS rescore
  74. 2026-06-05 06:08 UTCEPSS rescore
  75. 2026-06-04 13:10 UTCEPSS rescore

Frequently asked(4)

What is CVE-2015-7972?
CVE-2015-7972 is a low vulnerability published on October 30, 2015. The (1) libxlsetmemorytarget function in tools/libxl/libxl.c and (2) libxlbuildpost function in tools/libxl/libxl_dom.c in Xen 3.4.x through 4.6.x do not properly calculate the balloon size when using the populate-on-demand (PoD) system, which allows local HVM guest users to cause a denial of…
When was CVE-2015-7972 disclosed?
CVE-2015-7972 was first published in the National Vulnerability Database on October 30, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-7972 actively exploited?
CVE-2015-7972 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 64.2% of all scored CVEs.
How do I remediate CVE-2015-7972?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-7972, 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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