A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op.
An official patch is available. Apply the patch as soon as possible.
CVSS v4.0 Metrics
Exploitability
Attack VectorLocal
ComplexityHigh
RequirementsPresent
PrivilegesLow
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusOfficial Patch
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | PoC | E: U→P | 4.4 → 6.4 |
| 2026-07-21 | nvd | AV: P→L, PR: H→L, UI: A→N, VC: N→H, VI: N→H, VA: N→H | 0.0 → 4.4 |
| 2026-07-21 | nvd | patch: Unavailable→Official Patch | 0.0 → 0.0 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 0.0 |
Affected Software
| Vendor | Product | Version |
|---|
| debian | debian_linux | 9.0 |
| linux | linux_kernel | ≥ 4.15, < 4.19.155 |
| linux | linux_kernel | ≥ 4.20, < 5.4.75 |
| linux | linux_kernel | ≥ 5.5, < 5.9.5 |
| linux | linux_kernel | < 4.4.242 |
| linux | linux_kernel | ≥ 4.5, < 4.9.242 |
| linux | linux_kernel | ≥ 4.10, < 4.14.204 |
| n/a | Linux Kernel | 5.9.2 |
| netapp | 500f_firmware | All versions |
| netapp | a250_firmware | All versions |
| netapp | cloud_backup | All versions |
| netapp | h300e_firmware | All versions |
| netapp | h300s_firmware | All versions |
| netapp | h410c_firmware | All versions |
| netapp | h410s_firmware | All versions |
| netapp | h500e_firmware | All versions |
| netapp | h500s_firmware | All versions |
| netapp | h700e_firmware | All versions |
| netapp | h700s_firmware | All versions |
| netapp | solidfire_\&_hci_management_node | All versions |
| netapp | solidfire_baseboard_management_controller_firmware | All versions |
Published: 2021-05-26
