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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-89920

KVM: s390: Fix memory corruption by not reinjecting CK machine checks

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix memory corruption by not reinjecting CK machine checks Channel-subsystem damage machine checks are for the host channel subsystem. The guest channel subsystem is emulated in the userspace VMM. There is no point in forwarding such machine checks into the guest. This also simplifies the machine check reinjection and avoids kfree of a stack variable as reported by sashiko. There might be still machine checks that have the ck bit set with another bit (like instruction damage), mask out the CK bit in s390_backup_mcck_info(), like the CP and ED bits already are.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to < 045f3e95a0deccb277c29bd003e1d43c0ad40c90affected
  • 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to < 5c63e2ed840c85e27172ab78e7db3ac77fba281baffected
  • 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to < b7631982fb65dd355acd18e62b384bc8125e9c44affected
  • 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to < 6ee52d3af2a1bf70349cf3f860933c8d221e229aaffected
  • 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to < 7077ec953996acc04b49d1dfc43df1c1a2a74395affected
  • 4d62fcc0b692e3b4058d7d138114c27cd8b011f7 to < 546dde823a36d7283dcf46127c2f3d093443860faffected

Linux Linux

Default version status: affected

  • 4.13affected
  • 0 to < 4.13unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.51 to ≤ 6.18.*unaffected
  • 7.2.5 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References