CVE-2026-43258

HIGH EPSS 3.6%
Published May 6, 20261mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: alpha: fix user-space corruption during memory compaction Alpha systems can suffer sporadic user-space crashes and heap corruption when memory compaction is enabled. Symptoms include SIGSEGV, glibc allocator failures (e.g. "unaligned tcache chunk"), and compiler internal errors. The failures disappear when compaction is disabled or when using global TLB invalidation. The root cause is insufficient TLB shootdown during page migration. Alpha relies on ASN-based MM context rollover for instruction cache coherency, but this alone is not sufficient to prevent stale data or instruction translations from surviving migration. Fix this by introducing a migration-specific helper that combines: - MM context invalidation (ASN rollover), - immediate per-CPU TLB invalidation (TBI), - synchronous cross-CPU shootdown when required. The helper is used only by migration/compaction paths to avoid changing global TLB semantics. Additionally, update flush_tlb_other(), pte_clear(), to use READ_ONCE()/WRITE_ONCE() for correct SMP memory ordering. This fixes observed crashes on both UP and SMP Alpha systems.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
3.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥2.6.16.1  –  <6.12.75
linuxlinux_kernel*≥6.13  –  <6.18.16
linuxlinux_kernel*≥6.19  –  <6.19.6
linuxlinux_kernel2.6.16any
linuxlinux_kernel2.6.16any
linuxlinux_kernel2.6.16any
linuxlinux_kernel2.6.16any
linuxlinux_kernel2.6.16any
linuxlinux_kernel2.6.16any
linuxlinux_kernel2.6.16any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bab8d762a8dbb816b10011e13b87d1bca91e5f77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd5712f3379cfe760267cdd28ff957d9ab4e51c7
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bab8d762a8dbb816b10011e13b87d1bca91e5f77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd5712f3379cfe760267cdd28ff957d9ab4e51c7
    Patch