Answer in brief
CVE-2026-43258 records a Unknown severity vulnerability in alpha: fix user-space corruption during memory compaction. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a48d07afdf18212de22b959715b16793c5a6e57a <d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6 || >=a48d07afdf18212de22b959715b16793c5a6e57a <03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f || >=a48d07afdf18212de22b959715b16793c5a6e57a <bab8d762a8dbb816b10011e13b87d1bca91e5f77 || >=a48d07afdf18212de22b959715b16793c5a6e57a <dd5712f3379cfe760267cdd28ff957d9ab4e51c7 | d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6, 03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f, bab8d762a8dbb816b10011e13b87d1bca91e5f77, dd5712f3379cfe760267cdd28ff957d9ab4e51c7 |
| Linux/Linuxgeneric | 2.6.16 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-43258 records a Unknown severity vulnerability in alpha: fix user-space corruption during memory compaction. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a48d07afdf18212de22b959715b16793c5a6e57a <d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6 || >=a48d07afdf18212de22b959715b16793c5a6e57a <03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f || >=a48d07afdf18212de22b959715b16793c5a6e57a <bab8d762a8dbb816b10011e13b87d1bca91e5f77 || >=a48d07afdf18212de22b959715b16793c5a6e57a <dd5712f3379cfe760267cdd28ff957d9ab4e51c7 | d4ca6ca2c6f5a1d19d9014c5b36d96637846b5d6, 03e42b5f7ad4c2c3db8bd384bab7990d5d53c90f, bab8d762a8dbb816b10011e13b87d1bca91e5f77, dd5712f3379cfe760267cdd28ff957d9ab4e51c7 |
| Linux/Linuxgeneric | 2.6.16 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.