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TI-2026-31437 Aliases CVE-2026-43258GHSA-rj9j-qfgp-687w

alpha: fix user-space corruption during memory compaction

Priority LOW 33CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.00176 7th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.1.191, 6.6.160, 6.12.75 +3

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.16 and later6.1.191, 6.6.160, 6.12.75, 6.18.16, 6.19.6, 7.0Patch availableCNA
  • Linux VendorLinux Affected 2.6.16 and later Fixed in 6.1.191, 6.6.160, 6.12.75, 6.18.16, 6.19.6, 7.0 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.16.1 to before 6.12.75; 6.13 to before 6.18.16; 6.19 to before 6.19.6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:-:*:*:*:*:*:*2.6.16VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:rc2:*:*:*:*:*:*2.6.16 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:rc3:*:*:*:*:*:*2.6.16 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:rc4:*:*:*:*:*:*2.6.16 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:rc5:*:*:*:*:*:*2.6.16 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:rc6:*:*:*:*:*:*2.6.16 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.16:rc7:*:*:*:*:*:*2.6.16 rc7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.16.1 to before 6.12.75; 6.13 to before 6.18.16; 6.19 to before 6.19.6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:-:*:*:*:*:*:* Versions 2.6.16 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:rc2:*:*:*:*:*:* Versions 2.6.16 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:rc3:*:*:*:*:*:* Versions 2.6.16 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:rc4:*:*:*:*:*:* Versions 2.6.16 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:rc5:*:*:*:*:*:* Versions 2.6.16 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:rc6:*:*:*:*:*:* Versions 2.6.16 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.16:rc7:*:*:*:*:*:* Versions 2.6.16 rc7 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.75, 6.18.16, 6.19.6, 7.0

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Not affected: 5 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43258
  2. 2026-10-03 Alias added: GHSA-rj9j-qfgp-687w
  3. 2026-10-20 Affected versions changed · Red Hat
  4. 2026-10-21 Fix available: Linux/Linux@5593c9b255ae73f57a8b5e696a660032acbd67da, Linux/[email protected] · CNA
  5. 2026-10-21 1 new reference · CNA
  6. 2026-10-30 Fix available: Linux/Linux@01cddfc34bf2a813a2773f1d607305515be55409, Linux/[email protected] · CNA
  7. 2026-10-30 1 new reference · CNA

References

Patch 4

Other 2

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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