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TI-2026-31399 Aliases CVE-2026-43220GHSA-v974-2cjf-22q5

iommu/amd: serialize sequence allocation under concurrent TLB invalidations

Priority LOW 24Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return.

Why it matters now

EPSS 0.00127 2nd percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.2, 6.6.140, 6.12.88

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.1.191 to before 6.26.2Patch availableCNA
LinuxLinux6.6.128 to before 6.6.140; 6.12.75 to before 6.12.886.6.140, 6.12.88Patch availableCNA
  • Linux VendorLinux Affected 6.1.191 to before 6.2 Fixed in 6.2 Patch available CNA
  • Linux VendorLinux Affected 6.6.128 to before 6.6.140; 6.12.75 to before 6.12.88 Fixed in 6.6.140, 6.12.88 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.6.128 to before 6.7; 6.12.75 to before 6.13VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.6.128 to before 6.7; 6.12.75 to before 6.13 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.2
  • Fix · CNA Linux (Linux) Fixed in 6.6.140, 6.12.88

Vendor assessments

Red Hat

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-2026-43220
  2. 2026-10-03 Alias added: GHSA-v974-2cjf-22q5
  3. 2026-10-30 Fix available: Linux/[email protected] · CNA

References

Patch 3

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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences