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TI-2026-38367 Aliases CVE-2026-53281GHSA-p9cf-q2gf-35mq

iommu/vt-d: Avoid NULL pointer dereference or refcount corruption

Priority LOW 39CWE-476Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly. If dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally, this lead to a NULL pointer dereference or refcount corruption. If the domain was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt. Even if info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free for the remaining active devices sharing the domain. Fix it by returning early if dev_pasid is NULL, before executing the teardown operations. Issue found by AI review and suggested by Kevin Tian. https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00136 3rd percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.12.114, 6.14, 6.18.33 +2Red Hat: 2 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.12.57 to before 6.12.114; 6.13.3 to before 6.146.12.114, 6.14Patch availableCNA
LinuxLinux6.14 and later6.12.114, 6.18.33, 7.0.10, 7.1Patch availableCNA
  • Linux VendorLinux Affected 6.12.57 to before 6.12.114; 6.13.3 to before 6.14 Fixed in 6.12.114, 6.14 Patch available CNA
  • Linux VendorLinux Affected 6.14 and later Fixed in 6.12.114, 6.18.33, 7.0.10, 7.1 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.12.57 to before 6.13; 6.13.3 to before 6.18.33; 6.19 to before 7.0.10VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*7.1 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*7.1 rc3VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.12.57 to before 6.13; 6.13.3 to before 6.18.33; 6.19 to before 7.0.10 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* Versions 7.1 rc3 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.12.114, 6.14
  • Fix · CNA Linux (Linux) Fixed in 6.12.114, 6.18.33, 7.0.10, 7.1

Red Hat 2 advisories

  • RHSA-2026:47040 Released 2026-07-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.31.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.31.1.el9_8, kernel-64k-devel-5.14.0-687.31.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.31.1.el9_8, kernel-64k-5.14.0-687.31.1.el9_8, kernel-64k-core-5.14.0-687.31.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.31.1.el9_8, libperf-5.14.0-687.31.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.31.1.el9_8, kernel-rt-64k-5.14.0-687.31.1.el9_8, kernel-rt-64k-core-5.14.0-687.31.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.31.1.el9_8, kernel-rt-core-5.14.0-687.31.1.el9_8, kernel-rt-debug-5.14.0-687.31.1.el9_8 +9
  • RHSA-2026:47017 Released 2026-07-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.40.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.40.1.el10_2, kernel-64k-devel-6.12.0-211.40.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.40.1.el10_2, kernel-64k-6.12.0-211.40.1.el10_2, kernel-64k-core-6.12.0-211.40.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.40.1.el10_2, libperf-6.12.0-211.40.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.40.1.el10_2, kernel-rt-64k-6.12.0-211.40.1.el10_2, kernel-rt-64k-core-6.12.0-211.40.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.40.1.el10_2, kernel-rt-core-6.12.0-211.40.1.el10_2, kernel-rt-debug-6.12.0-211.40.1.el10_2 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:47017
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:47017
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:47017
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:47017
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:47040
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:47017
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:47040
Not affected: 4 products
  • 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-2026-53281
  2. 2026-10-03 Alias added: GHSA-p9cf-q2gf-35mq
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-21 Fix available: Linux/[email protected], Linux/Linux@d1a677f9c5e02c4ae49614044ac21296660d1391 · CNA
  5. 2026-10-21 1 new reference · CNA
  6. 2026-10-29 Affected versions changed · Red Hat

References

Patch 3

Advisory 3

Other 1

  • 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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