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TI-2026-18593 Aliases CVE-2026-23156GHSA-r6pf-fx8p-436v

efivarfs: fix error propagation in efivar_entry_get()

Priority LOW 33Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: efivarfs: fix error propagation in efivar_entry_get() efivar_entry_get() always returns success even if the underlying __efivar_entry_get() fails, masking errors. This may result in uninitialized heap memory being copied to userspace in the efivarfs_file_read() path. Fix it by returning the error from __efivar_entry_get().

Why it matters now

EPSS 0.00141 3rd percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.1.162, 6.6.123, 6.12.69 +2Red Hat: 2 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.0 and later6.1.162, 6.6.123, 6.12.69, 6.18.9, 6.19Patch availableCNA
  • Linux VendorLinux Affected 6.0 and later Fixed in 6.1.162, 6.6.123, 6.12.69, 6.18.9, 6.19 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.0 to before 6.1.162; 6.2 to before 6.6.123; 6.7 to before 6.12.69; 6.13 to before 6.18.9VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*6.19 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*6.19 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*6.19 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*6.19 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*6.19 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*6.19 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*6.19 rc7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.0 to before 6.1.162; 6.2 to before 6.6.123; 6.7 to before 6.12.69; 6.13 to before 6.18.9 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* Versions 6.19 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* Versions 6.19 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* Versions 6.19 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* Versions 6.19 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* Versions 6.19 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* Versions 6.19 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* Versions 6.19 rc7 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.162, 6.6.123, 6.12.69, 6.18.9, 6.19

Red Hat 2 advisories

  • RHSA-2026:9095 Released 2026-04-20 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.69.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.69.1.el10_0, kernel-64k-devel-6.12.0-55.69.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.69.1.el10_0, kernel-64k-6.12.0-55.69.1.el10_0, kernel-64k-core-6.12.0-55.69.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.69.1.el10_0, libperf-6.12.0-55.69.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.69.1.el10_0, kernel-rt-64k-6.12.0-55.69.1.el10_0, kernel-rt-64k-core-6.12.0-55.69.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.69.1.el10_0, kernel-rt-core-6.12.0-55.69.1.el10_0, kernel-rt-debug-6.12.0-55.69.1.el10_0 +11
  • RHSA-2026:4012 Released 2026-03-09 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.43.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.43.1.el10_1, kernel-64k-devel-6.12.0-124.43.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.43.1.el10_1, kernel-64k-6.12.0-124.43.1.el10_1, kernel-64k-core-6.12.0-124.43.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.43.1.el10_1, libperf-6.12.0-124.43.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.43.1.el10_1, kernel-rt-64k-6.12.0-124.43.1.el10_1, kernel-rt-64k-core-6.12.0-124.43.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.43.1.el10_1, kernel-rt-core-6.12.0-124.43.1.el10_1, kernel-rt-debug-6.12.0-124.43.1.el10_1 +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-2026:4012
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:9095
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:4012
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:9095
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-2026-23156
  2. 2026-10-03 Alias added: GHSA-r6pf-fx8p-436v

References

Patch 5

  • 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