Read the docs
TI-2026-45932 Aliases CVE-2026-64368GHSA-m4hc-cp9r-f6rj

mm/slab: do not limit zeroing to orig_size when only red zoning is enabled

Priority LOW 37CWE-665Published · Updated

Key facts

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

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

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/slab: do not limit zeroing to orig_size when only red zoning is enabled When init (zeroing) on allocation is requested, for kmalloc() we generally have to zero the full object size even if a smaller size is requested, in order to provide krealloc()'s __GFP_ZERO guarantees. But if we track the requested size, krealloc() uses that information to do the right thing, so we can zero only the requested size. With red zoning also enabled, any extra size became part of the red zone, so it must not be zeroed and thus we must zero only the requested size. However the current check is imprecise, and will trigger also when only SLAB_RED_ZONE is enabled without SLAB_STORE_USER (which enables tracking the requested size). This means enabling red zoning alone can compromise krealloc()'s __GFP_ZERO contract. Fix this by using slub_debug_orig_size() instead, which is the exact check for whether the requested size is tracked. We don't need to care if red zoning is also enabled or not. Also update and expand the comment accordingly.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00417 36th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.6.145, 6.12.96, 6.18.39 +2Red Hat: 5 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
LinuxLinux6.2 and later6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.2 and later Fixed in 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2

Red Hat 5 advisories

  • RHSA-2026:75560 Released 2026-10-05 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.108.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.108.1.el10_0, kernel-64k-devel-6.12.0-55.108.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.108.1.el10_0, kernel-64k-6.12.0-55.108.1.el10_0, kernel-64k-core-6.12.0-55.108.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.108.1.el10_0, libperf-6.12.0-55.108.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.108.1.el10_0, kernel-rt-64k-6.12.0-55.108.1.el10_0, kernel-rt-64k-core-6.12.0-55.108.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.108.1.el10_0, kernel-rt-core-6.12.0-55.108.1.el10_0, kernel-rt-debug-6.12.0-55.108.1.el10_0 +11
  • RHSA-2026:70484 Released 2026-09-23 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.142.1.el9_6, libperf-5.14.0-570.142.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.142.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.142.1.el9_6, kernel-64k-devel-5.14.0-570.142.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.142.1.el9_6, kernel-64k-5.14.0-570.142.1.el9_6, kernel-64k-core-5.14.0-570.142.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.142.1.el9_6, kernel-rt-64k-5.14.0-570.142.1.el9_6, kernel-rt-64k-core-5.14.0-570.142.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.142.1.el9_6, kernel-rt-core-5.14.0-570.142.1.el9_6, kernel-rt-debug-5.14.0-570.142.1.el9_6 +11
  • RHSA-2026:69908 Released 2026-09-22 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.151.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.151.1.el9_4, kernel-64k-devel-5.14.0-427.151.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.151.1.el9_4, kernel-5.14.0-427.151.1.el9_4, kernel-64k-5.14.0-427.151.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.151.1.el9_4, kernel-rt-core-5.14.0-427.151.1.el9_4, kernel-rt-debug-5.14.0-427.151.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.151.1.el9_4, kernel-rt-core-5.14.0-427.151.1.el9_4, kernel-rt-debug-5.14.0-427.151.1.el9_4 +11
Show 2 more Red Hat advisories
  • RHSA-2026:53329 Released 2026-08-11 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.38.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.38.1.el9_8, kernel-64k-devel-5.14.0-687.38.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.38.1.el9_8, kernel-64k-5.14.0-687.38.1.el9_8, kernel-64k-core-5.14.0-687.38.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.38.1.el9_8, libperf-5.14.0-687.38.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.38.1.el9_8, kernel-rt-64k-5.14.0-687.38.1.el9_8, kernel-rt-64k-core-5.14.0-687.38.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.38.1.el9_8, kernel-rt-core-5.14.0-687.38.1.el9_8, kernel-rt-debug-5.14.0-687.38.1.el9_8 +9
  • RHSA-2026:53330 Released 2026-08-11 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.46.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.46.1.el10_2, kernel-64k-devel-6.12.0-211.46.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.46.1.el10_2, kernel-64k-6.12.0-211.46.1.el10_2, kernel-64k-core-6.12.0-211.46.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.46.1.el10_2, libperf-6.12.0-211.46.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.46.1.el10_2, kernel-rt-64k-6.12.0-211.46.1.el10_2, kernel-rt-64k-core-6.12.0-211.46.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.46.1.el10_2, kernel-rt-core-6.12.0-211.46.1.el10_2, kernel-rt-debug-6.12.0-211.46.1.el10_2 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:70484
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:53330
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:53329
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:69908
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:75560
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:70484
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:53330
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:53329
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:69908
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:75560
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:70484
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:53330
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:53329
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:75560
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:53330
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:53329
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:69908
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:75560
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:70484
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:53330
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:53329
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:69908
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:75560
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:70484
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-2026-64368
  2. 2026-10-03 Alias added: GHSA-m4hc-cp9r-f6rj
  3. 2026-10-05 Fix available: RHSA-2026:75560 · Red Hat
  4. 2026-10-05 Fix available: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) +2 · Red Hat
  5. 2026-10-13 Affected versions changed · Red Hat
  6. 2026-10-16 CISA SSVC decision points changed
  7. 2026-10-20 Weakness changed · CISA ADP
  8. 2026-10-29 Affected versions changed · Red Hat

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