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TI-2026-31482 Aliases CVE-2026-43303GHSA-6fh9-96ww-pvwq

mm/page_alloc: clear page->private in free_pages_prepare()

Priority LOW 35CWE-457Published · 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
Partial Red Hat: 28 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: clear page->private in free_pages_prepare() Several subsystems (slub, shmem, ttm, etc.) use page->private but don't clear it before freeing pages. When these pages are later allocated as high-order pages and split via split_page(), tail pages retain stale page->private values. This causes a use-after-free in the swap subsystem. The swap code uses page->private to track swap count continuations, assuming freshly allocated pages have page->private == 0. When stale values are present, swap_count_continued() incorrectly assumes the continuation list is valid and iterates over uninitialized page->lru containing LIST_POISON values, causing a crash: KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107] RIP: 0010:__do_sys_swapoff+0x1151/0x1860 Fix this by clearing page->private in free_pages_prepare(), ensuring all freed pages have clean state regardless of previous use.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00172 6th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.176, 6.6.143, 6.12.93 +3Red Hat: 7 advisoriesRed Hat: 28 fixed, 2 without a fix

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
LinuxLinux5.18 and later6.1.176, 6.6.143, 6.12.93, 6.18.16, 6.19.6, 7.0Patch availableCNA
  • Linux VendorLinux Affected 5.18 and later Fixed in 6.1.176, 6.6.143, 6.12.93, 6.18.16, 6.19.6, 7.0 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.18.1 to before 6.18.16; 6.19 to before 6.19.6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*5.18VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:*5.18 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:*5.18 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:*5.18 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*5.18 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:*5.18 rc9VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.18.1 to before 6.18.16; 6.19 to before 6.19.6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:* Versions 5.18 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:* Versions 5.18 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:* Versions 5.18 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:* Versions 5.18 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:* Versions 5.18 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:* Versions 5.18 rc9 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.176, 6.6.143, 6.12.93, 6.18.16, 6.19.6, 7.0

Red Hat 7 advisories

  • RHSA-2026:33215 Released 2026-06-29 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.84.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.84.1.el10_0, kernel-64k-devel-6.12.0-55.84.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.84.1.el10_0, kernel-64k-6.12.0-55.84.1.el10_0, kernel-64k-core-6.12.0-55.84.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.84.1.el10_0, libperf-6.12.0-55.84.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.84.1.el10_0, kernel-rt-64k-6.12.0-55.84.1.el10_0, kernel-rt-64k-core-6.12.0-55.84.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.84.1.el10_0, kernel-rt-core-6.12.0-55.84.1.el10_0, kernel-rt-debug-6.12.0-55.84.1.el10_0 +11
  • RHSA-2026:27708 Released 2026-06-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.123.1.el9_6, libperf-5.14.0-570.123.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.123.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.123.1.el9_6, kernel-64k-devel-5.14.0-570.123.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.123.1.el9_6, kernel-64k-5.14.0-570.123.1.el9_6, kernel-64k-core-5.14.0-570.123.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.123.1.el9_6, kernel-rt-64k-5.14.0-570.123.1.el9_6, kernel-rt-64k-core-5.14.0-570.123.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.123.1.el9_6, kernel-rt-core-5.14.0-570.123.1.el9_6, kernel-rt-debug-5.14.0-570.123.1.el9_6 +11
  • RHSA-2026:27735 Released 2026-06-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.132.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.132.1.el9_4, kernel-64k-devel-5.14.0-427.132.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.132.1.el9_4, kernel-5.14.0-427.132.1.el9_4, kernel-64k-5.14.0-427.132.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.132.1.el9_4, kernel-rt-core-5.14.0-427.132.1.el9_4, kernel-rt-debug-5.14.0-427.132.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.132.1.el9_4, kernel-rt-core-5.14.0-427.132.1.el9_4, kernel-rt-debug-5.14.0-427.132.1.el9_4 +11
Show 4 more Red Hat advisories
  • RHSA-2026:26515 Released 2026-06-17 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.176.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.176.1.el9_2, kernel-64k-devel-5.14.0-284.176.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.176.1.el9_2, kernel-5.14.0-284.176.1.el9_2, kernel-64k-5.14.0-284.176.1.el9_2 +29
  • RHSA-2026:26462 Released 2026-06-17 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-core-5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-debug-5.14.0-284.176.1.rt14.461.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-core-5.14.0-284.176.1.rt14.461.el9_2, kernel-rt-debug-5.14.0-284.176.1.rt14.461.el9_2 +11
  • RHSA-2026:21556 Released 2026-05-28 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.12.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.12.1.el9_8, kernel-64k-devel-5.14.0-687.12.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.12.1.el9_8, kernel-64k-5.14.0-687.12.1.el9_8, kernel-64k-core-5.14.0-687.12.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.12.1.el9_8, libperf-5.14.0-687.12.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.12.1.el9_8, kernel-rt-64k-5.14.0-687.12.1.el9_8, kernel-rt-64k-core-5.14.0-687.12.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.12.1.el9_8, kernel-rt-core-5.14.0-687.12.1.el9_8, kernel-rt-debug-5.14.0-687.12.1.el9_8 +9
  • RHSA-2026:21557 Released 2026-05-28 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.18.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.18.1.el10_2, kernel-64k-devel-6.12.0-211.18.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.18.1.el10_2, kernel-64k-6.12.0-211.18.1.el10_2, kernel-64k-core-6.12.0-211.18.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.18.1.el10_2, libperf-6.12.0-211.18.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.18.1.el10_2, kernel-rt-64k-6.12.0-211.18.1.el10_2, kernel-rt-64k-core-6.12.0-211.18.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.18.1.el10_2, kernel-rt-core-6.12.0-211.18.1.el10_2, kernel-rt-debug-6.12.0-211.18.1.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 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:21557
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:21556
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:26515
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:33215
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:21557
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:21556
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:26515
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:33215
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:21557
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:21556
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:33215
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:21557
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:21556
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:26462
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:33215
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:21557
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:21556
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:26462
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:33215
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:27708
Not affected: 2 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43303
  2. 2026-10-03 Alias added: GHSA-6fh9-96ww-pvwq
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP

References

Patch 3

Other 3

  • 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