CVE-2026-43303
mm/page_alloc: clear page->private in free_pages_prepare()
Description
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.
INFO
Published Date :
May 8, 2026, 2:16 p.m.
Last Modified :
June 19, 2026, 1:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the latest stable version.
- Ensure all subsystems clear page->private before freeing.
- Test swap functionality after applying updates.
Public PoC/Exploit Available at Github
CVE-2026-43303 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43303.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43303 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43303
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A conversational voice-to-voice open-weights LLM-powered assistant designed to run on high-end consumer or workstation class hardware
CMake Shell C++ Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43303 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43303 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 19, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32 Added Reference https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05 Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': '23b82b7a26182ad840ae67d390d7ec9771e8c00f', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'd757c793853ec5483eb41ec2942c300b8fa720fb', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'ac1ea219590c09572ed5992dc233bbf7bb70fef9', 'versionType': 'git'}], 'programFiles': ['mm/page_alloc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.16', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '6.19.6', 'versionType': 'semver', 'lessThanOrEqual': '6.19.*'}, {'status': 'unaffected', 'version': '7.0', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['mm/page_alloc.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'e7790ab165713b79b1617ce659742ceb3a859d05', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': '3edb8ebbf79b9016040e8f3421d723ae3d542b32', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': '23b82b7a26182ad840ae67d390d7ec9771e8c00f', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'd757c793853ec5483eb41ec2942c300b8fa720fb', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'ac1ea219590c09572ed5992dc233bbf7bb70fef9', 'versionType': 'git'}], 'programFiles': ['mm/page_alloc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.16', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '6.19.6', 'versionType': 'semver', 'lessThanOrEqual': '6.19.*'}, {'status': 'unaffected', 'version': '7.0', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['mm/page_alloc.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': '23b82b7a26182ad840ae67d390d7ec9771e8c00f', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'd757c793853ec5483eb41ec2942c300b8fa720fb', 'versionType': 'git'}, {'status': 'affected', 'version': '3b8000ae185cb068adbda5f966a3835053c85fd4', 'lessThan': 'ac1ea219590c09572ed5992dc233bbf7bb70fef9', 'versionType': 'git'}], 'programFiles': ['mm/page_alloc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.16', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '6.19.6', 'versionType': 'semver', 'lessThanOrEqual': '6.19.*'}, {'status': 'unaffected', 'version': '7.0', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['mm/page_alloc.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 09, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b -
Initial Analysis by [email protected]
May. 15, 2026
Action Type Old Value New Value Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.6 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.18.1 up to (excluding) 6.18.16 Added Reference Type kernel.org: https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f Added Reference https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9 Added Reference https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb