mm/page_alloc: clear page->private in free_pages_prepare() (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.17 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
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.
Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05
- https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32
- https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b
- https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f
- https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb
- https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-28573
- GCVE · GCVE-0-2026-43303
CERT-FR advisories
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1298 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1203 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0956 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0927 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0864 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0862 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0809 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0781 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.18.1 < 6.18.16cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 6.19.6cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*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:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 3b8000ae185cb068adbda5f966a3835053c85fd4 < e7790ab165713b79b1617ce659742ceb3a859d05 ; affected 3b8000ae185cb068adbda5f966a3835053c85fd4 < 3edb8ebbf79b9016040e8f3421d723ae3d542b32 ; affected 3b8000ae185cb068adbda5f966a3835053c85fd4 < f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b ; affected 3b8000ae185cb068adbda5f966a3835053c85fd4 < 23b82b7a26182ad840ae67d390d7ec9771e8c00f ; affected 3b8000ae185cb068adbda5f966a3835053c85fd4 < d757c793853ec5483eb41ec2942c300b8fa720fb ; affected 3b8000ae185cb068adbda5f966a3835053c85fd4 < ac1ea219590c09572ed5992dc233bbf7bb70fef9 |
| Linux · Linux | affected 5.18 ; unaffected 0 < 5.18 ; unaffected 6.1.176 ≤ 6.1.* ; unaffected 6.6.143 ≤ 6.6.* ; unaffected 6.12.93 ≤ 6.12.* ; unaffected 6.18.16 ≤ 6.18.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |