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CVE-2026-43303

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

Products / packages Linux · Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · 4 more

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 01:40:32 UTC
Linux · CVSS:3.1 · 7.8
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity

high7.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

6 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

3b8000ae185cb068adbda5f966a3835053c85fd4 → before e7790ab165713b79b1617ce659742ceb3a859d05

git versions

3b8000ae185cb068adbda5f966a3835053c85fd4 → before 3edb8ebbf79b9016040e8f3421d723ae3d542b32

git versions

3b8000ae185cb068adbda5f966a3835053c85fd4 → before f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b

git versions

3b8000ae185cb068adbda5f966a3835053c85fd4 → before 23b82b7a26182ad840ae67d390d7ec9771e8c00f

git versions

3b8000ae185cb068adbda5f966a3835053c85fd4 → before d757c793853ec5483eb41ec2942c300b8fa720fb

git versions

3b8000ae185cb068adbda5f966a3835053c85fd4 → before ac1ea219590c09572ed5992dc233bbf7bb70fef9

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

5.18

unaffected

0 → before 5.18

semver versions

6.1.176 → through 6.1.*

semver versions

6.6.143 → through 6.6.*

semver versions

6.12.93 → through 6.12.*

semver versions

6.18.16 → through 6.18.*

semver versions

6.19.6 → through 6.19.*

semver versions

7.0 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.6 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.7 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.6 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.7 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.6 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.7 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.6 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.7 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.6 → before *

custom versions

unaffected

unknown

Other versions: unknown

Siemens · siemens-SADP

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)

1 range
siemens-SADP version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

V3.1.7 → before *

custom versions

unaffected

unknown

Other versions: unknown

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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.

References

9 sources
git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05
Source referenceLinux
git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32
Source referenceLinux
git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b
Source referenceLinux
git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f
Source referenceLinux
git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb
Source referenceLinux
git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9
Source referenceLinux
View 3 more references
cert-portal.siemens.com/productcert/html/ssa-019113.html
Source referencesiemens-SADP
cert-portal.siemens.com/productcert/html/ssa-457936.html
Source referencesiemens-SADP
cert-portal.siemens.com/productcert/html/ssa-784472.html
Source referencesiemens-SADP

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-43303

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-457 ↗

CWE-457 Use of Uninitialized Variable

CISA-ADP

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.18

Before: 6.1.176

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.18

Before: 6.6.143

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.18

Before: 6.12.93

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.18

Before: 6.18.16

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.18

Before: 6.19.6

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.18

Before: 7.0

Applicability preview
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  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.18",
            "versionEndExcluding": "6.1.176"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.18",
            "versionEndExcluding": "6.6.143"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.18",
            "versionEndExcluding": "6.12.93"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.18",
            "versionEndExcluding": "6.18.16"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.18",
            "versionEndExcluding": "6.19.6"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.18",
            "versionEndExcluding": "7.0"
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        ]
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    ]
  }
]
Contributing organizations · 3
Linux

Assigning organization

2026-08-05
siemens-SADP

Additional data publisher

2026-11-10
CISA-ADP

Additional data publisher

2026-10-19

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.