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NVD / CVE Program· CNA Linux

CVE-2026-74599: mm/ptdump: always stabilise against page table freeing using init_mm

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 27c32e5538344b13c1505a08861e04620c125d47, 3c0391b9a774cc0854f3152e484a9d4835b12b40, 4.10; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 27c32e5538344b13c1505a08861e04620c125d47, 3c0391b9a774cc0854f3152e484a9d4835b12b40, 4.10; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: mm/ptdump: always stabilise against page table freeing using init_mm Previous commits have established the invariant that kernel page table freeing is performed while an mmap read lock on init_mm is held, which fixes races between ptdump and kernel page table freeing over init_mm. However, x86 and arm64 can perform a ptdump over an mm other than init_mm via ptdump_walk_pgd() and since kernel memory ranges are shared across non-kernel mm's, this means that the race still exists for these cases. Fix this by acquiring a nested mmap write lock for init_mm in ptdump_walk_pgd(). This is safe as we take this after mmap write locking the mm, and nothing acquires the init_mm lock first before locking an arbitrary mm, so no deadlock is possible. Also update walk_page_range_debug() to assert that init_mm is write locked, add a comment explaining why and remove some redundant code, and eliminate the unnecessary and confusing invocation of walk_kernel_page_table_range(). We can safely remove the non-NULL check for walk.mm, as the mmap lock asserts would NULL pointer deref if it was (and of course no callers do this). The first point at which ptdump can race kernel page table freeing is commit b6bdb7517c3d ("mm/vmalloc: add interfaces to free unmapped page table"), so we target this in the Fixes tag.

—No exploit Fix available
Published
Aug 22, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 31895cfd79564111cdd5a9f48c5d491ae26a238e, 9c7f7bdb1932f8c1e5f80d32c717184701afe701, acdb4981644c8e31ccee294bdefff475c0cf587b, 0454e2fad9306961540ee7e84da47a8e345b7d22, 4.16affected
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before 3c0391b9a774cc0854f3152e484a9d4835b12b40affected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before cbd9583bb6f70733d0022a66d3546a15c76ae744affected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before 42c9464975cf21346a8950b8ba0ac3234b385be1affected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before 76df4edf7d61ecb711bc517ff4c20a5e85c4e9f7affected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before b9c6d048bdfaae78d7d921b454f7de7baefaa2f0affected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before 7f740664aec1f832953c2e6d9b8920cd6c8bcc0caffected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before 4adc4c9a9a43d61fe476dfe10811f3df2e7e4106affected · git
    • b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e and later · before 27c32e5538344b13c1505a08861e04620c125d47affected · git
    • 4.4.125 and later · before 4.5affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.9-17.1.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74597Aug 22, 2026 · ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
    39Monitor
  • ← EarlierCVE-2026-74598Aug 22, 2026 · ipv6: fix Route Information option length validation
    30Monitor
  • Later →CVE-2026-74600Aug 22, 2026 · mm/page_table_check: skip special zero mappings
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux27c32e5538344b13c1505a08861e04620c125d47Vendor (CNA)
Linux Linux3c0391b9a774cc0854f3152e484a9d4835b12b40Vendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.16Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux42c9464975cf21346a8950b8ba0ac3234b385be1Vendor (CNA)
Linux Linux4adc4c9a9a43d61fe476dfe10811f3df2e7e4106Vendor (CNA)
Linux Linux76df4edf7d61ecb711bc517ff4c20a5e85c4e9f7Vendor (CNA)
Linux Linux7f740664aec1f832953c2e6d9b8920cd6c8bcc0cVendor (CNA)
Linux Linuxb9c6d048bdfaae78d7d921b454f7de7baefaa2f0Vendor (CNA)
Linux Linuxcbd9583bb6f70733d0022a66d3546a15c76ae744Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.105-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records