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NVD / CVE Program· CNA Linux

CVE-2026-43289: kexec: derive purgatory entry from symbol

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 027797595a108726f4a0a45d225f603b0ffbd22b, 1737d37ae1d2814e6cf0a1af87af3d41f0812b95, 36eb314184a0ae74dd42914b47d2b9fc43be8034.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 027797595a108726f4a0a45d225f603b0ffbd22b, 1737d37ae1d2814e6cf0a1af87af3d41f0812b95, 36eb314184a0ae74dd42914b47d2b9fc43be8034 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: kexec: derive purgatory entry from symbol kexec_load_purgatory() derives image->start by locating e_entry inside an SHF_EXECINSTR section. If the purgatory object contains multiple executable sections with overlapping sh_addr, the entrypoint check can match more than once and trigger a WARN. Derive the entry section from the purgatory_start symbol when present and compute image->start from its final placement. Keep the existing e_entry fallback for purgatories that do not expose the symbol. WARNING: kernel/kexec_file.c:1009 at kexec_load_purgatory+0x395/0x3c0, CPU#10: kexec/1784 Call Trace: <TASK> bzImage64_load+0x133/0xa00 __do_sys_kexec_file_load+0x2b3/0x5c0 do_syscall_64+0x81/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e [me@linux.beauty: move helper to avoid forward declaration, per Baoquan]

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 8, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
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.

Follow CVE-2026-43289

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.19.287 and later · before 4.20
  • linux linux kernel5.4.248 and later · before 5.5
  • linux linux kernel5.10.185 and later · before 5.10.252
  • linux linux kernel5.15.118 and later · before 5.15.202
  • linux linux kernel6.1.35 and later · before 6.1.165
  • linux linux kernel6.3.9 and later · before 6.4
  • linux linux kernel6.4.1 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6
  • linux linux kernel6.4
  • linux linux kernel7.0

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

    • 4947a0eb7d642b6048559857964966016ef3aa8b, b16bf76b382810257e3fb6278663a9d131b70197, cb1638618545182a01444b2b20a4ed6b9d2a8c8f, 6.4affected
    • f368aed4827bd4276c0e3664fb2cb815a8d7caf3 and later · before 027797595a108726f4a0a45d225f603b0ffbd22baffected · git
    • d38e051ec6fd8650b139d9bc4b0b8b261953b263 and later · before 1737d37ae1d2814e6cf0a1af87af3d41f0812b95affected · git
    • 013027918a4efa807409fcb356009c117e4d181a and later · before f736032c638a33a243e9126e617788f763d648f9affected · git
    • 8652d44f466ad5772e7d1756e9457046189b0dfc and later · before cfccd3b8c51bc57a8a6fcb2fd30453afae5bc0d2affected · git
    • 8652d44f466ad5772e7d1756e9457046189b0dfc and later · before 875355152b33436907c2a6d2ffad1431fa86c62baffected · git
    • 8652d44f466ad5772e7d1756e9457046189b0dfc and later · before 36eb314184a0ae74dd42914b47d2b9fc43be8034affected · git
    • 8652d44f466ad5772e7d1756e9457046189b0dfc and later · before 5226570bd252cea2e805a161cb0f75c204c3108aaffected · git
    • 8652d44f466ad5772e7d1756e9457046189b0dfc and later · before 480e1d5c64bb14441f79f2eb9421d5e26f91ea3daffected · git
    • 5.10.185 and later · before 5.10.252affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.6-16.19.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43287May 8, 2026 · drm: Account property blob allocations to memcg
    22Monitor
  • ← EarlierCVE-2026-43288May 8, 2026 · ext4: move ext4_percpu_param_init() before ext4_mb_init()
    22Monitor
  • Later →CVE-2026-43290May 8, 2026 · media: uvcvideo: Return queued buffers on start_streaming() failure
    31Monitor

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 Linux027797595a108726f4a0a45d225f603b0ffbd22bVendor (CNA)
Linux Linux1737d37ae1d2814e6cf0a1af87af3d41f0812b95Vendor (CNA)
Linux Linux36eb314184a0ae74dd42914b47d2b9fc43be8034Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux480e1d5c64bb14441f79f2eb9421d5e26f91ea3dVendor (CNA)
Linux Linux5.10.252Vendor (CNA)
Linux Linux5.15.202Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5226570bd252cea2e805a161cb0f75c204c3108aVendor (CNA)
Linux Linux6.1.165Vendor (CNA)
Linux Linux6.4Vendor (CNA)
Linux Linux875355152b33436907c2a6d2ffad1431fa86c62bVendor (CNA)
Linux Linuxcfccd3b8c51bc57a8a6fcb2fd30453afae5bc0d2Vendor (CNA)
Linux Linuxf736032c638a33a243e9126e617788f763d648f9Vendor (CNA)
debian:linux6.1.170-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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