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NVD / CVE Program· CNA Linux

CVE-2026-52954: libceph: handle rbtree insertion error in decode_choose_args()

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.52% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3, 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da, 4d2b37abda9536808655830d683dc491d31741a8.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3, 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da, 4d2b37abda9536808655830d683dc491d31741a8 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: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]

Published
Jun 24, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 44th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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Follow CVE-2026-52954

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  • 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

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

    • 4.13affected
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before c7bf7864e2924fa5508ac270b0e9364bc13d5a6caffected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before f47430fc1f815e87406e2d3b4e476eff1bc7fd9baffected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9daaffected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before 534ebc08df97c47d4c7596f336fa31ecbf91519caffected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before 80c73bd1b2b04355d1d0c29be8ccbd25a380905daffected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before 4d2b37abda9536808655830d683dc491d31741a8affected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3affected · git
    • 5cf9c4a9959b6273675310d14a834ef14fbca37c and later · before d289478cfc0bcf81c7914200d6abdcb78bd04dedaffected · git
    • before 4.13not affected · semver
Affected versions · NVD (8)

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

  • linux linux kernel4.13 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.141
  • linux linux kernel6.7 and later · before 6.12.91
  • linux linux kernel6.13 and later · before 6.18.33
  • linux linux kernel6.19 and later · before 7.0.10
  • linux linux kernel7.1

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.10-17.0.10-1

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-2026-52951Jun 24, 2026 · drm/xe/dma-buf: handle empty bo and UAF races
    31Monitor
  • ← EarlierCVE-2026-52953Jun 24, 2026 · iommu/vt-d: Fix oops due to out of scope access
    28Monitor
  • Later →CVE-2026-52955Jun 24, 2026 · libceph: Fix potential out-of-bounds access in crush_decode()
    39Monitor

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 Linux0a1265a9ab875f92b6a3ffb497404f46cf9d76a3Vendor (CNA)
Linux Linux0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9daVendor (CNA)
Linux Linux4d2b37abda9536808655830d683dc491d31741a8Vendor (CNA)
Linux Linux534ebc08df97c47d4c7596f336fa31ecbf91519cVendor (CNA)
Linux Linux80c73bd1b2b04355d1d0c29be8ccbd25a380905dVendor (CNA)
Linux Linuxc7bf7864e2924fa5508ac270b0e9364bc13d5a6cVendor (CNA)
Linux Linuxd289478cfc0bcf81c7914200d6abdcb78bd04dedVendor (CNA)
Linux Linuxf47430fc1f815e87406e2d3b4e476eff1bc7fd9bVendor (CNA)
debian:linux6.1.176-1 · 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.

Variant candidates

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

  • CVE-2026-529520 days apartiommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset
    35Monitor
  • CVE-2026-3173954 days apartcrypto: tegra - Add missing CRYPTO_ALG_ASYNC
    35Monitor
  • CVE-2026-4611727 days apartRDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss()
    31Monitor
  • CVE-2026-3139882 days apartmm/rmap: fix incorrect pte restoration for lazyfree folios
    31Monitor
  • CVE-2025-39803282 days apartscsi: ufs: core: Remove WARN_ON_ONCE() call from ufshcd_uic_cmd_compl()
    31Monitor
  • CVE-2026-4602728 days apartnet/smc: avoid early lgr access in smc_clc_wait_msg
    30Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-617 · Reachable Assertion

CVSS vector

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

nvd-secondary

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.

References

Show all references (7 more)

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

All records