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CVE Record

CVE-2026-22990: libceph: replace overzealous BUG_ON in osdmap_apply_incremental()

In the Linux kernel, the following vulnerability has been resolved: libceph: replace overzealous BUG_ON in osdmap_apply_incremental() If the osdmap is (maliciously) corrupted such that the incremental osdmap epoch is different from what is expected, there is no need to BUG. Instead, just declare the incremental osdmap to be invalid.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can turn a malformed Ceph OSD map update into a system crash. The business risk is service outage, not data theft. It matters most for servers using kernel Ceph clients such as CephFS or RBD.

Executive priority

Treat as high priority for production Ceph-backed workloads because exploitation could cause host outages. Deprioritize only after confirming Ceph kernel client code is not used.

Technical view

libceph used BUG_ON in osdmap_apply_incremental() when an incremental osdmap epoch differed from expectation. The fix treats the incremental osdmap as invalid instead of triggering a kernel BUG. CVSS 7.5 reflects remote, unauthenticated availability impact, with no stated confidentiality or integrity impact.

Likely exposure

Exposure is most likely on Linux systems that use libceph-backed storage paths, including kernel Ceph client deployments. Systems not using Ceph kernel functionality are less likely to be reachable through this code path.

Exploitation context

The source describes a maliciously corrupted osdmap causing the condition. KEV is false, and the bundle provides no evidence of active exploitation or public weaponization.

Researcher notes

The source bundle does not define attacker placement beyond network CVSS and malicious osdmap corruption. Validate affectedness through kernel source/package lineage rather than product names inferred outside the record.

Mitigation direction

  • Apply a Linux vendor kernel update containing the cited libceph stable fixes.
  • Prioritize CephFS, RBD, and other kernel Ceph client hosts.
  • Restrict Ceph network access to trusted cluster endpoints where operationally possible.
  • Check distribution advisories for exact fixed kernel package versions.

Validation and detection

  • Inventory Linux hosts using CephFS, RBD, or loaded libceph-related kernel modules.
  • Compare running kernel versions against distribution advisories and fixed package metadata.
  • Confirm patched kernels include the referenced libceph osdmap_apply_incremental() change.
  • Review outage logs for kernel BUG or panic events involving libceph osdmap handling.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2026-22990 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
0ADP providers
8Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-22990Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxf24e9980eb860d8600cbe5ef3d2fd9295320d229, f24e9980eb860d8600cbe5ef3d2fd9295320d229, f24e9980eb860d8600cbe5ef3d2fd9295320d229, f24e9980eb860d8600cbe5ef3d2fd9295320d229, f24e9980eb860d8600cbe5ef3d2fd9295320d229, f24e9980eb860d8600cbe5ef3d2fd9295320d229, f24e9980eb860d8600cbe5ef3d2fd9295320d229unaffected
LinuxLinux2.6.34, 0, 5.10.248, 5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6, 6.19affected
Weakness

CWE details

No CWE listed

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