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NVD / CVE Program· CNA Linux

CVE-2026-68131: rbd: Reset positive result codes to zero in object map update path

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 14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b, 2419aa74081007dc4d14ff5640659052dfdfd69a, 34f2a2f32af570dfcc532ad70c080629ee1c32b0; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b, 2419aa74081007dc4d14ff5640659052dfdfd69a, 34f2a2f32af570dfcc532ad70c080629ee1c32b0; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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: rbd: Reset positive result codes to zero in object map update path In a reply message to an RBD request, a positive result code indicates a data payload, which is not allowed for writes. While rbd_osd_req_callback() already resets a positive result code for writes to zero, rbd_object_map_callback() does not. This allows a corrupted reply to an object map update to trigger the rbd_assert(*result < 0) in __rbd_obj_handle_request(). This happens, because rbd_object_map_callback() calls rbd_obj_handle_request() -> __rbd_obj_handle_request() and passes this positive result code. From __rbd_obj_handle_request(), rbd_obj_advance_write() is called, which leaves the positive result code unchanged and returns true. Therefore, the if(done && *result) branch is executed in __rbd_obj_handle_request() and the assertion triggers. This patch fixes the issue by adjusting the logic in the rbd_object_map_callback() path. A positive result code for an object map update is now reset to zero (similar to rbd_osd_req_callback()), and the message is subsequently handled the same way as if the result code was zero from the beginning. Additionally, a WARN_ON_ONCE() is added for this case.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 10, 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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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

    • 5.3affected
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before cf1167292f606deaddac35ec384eba48f08a68d2affected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before da926959bf791441ba06a80571708c3d0d3cc08faffected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before 6f33d9d539fb94e5a17589c2dfe271ff9bb64904affected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before 14995c4250f04b58bf6fc00e0e973a2e1b3cfb9baffected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before 2419aa74081007dc4d14ff5640659052dfdfd69aaffected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before 34f2a2f32af570dfcc532ad70c080629ee1c32b0affected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before b1a61366933224b3ad80975c4d01ac2cc6931ecfaffected · git
    • 22e8bd51bb0469d1a524130a057f894ff632376a and later · before a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4affected · git
    • before 5.3not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

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-2026-68128Aug 10, 2026 · ice: reject out-of-range ptype in ice_parser_profile_init
    35Monitor
  • ← EarlierCVE-2026-68129Aug 10, 2026 · gve: fix Rx queue stall on alloc failure
    30Monitor
  • Later →CVE-2026-68132Aug 10, 2026 · super: fix emergency thaw deadlock on frozen block devices
    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 Linux14995c4250f04b58bf6fc00e0e973a2e1b3cfb9bVendor (CNA)
Linux Linux2419aa74081007dc4d14ff5640659052dfdfd69aVendor (CNA)
Linux Linux34f2a2f32af570dfcc532ad70c080629ee1c32b0Vendor (CNA)
Linux Linux6f33d9d539fb94e5a17589c2dfe271ff9bb64904Vendor (CNA)
Linux Linuxa6c4250b81bd30beae94e1b7a4b26fa1193ad2e4Vendor (CNA)
Linux Linuxb1a61366933224b3ad80975c4d01ac2cc6931ecfVendor (CNA)
Linux Linuxcf1167292f606deaddac35ec384eba48f08a68d2Vendor (CNA)
Linux Linuxda926959bf791441ba06a80571708c3d0d3cc08fVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~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.

  • CVE-2026-681540 days apartlibceph: reject zero bucket types in crush_decode
    39Monitor
  • CVE-2026-684775 days apartipvs: fix more places with wrong ipv6 transport offsets
    39Monitor
  • CVE-2026-720655 days apartnet: mana: Validate the packet length reported by the NIC
    39Monitor
  • CVE-2026-9999966 days apartipv4: validate checksum_start before completing checksum
    37Monitor
  • CVE-2026-681990 days apartwifi: ath6kl: fix OOB access from firmware ADDBA window size
    35Monitor
  • CVE-2026-684543 days apartKVM: s390: pci: Fix handling of AIF enable without AISB
    35Monitor

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

  • 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-20 · Improper Input Validation

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.

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