CVE-2026-68131 - Vulnerability Details

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

Description

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.

Published: 2026-08-10

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability resides in the Linux kernel's RBD (RADOS Block Device) subsystem, specifically in the object‑map update callback path. A positive result code in a reply to an object‑map update is incorrectly propagated through to the request handler without being reset to zero. This triggers an assertion in the kernel that is meant to catch negative error codes, causing the kernel to panic. The flaw involves improper handling of result codes (CWE-617), leading to an immediate loss of availability for the node hosting the kernel.

Affected Systems

All Linux kernel installations that ship the RBD module enabled are affected. Any distribution that includes the default kernel with RBD support, regardless of Ceph configuration, can experience this flaw if an attacker can influence the content of an object‑map reply.

Risk and Exploitability

The CVSS score is 7.5, indicating a high‑level severity. The EPSS score is < 1%, which represents a very low but nonzero exploitation probability. The vulnerability is not listed in the CISA KEV catalog. The flaw leads to a complete denial of service on the compromised host. An attacker must be able to supply a malformed RBD reply, which typically requires control over a Ceph OSD or the ability to tamper with network traffic between client and OSD. This inferred attack vector limits widespread exploitation, but the high impact of a kernel crash warrants immediate patching when updates are available.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< cf1167292f606deaddac35ec384eba48f08a68d2
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< da926959bf791441ba06a80571708c3d0d3cc08f
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< 6f33d9d539fb94e5a17589c2dfe271ff9bb64904
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< 14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< 2419aa74081007dc4d14ff5640659052dfdfd69a
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< 34f2a2f32af570dfcc532ad70c080629ee1c32b0
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< b1a61366933224b3ad80975c4d01ac2cc6931ecf
`22e8bd51bb0469d1a524130a057f894ff632376a`	affected	< a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4

Linux

affected

Version	Status	Constraints
`5.3`	affected	—
`0`	unaffected	< 5.3
`5.10.265`	unaffected	≤ 5.10.*
`5.15.216`	unaffected	≤ 5.15.*
`6.1.183`	unaffected	≤ 6.1.*
`6.6.148`	unaffected	≤ 6.6.*
`6.12.101`	unaffected	≤ 6.12.*
`6.18.42`	unaffected	≤ 6.18.*
`7.1.6`	unaffected	≤ 7.1.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[22e8bd51bb0469d1a524130a057f894ff632376a,14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b)`	affected	code_commit	—
`[22e8bd51bb0469d1a524130a057f894ff632376a,2419aa74081007dc4d14ff5640659052dfdfd69a)`	affected	code_commit	—
`[22e8bd51bb0469d1a524130a057f894ff632376a,34f2a2f32af570dfcc532ad70c080629ee1c32b0)`	affected	code_commit	—
`[22e8bd51bb0469d1a524130a057f894ff632376a,a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4)`	affected	code_commit	—
`[22e8bd51bb0469d1a524130a057f894ff632376a,b1a61366933224b3ad80975c4d01ac2cc6931ecf)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`5.3`	affected	generic	—
`[0,5.3)`	unaffected	generic	—
`[6.6.148,6.7.0)`	unaffected	semver	—
`[6.12.101,6.13.0)`	unaffected	semver	—
`[6.18.42,6.19.0)`	unaffected	semver	—
`[7.1.6,7.2.0)`	unaffected	semver	—
`[7.2-rc5,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Update the kernel to a version that incorporates the rbd_object_map_callback fix commit referenced in the supplied Git commits.
If a direct kernel upgrade is not feasible, backport the specific changes from those commits to the running kernel under development.
If patching or backporting is impossible, isolate the host from the Ceph cluster or restrict the network path to trusted nodes and monitor for anomalous RBD traffic.

Generated by OpenCVE AI on August 14, 2026 at 03:49 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4745-1	linux-6.12 security update

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0053.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b
https://git.kernel.org/stable/c/2419aa74081007dc4d14ff5640659052dfdfd69a
https://git.kernel.org/stable/c/34f2a2f32af570dfcc532ad70c080629ee1c32b0
https://git.kernel.org/stable/c/6f33d9d539fb94e5a17589c2dfe271ff9bb64904
https://git.kernel.org/stable/c/a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4
https://git.kernel.org/stable/c/b1a61366933224b3ad80975c4d01ac2cc6931ecf
https://git.kernel.org/stable/c/cf1167292f606deaddac35ec384eba48f08a68d2
https://git.kernel.org/stable/c/da926959bf791441ba06a80571708c3d0d3cc08f
https://nvd.nist.gov/vuln/detail/CVE-2026-68131
https://www.cve.org/CVERecord?id=CVE-2026-68131

History

Wed, 19 Aug 2026 16:45:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/6f33d9d539fb94e5a17589c2dfe271ff9bb64904 https://git.kernel.org/stable/c/cf1167292f606deaddac35ec384eba48f08a68d2 https://git.kernel.org/stable/c/da926959bf791441ba06a80571708c3d0d3cc08f

Fri, 14 Aug 2026 02:15:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-598 CWE-703

Thu, 13 Aug 2026 22:45:00 +0000

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Wed, 12 Aug 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-617
References		https://nvd.nist.gov/vuln/detail/CVE-2026-68131 https://www.cve.org/CVERecord?id=CVE-2026-68131
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Mon, 10 Aug 2026 19:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-598 CWE-703

Mon, 10 Aug 2026 12:30:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		rbd: Reset positive result codes to zero in object map update path
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b https://git.kernel.org/stable/c/2419aa74081007dc4d14ff5640659052dfdfd69a https://git.kernel.org/stable/c/34f2a2f32af570dfcc532ad70c080629ee1c32b0 https://git.kernel.org/stable/c/a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4 https://git.kernel.org/stable/c/b1a61366933224b3ad80975c4d01ac2cc6931ecf

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-10T11:58:54.155Z

Updated: 2026-08-19T16:29:49.752Z

Reserved: 2026-07-30T09:28:09.370Z

Link: CVE-2026-68131

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-08-10T13:19:58.460

Modified: 2026-08-19T17:20:30.607

Link: CVE-2026-68131

Redhat

Severity : Moderate

Publid Date: 2026-08-10T11:58:54Z

Links: CVE-2026-68131 - Bugzilla

OpenCVE Enrichment

Updated: 2026-08-14T04:00:12Z

Weaknesses

CWE-617
Reachable Assertion

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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