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CVE

CVE-2026-68154

libceph: reject zero bucket types in crush_decode
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CVE

CVE-2026-68154

libceph: reject zero bucket types in crush_decode

In the Linux kernel, the following vulnerability has been resolved:

libceph: reject zero bucket types in crush_decode

CRUSH bucket type 0 is reserved for devices.  The mapper relies on

that invariant and uses type 0 to identify leaf devices.

If crush_decode() accepts a bucket with type 0, a malformed CRUSH map

can make the mapper treat a negative bucket ID as a device and pass it

to is_out(), which then indexes the OSD weight array with a negative

value.

Reject zero bucket types while decoding the CRUSH map so the invalid

state never reaches the mapper.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/05f90284223381005d6bcddab3fda4a97f9c3401, https://git.kernel.org/stable/c/146461f09565afe3665e65b0423d3d6b0fe806c5, https://git.kernel.org/stable/c/3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56, https://git.kernel.org/stable/c/70998f91030ee083ecb336a1dff0701c20a38081, https://git.kernel.org/stable/c/80fc40e11cda1b5d990a3f69c6efa344fb5cd987, https://git.kernel.org/stable/c/826cd1de5802fd392922785f9b64d76e65d2a100, https://git.kernel.org/stable/c/952ca5dc99913d169263f59fd689f586729a13c1, https://git.kernel.org/stable/c/b8a9fb6bf806f9c4891e71ae1beab0c07c23a877, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68154.json, https://nvd.nist.gov/vuln/detail/CVE-2026-68154, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00704%
EPSS Percentile
0.50638%
Introduced Version
f24e9980eb860d8600cbe5ef3d2fd9295320d229,2.6.34,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
05f90284223381005d6bcddab3fda4a97f9c3401,5.10.265,5.15.216,6.1.183,6.6.148,6.12.101,6.18.42,7.1.6,6.12.101-1~deb12u1,6.12.101-1

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