CVE-2026-43304

libceph: define and enforce CEPH_MAX_KEY_LEN

State: Published
Severity: 9.8 Critical
Published: May 8, 2026
Updated: Oct 19, 2026
Reserved: May 1, 2026

Description

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

libceph: define and enforce CEPH_MAX_KEY_LEN

When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length.

The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
LinuxLinux	cd1a677cad994021b19665ed476aea63f5d54f31 to before 6405e8c680974bb74e2c98d5249fb52c7b12a6c6Affected cd1a677cad994021b19665ed476aea63f5d54f31 to before 8d745d38c88ecbed95f6b2b39857bf89f35a3244Affected cd1a677cad994021b19665ed476aea63f5d54f31 to before e1dc45d97975f9db65694d234fbddf1915176e16Affected cd1a677cad994021b19665ed476aea63f5d54f31 to before 1b275bd49e58752efb83767a5d1aed41356c5e64Affected cd1a677cad994021b19665ed476aea63f5d54f31 to before c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931edAffected cd1a677cad994021b19665ed476aea63f5d54f31 to before d82467c07b03a27c3c5469b62bb3b726305a80bbAffected cd1a677cad994021b19665ed476aea63f5d54f31 to before ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bfAffected
LinuxLinux	5.11Affected before 5.11Not affected 5.15.202 through 5.15.Not affected 6.1.165 through 6.1.Not affected 6.6.128 through 6.6.Not affected 6.12.75 through 6.12.Not affected 6.18.16 through 6.18.Not affected 6.19.6 through 6.19.Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

cd1a677cad994021b19665ed476aea63f5d54f31 to before 6405e8c680974bb74e2c98d5249fb52c7b12a6c6Affected
cd1a677cad994021b19665ed476aea63f5d54f31 to before 8d745d38c88ecbed95f6b2b39857bf89f35a3244Affected
cd1a677cad994021b19665ed476aea63f5d54f31 to before e1dc45d97975f9db65694d234fbddf1915176e16Affected
cd1a677cad994021b19665ed476aea63f5d54f31 to before 1b275bd49e58752efb83767a5d1aed41356c5e64Affected
cd1a677cad994021b19665ed476aea63f5d54f31 to before c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931edAffected
cd1a677cad994021b19665ed476aea63f5d54f31 to before d82467c07b03a27c3c5469b62bb3b726305a80bbAffected
cd1a677cad994021b19665ed476aea63f5d54f31 to before ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bfAffected

LinuxLinux

5.11Affected
before 5.11Not affected
5.15.202 through 5.15.*Not affected
6.1.165 through 6.1.*Not affected
6.6.128 through 6.6.*Not affected
6.12.75 through 6.12.*Not affected
6.18.16 through 6.18.*Not affected
6.19.6 through 6.19.*Not affected
7.0 and laterNot affected

References

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