Answer in brief
CVE-2026-43304 records a Critical severity (CVSS 9.8) vulnerability in libceph: define and enforce CEPH_MAX_KEY_LEN. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cd1a677cad994021b19665ed476aea63f5d54f31 <6405e8c680974bb74e2c98d5249fb52c7b12a6c6 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <8d745d38c88ecbed95f6b2b39857bf89f35a3244 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <e1dc45d97975f9db65694d234fbddf1915176e16 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <1b275bd49e58752efb83767a5d1aed41356c5e64 || >=cd1a677cad994021b19665ed476aea63f5d54f31 <c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed || >=cd1a677cad994021b19665ed476aea63f5d54f31 <d82467c07b03a27c3c5469b62bb3b726305a80bb || >=cd1a677cad994021b19665ed476aea63f5d54f31 <ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf | 6405e8c680974bb74e2c98d5249fb52c7b12a6c6, 8d745d38c88ecbed95f6b2b39857bf89f35a3244, e1dc45d97975f9db65694d234fbddf1915176e16, 1b275bd49e58752efb83767a5d1aed41356c5e64, c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed, d82467c07b03a27c3c5469b62bb3b726305a80bb, ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf |
| Linux/Linuxgeneric | 5.11 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.