CVE-2026-43304
published 2026-05-08CVE-2026-43304: 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…
PriorityP351critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.50%
39.6th percentile
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.
Affected
60 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < 6405e8c680974bb74e2c98d5249fb52c7b12a6c6 | 6405e8c680974bb74e2c98d5249fb52c7b12a6c6 |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < 8d745d38c88ecbed95f6b2b39857bf89f35a3244 | 8d745d38c88ecbed95f6b2b39857bf89f35a3244 |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < e1dc45d97975f9db65694d234fbddf1915176e16 | e1dc45d97975f9db65694d234fbddf1915176e16 |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < 1b275bd49e58752efb83767a5d1aed41356c5e64 | 1b275bd49e58752efb83767a5d1aed41356c5e64 |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed | c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < d82467c07b03a27c3c5469b62bb3b726305a80bb | d82467c07b03a27c3c5469b62bb3b726305a80bb |
| linux | linux | >= cd1a677cad994021b19665ed476aea63f5d54f31 < ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf | ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.11 < 5.15.202 | 5.15.202 |
| linux | linux_kernel | >= 5.16 < 6.1.165 | 6.1.165 |
| linux | linux_kernel | >= 6.13 < 6.18.16 | 6.18.16 |
| linux | linux_kernel | >= 6.19 < 6.19.6 | 6.19.6 |
| linux | linux_kernel | >= 6.2 < 6.6.128 | 6.6.128 |
| linux | linux_kernel | >= 6.7 < 6.12.75 | 6.12.75 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-5.15 | — | — |
| ubuntu | linux-azure-fde-5.15 | — | — |
| ubuntu | linux-azure-fips | — | — |
| ubuntu | linux-fips | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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- IOMMU subsystem;
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- NVME drivers;
- x86 platform drivers;
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- SPI subsystem;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
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Linux kernel vulnerabilities
vendor_ubuntu·2026-07-01·CVSS 7.1
CVE-2026-43304 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
- Scatterlist API;
- B.A.T.M.A.N. meshing protocol;
- Ethernet br
Red Hat
kernel: libceph: define and enforce CEPH_MAX_KEY_LEN
vendor_redhat·2026-05-08·CVSS 7.0
CVE-2026-43304 [HIGH] CWE-1284 kernel: libceph: define and enforce CEPH_MAX_KEY_LEN
kernel: libceph: define and enforce CEPH_MAX_KEY_LEN
A flaw was found in the `libceph` component of the Linux kernel. This vulnerability occurs when the kernel processes authentication keys, specifically in the `process_auth_done()` function, where it fails to properly enforce a maximum length for key material. An attacker could exploit this by providing an overly long key, potentially leading to a buffer overflow. This could result in a denial of service (DoS) or other unpredictable system behavior.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Affected
Package: kernel (Red Hat Enterprise Linux 8) - Affected
VulDB
Linux Kernel up to 6.19.5 libceph process_auth_done buffer overflow
vuldb·2026-05-18·CVSS 9.8
CVE-2026-43304 [CRITICAL] Linux Kernel up to 6.19.5 libceph process_auth_done buffer overflow
A vulnerability has been found in Linux Kernel up to 6.19.5 and classified as critical. The affected element is the function process_auth_done of the component libceph. This manipulation causes buffer overflow.
This vulnerability is handled as CVE-2026-43304. The attack can only be done within the local network. There is not any exploit available.
The affected component should be upgraded.
GHSA
GHSA-h4fr-xr6m-wwp8: In the Linux kernel, the following vulnerability has been resolved:
libceph: define and enforce CEPH_MAX_KEY_LEN
When decoding the key, verify that
ghsa_unreviewed·2026-05-08
CVE-2026-43304 GHSA-h4fr-xr6m-wwp8: In the Linux kernel, the following vulnerability has been resolved:
libceph: define and enforce CEPH_MAX_KEY_LEN
When decoding the key, verify that
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.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/1b275bd49e58752efb83767a5d1aed41356c5e64https://git.kernel.org/stable/c/6405e8c680974bb74e2c98d5249fb52c7b12a6c6https://git.kernel.org/stable/c/8d745d38c88ecbed95f6b2b39857bf89f35a3244https://git.kernel.org/stable/c/ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bfhttps://git.kernel.org/stable/c/c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931edhttps://git.kernel.org/stable/c/d82467c07b03a27c3c5469b62bb3b726305a80bbhttps://git.kernel.org/stable/c/e1dc45d97975f9db65694d234fbddf1915176e16
2026-05-08
Published