advisories

LinnemanLabs Research and Advisories Security research, advisories, and proof-of-concept code from LinnemanLabs. Advisories and Research Links to write-ups, disclosures, and reproducible PoCs. Project| Findings / Techniques| CVEs| Result| Write-up| PoC ---|---|---|---|---|--- bluez| ?| ?| LPE to...

CVE-2026-90067

A flaw was found in the Linux kernel's libceph component. A remote attacker could exploit this by sending a specially crafted Ceph messenger v2 protocol banner with a zero-length payload. This malformed banner causes the kernel to attempt a zero-length socket read, which violates internal state...

Important: Red Hat Security Advisory: Red Hat Ceph Storage

A new version of Red Hat build of Ceph Storage has been released The Red Hat Storage Ceph container images are based on the latest ubi9 base image and Ceph 8.1. This release updates to the latest version...

Important: Red Hat Security Advisory: Red Hat Ceph Storage 8.1 security and bug fix updates

An update is now available for Red Hat Ceph Storage 8.1. Red Hat Ceph Storage is a scalable, open, software-defined storage platform that combines the most stable version of the Ceph storage system with a Ceph management platform, deployment utilities, and support services. These new packages...

ceph: ceph: RGW STS session tokens vulnerable to CBC bit-flip attack enabling admin privilege escalation

A flaw was found in Ceph RGW's STS Security Token Service session token implementation. The STS tokens use the same unauthenticated AES-128-CBC encryption as CephX, which lacks message authentication and uses a hardcoded initialization vector. Because there is no integrity protection on the token...

ceph: rhceph-container: Authentication bypass in CEPH RadosGW

A vulnerability in the Ceph Rados Gateway RadosGW OIDC provider allows attackers to bypass JWT signature verification by supplying a token with "none" as the algorithm alg. This occurs because the implementation fails to enforce strict signature validation, enabling attackers to forge valid token...

ceph: ceph: RGW SigV4 verifier allows attachment of arbitrary unsigned x-amz-* headers leading to privilege escalation

A flaw was found in Ceph RGW's SigV4 signature verification handler. When processing S3 requests, RGW verifies only the headers explicitly listed in the X-Amz-SignedHeaders field but does not reject requests that carry additional unsigned x-amz- headers. This diverges from the AWS S3 specificatio...

ceph: ceph: MON subscription handler exposes config-key store to low-privilege CephX users

A flaw was found in the MON subscription handler of Ceph, a distributed storage system. The handler does not properly authorize access to the config-key store when processing MMonSubscribe messages. Any CephX user holding mon allow r capabilities can read the entire config-key store, which contai...

kernel: ceph: kernel: Ceph: exploit of hardcoded IVECs, in a misuse of AES, resulting in authentication bypass

A flaw was found in the CephX authentication protocol used by Ceph, a distributed storage system. CephX uses AES-128-CBC encryption with a hardcoded initialization vector and no message authentication HMAC, making it vulnerable to the same class of unauthenticated-encryption attacks that...

Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : Ceph vulnerability (USN-8867-1)

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8867-1 advisory. It was discovered that the Ceph Object Gateway RGW SigV4 handler did not reject requests carrying x-amz- headers that were absent from the...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: libceph: Replace BUGON with a bounds check for map-maxosd. OSD indexes come from untrusted network packets. Boundaries checks are added to validate these against map-maxosd. idryomov: removed BUGON in cephgetprimaryaffinity, mino...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: In libceph, the error from monhandleauthdone should be returned. Currently, any error from cephauthhandlereplydone is propagated via finishauth, but it is not returned from monhandleauthdone. This results in higher layers...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: Ceph: The dadd function only adds entries to negative dentries when they are not already present in the primary dcache hash. Ceph may call dadddentry, NULL on a negative dentry that already exists in the primary dcache hash. This...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: Ceph: Proper snapshot context was provided for the cephzeropartialobject function. The cephzeropartialobject function lacked the correct snapshot context for its OSD write operations, which could lead to inconsistencies in...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: libceph: Defined and enforced the CEPHMAXKEYLEN. When decoding the key, verify that the key material fits into a fixed-size buffer in processauthdone, and that its length is reasonable. The new CEPHMAXKEYLEN check replaces the...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: TCP: The check skb variable is not NULL in tcprtodeltaus. We have some machines running stock Ubuntu 20.04.6; these machines have a kernel version of 5.4.0-174-generic and are running Ceph. Recently, a NULL pointer dereference...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in cephmonmapDecode This patch fixes unnecessary implicit conversions that change the signedness of bloblen and nummon in cephmonmapDecode. Currently, bloblen and nummon are signed int...

Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

In the Linux kernel, the following vulnerability has been resolved: ceph: fixed a deadlock or deadcode issue caused by misuse of dget. The lock order between denty and its parent is incorrect; we should always ensure that the parent gets the lock first. However, since this deadcode is never used,...

Astra Linux – Vulnerability in Ceph

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Astra Linux – Vulnerabilities in Linux, Linux-5.10, Linux-5.15, Linux-6.1

In the Linux kernel, the following vulnerability has been resolved: libceph: fixed a race condition between delayedwork and cephmoncstop The way delayed work is handled in cephmoncstop is prone to races with monfault, and possibly also finishhunting. Both of these can requeue the delayed work,...