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CVE-2026-127030

Freeradius: stack buffer overflow via unchecked eap-fast sessionticket length

A flaw was found in freeradius. An improper length validation in the EAP-FAST module allows a stack-based buffer overflow during session ticket processing. A remote, unauthenticated attacker can exploit this flaw by sending a specially crafted handshake request, causing the server process to crash and resulting in a Denial of Service (DoS).

CVSS 3.1 · 7.5 High EPSS n/a KEV · Not listed
Vendors
Freeradius Red Hat Redhat
Products
Freeradius Enterprise Linux Enterprise Linux and 1 more
CVE-2026-127099

Sssd: sssd: stack buffer overflow during rsa certificate-to-ssh key conversion

A flaw was found in SSSD's conversion of X.509 certificate RSA public keys to SSH keys. Missing size checks before copying RSA components into fixed-size stack buffers can cause a stack buffer overflow. An attacker able to supply a certificate with oversized RSA components that passes the configured certificate checks can cause denial of service and corrupt SSH responder memory.

CVSS 3.1 · 5.9 Medium EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat Sssd
Products
Enterprise Linux Enterprise Linux Openshift and 3 more
CVE-2026-18379

Yggdrasil-worker-package-manager: yggdrasil-worker-package-manager: path traversal via unsanitized repo name in addrepo/removerepo

A flaw was found in yggdrasil-worker-package-manager. An authenticated attacker can exploit this issue to achieve arbitrary file modification or potential privilege escalation. The vulnerability exists because repository management operations fail to sanitize directory traversal sequences (such as '../') within repository names. By supplying a crafted repository name, an attacker can manipulate the root-level worker process into creating or deleting files outside the intended directory, compromising host system integrity.

CVSS 3.1 · 8.8 High EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux
CVE-2026-126644

Ansible.posix: authorized_key module follows a parent-directory symlink allowing writes outside the intended directory

A link-following flaw was found in the authorized_key module of the ansible.posix collection, residual to the fix for CVE-2026-11837. That fix guards only the final path component (os.chown with follow_symlinks=False and O_NOFOLLOW in _safe_open_write()). When an unprivileged local user replaces their ~/.ssh directory with a symlink to a directory they do not own, and an operator subsequently runs the authorized_key task as root (a common provisioning pattern), the module resolves its path operations through the symlink: atomic_move() writes the temporary file in the symlink target and renames it to <target>/authorized_keys, creating or overwriting a file in the attacker-chosen directory, and os.chmod(sshdir, 0o700) follows the symlink and changes the target directory's permissions. The written file is chowned to the unprivileged user, so this is not a privilege escalation, but it allows an attacker to create or overwrite files (for example in /etc/apt/apt.conf.d/, which APT reads regardless of file ownership) to cause integrity and availability impacts.

CVSS 3.1 · 3.9 Low EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux
CVE-2026-121876

Sandboxed-containers: kernel: systemd-gpt-auto-generator: guest data leakage in confidential computing (sandboxed containers)

A flaw was found in the interaction between systemd-gpt-auto-generator and confidential computing guest VM images in OpenShift Sandboxed Containers (confidential peer pods). systemd-gpt-auto-generator automatically discovers and mounts GPT partitions by type GUID at boot with no user confirmation. In the confidential computing threat model, where the host/hypervisor is the adversary, a malicious host can inject partitions into the guest's virtual disk. Most critically, injecting a swap partition causes the guest kernel to page out TEE-encrypted memory to a host-controlled block device, breaking the confidentiality guarantee of the hardware TEE (AMD SEV-SNP, Intel TDX). The PodVM images use a GPT-partitioned disk with dm-verity on the root partition. However, the roothash= kernel parameter only disables root auto-discovery — non-root partitions (swap, /home, /var, /srv, /var/tmp) are still auto-discovered and mounted. The generator is shipped unmasked in the RHEL systemd-udev subpackage, and no kernel command line parameter in the measured UKI addon disables it. Additionally, the PodVM measurement script captures PCRs 3, 9, 11, and 12, but not PCR 5 (GPT partition table), so partition table modifications are not detected by remote attestation.

CVSS 3.1 · 7.9 High EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Openshift and 2 more
CVE-2026-115456

Gcc: out-of-bounds read in std::from_chars

A flaw was found in gcc. An attacker could cause a Denial of Service (DoS) by passing a string that is not null-terminated to the std::from_chars() function in the libstdc++ library. This issue triggers an out-of-bounds read beyond the allocated buffer, potentially leading to invalid data parsing or an application crash.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Gcc Red Hat Redhat
Products
Gcc Enterprise Linux Enterprise Linux and 6 more
CVE-2026-115455

Gcc: stack overflow in std::bitset on libstdc++

A flaw was found in GCC libstdc++. When an application extracts data into a bitset from a wide-character stream, internal stack memory allocation fails to properly account for character size and alignment. An attacker capable of supplying crafted input to an affected application could trigger a stack-based buffer overflow leading denial of service (DoS).

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Gcc Red Hat Redhat
Products
Gcc Enterprise Linux Enterprise Linux and 5 more
CVE-2026-114691

Gcc: integer wrap in `std

A flaw was found in the libstdc++ component of GCC. An attacker who can provide an excessively large element count to a boolean vector (std::vector<bool>) constructor can trigger an integer wrap during internal memory calculations. This issue leaves the container in an inconsistent state, leading to out-of-bounds memory access and resulting in an application crash or a Denial of Service (DoS) during subsequent operations.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Gcc Red Hat Redhat
Products
Gcc Enterprise Linux Enterprise Linux and 6 more
CVE-2026-114690

Gcc: confirmed out-of-bounds read/write in libstdc++ parallel `std

A flaw was found in GCC. An out-of-bounds memory access vulnerability exists in the libstdc++ parallel search implementation due to an undersized internal buffer. A local attacker can exploit this flaw by providing crafted search data to an application compiled with parallel mode, causing the process to crash and leading to a Denial of Service (DoS).

CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed
Vendors
Gcc Red Hat Redhat
Products
Gcc Enterprise Linux Enterprise Linux and 6 more
CVE-2026-124745

Busybox: tar deferred hardlink target resolved through a deferred symlink escapes the extraction directory

A flaw was found in BusyBox. When extracting an archive, the tar utility improperly resolves deferred hardlink targets across symbolic links pointing outside the intended extraction directory. An attacker could provide a specially crafted archive that links to sensitive files outside the extraction tree, allowing subsequent extraction operations to overwrite arbitrary files on the system.

CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Busybox Red Hat Redhat
Products
Busybox Enterprise Linux Enterprise Linux and 3 more
CVE-2026-127029

Freeradius: stack-based buffer overflow via unbounded eap-sim identity length

A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).

CVSS 3.1 · 7.5 High EPSS n/a KEV · Not listed
Vendors
Freeradius Red Hat Redhat
Products
Freeradius Enterprise Linux Enterprise Linux and 1 more
CVE-2026-127100

Sssd: sssd: local denial of service through unchecked oauth2 json code type in pam responder

A flaw was found in SSSD's PAM responder on builds with the JSON PAM extension enabled. A local attacker can submit a crafted authentication request containing a non-string OAuth2 code value. Missing JSON type validation leads to a NULL pointer dereference, terminating the PAM responder and disrupting SSSD-backed authentication.

CVSS 3.1 · 5.5 Medium EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat Sssd
Products
Enterprise Linux Enterprise Linux Openshift and 3 more
CVE-2026-126831

Cpio: cpio: stack-based buffer overflow in write_out_tar_header() with long usernames/groupnames

A flaw was found in cpio. A local user can cause a Denial of Service (DoS) by triggering a stack-based buffer overflow when creating archives in tar or ustar formats. When archiving files owned by users or groups with names exceeding 32 characters, cpio copies these names into fixed-size memory without verifying their length. This unbounded copy corrupts stack memory and causes the application to crash.

CVSS 3.1 · 5.5 Medium EPSS n/a KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Hardened Images and 2 more
CVE-2026-42784

Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion

A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat Sequoia-pgp
Products
Enterprise Linux Ansible Automation Platform Ansible Automation Platform Developer and 15 more
CVE-2026-112314

Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries

clnttcp_call() in lib/rpc/clnt_tcp.c in MIT Kerberos 5 (aka krb5) does not free the RPC reply verifier between retries, which allows remote attackers to cause a denial of service (memory leak in GSS-RPC client programs) by injecting RPC replies with mismatched XIDs or by triggering authentication retries.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Enterprise Linux Eus and 4 more
CVE-2026-119079

Krb5: mit krb5 kdc unauthenticated cpu dos via quadratic asn.1 sequence of decoding

decode_sequence_of() in lib/krb5/asn.1/asn1_encode.c in MIT Kerberos 5 (aka krb5) 1.11 and later grows the decoded element array one entry at a time, which allows remote attackers to cause a denial of service (CPU consumption in the KDC) by sending an unauthenticated AS-REQ or TGS-REQ with a large number of elements in a SEQUENCE OF field over TCP.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Enterprise Linux Eus and 4 more
CVE-2026-112323

Krb5: mit krb5 kadmind unauthenticated memory exhaustion via failed auth_gssapi_init requests

The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) 1.5.2 and later allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by sending repeated failed AUTH_GSSAPI_INIT requests. Each failed request allocates client state that is only freed after a 15-minute expiration timeout, allowing an attacker to accumulate memory faster than it is reclaimed.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Enterprise Linux Eus and 4 more
CVE-2026-112322

Krb5: mit krb5 kadmind unauthenticated cpu dos via auth_gssapi client states cleanup

clean_client() in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) restarts its scan from the head of the client list after each removal, resulting in quadratic CPU cost. Remote attackers can cause a denial of service (CPU consumption in kadmind) by accumulating a large number of AUTH_GSSAPI client entries.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Enterprise Linux Eus and 4 more
CVE-2026-112321

Krb5: mit krb5 kadmind unauthenticated memory leak dos via auth_gssapi_init error paths

The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) does not free decoded arguments on certain error paths, which allows remote attackers to cause a denial of service (memory exhaustion in kadmind) via crafted AUTH_GSSAPI_INIT requests that trigger authentication failures.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Enterprise Linux Eus and 4 more
CVE-2026-112320

Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching

The GSS-RPC transport layer in MIT Kerberos 5 (aka krb5) 1.4 and later does not release the previous authentication context when a client switches from an RPCSEC_GSS or AUTH_GSSAPI flavor to a non-GSS flavor on the same TCP connection. This allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by repeatedly establishing and abandoning GSS authentication contexts.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Enterprise Linux Eus and 4 more