Threats Tagged 'cve-2026-31402'

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache The NFSv4.0 replay cache uses a fixed 112-byte inline buffer (rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses. This size was calculated based on OPEN responses and does not account for LOCK denied responses, which include the conflicting lock owner as a variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT). When a LOCK operation is denied due to a conflict with an existing lock that has a large owner, nfsd4_encode_operation() copies the full encoded response into the undersized replay buffer via read_bytes_from_xdr_buf() with no bounds check. This results in a slab-out-of-bounds write of up to 944 bytes past the end of the buffer, corrupting adjacent heap memory. This can be triggered remotely by an unauthenticated attacker with two cooperating NFSv4.0 clients: one sets a lock with a large owner string, then the other requests a conflicting lock to provoke the denial. We could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full opaque, but that would increase the size of every stateowner, when most lockowners are not that large. Instead, fix this by checking the encoded response length against NFSD4_REPLAY_ISIZE before copying into the replay buffer. If the response is too large, set rp_buflen to 0 to skip caching the replay payload. The status is still cached, and the client already received the correct response on the original request.

This security advisory from Red Hat addresses multiple vulnerabilities in the Linux kernel live patch module for kernel version 4.18.0-553.53.1.el8_10. The issues include a privilege escalation or denial of service vulnerability in the KVM due to improper shadow page table entry handling (CVE-2026-23401), a heap overflow in the NFSv4.0 LOCK replay cache (CVE-2026-31402), and a use-after-free vulnerability in the bonding driver causing denial of service (CVE-2026-31419). These vulnerabilities have been rated with an overall security impact of Important by Red Hat. Updates are available as kpatch live patch modules to address these issues. The advisory provides detailed package updates and references for remediation.

This advisory addresses multiple security vulnerabilities in the Linux kernel targeted by the kpatch live patch module for kernel-4.18.0-477.97.1.el8_8 on Red Hat Enterprise Linux 8.8. The vulnerabilities include privilege escalation or denial of service in the KVM due to improper shadow page table entry handling (CVE-2026-23401), a heap overflow in the NFSv4.0 LOCK replay cache (CVE-2026-31402), and a use-after-free in the bonding driver causing denial of service (CVE-2026-31419). These issues are rated as important by Red Hat and have corresponding patches available via kpatch modules. The advisory provides instructions for applying these updates to affected systems.

This Red Hat security advisory addresses multiple vulnerabilities in the Linux kernel 5.14.0-284.117.1.el9_2 via live patch modules for kpatch. The issues include a privilege escalation or denial of service vulnerability in the KVM due to improper shadow page table entry handling (CVE-2026-23401), a heap overflow in the NFSv4.0 LOCK replay cache (CVE-2026-31402), and a use-after-free in the bonding driver causing denial of service (CVE-2026-31419). These vulnerabilities affect Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions and Extended Life Cycle versions. The advisory provides updated kpatch modules to remediate these issues. No CVSS scores are provided, but the severity is rated as important/high by Red Hat.

This Red Hat security advisory addresses multiple vulnerabilities in the Linux kernel 5.14.0-427.68.2.el9_4 via kpatch live patch modules. The fixed issues include a privilege escalation or denial of service in KVM due to improper shadow page table entry handling (CVE-2026-23401), a heap overflow in the NFSv4.0 LOCK replay cache (CVE-2026-31402), and a use-after-free vulnerability in the bonding driver causing denial of service (CVE-2026-31419). These vulnerabilities affect Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions and related variants. Red Hat has released updated kpatch modules to remediate these issues. Users should apply these official patches to mitigate the risks. No known exploits in the wild have been reported at this time.

This Red Hat security advisory addresses multiple vulnerabilities in the Linux kernel live patch module for kernel version 5.14.0-570.17.1.el9_6. The update fixes a privilege escalation or denial of service issue in the KVM component due to improper shadow page table entry handling (CVE-2026-23401), a heap overflow in the NFSv4.0 LOCK replay cache (CVE-2026-31402), and a use-after-free vulnerability in the bonding driver that can lead to denial of service (CVE-2026-31419). The advisory targets Red Hat Enterprise Linux 9.6 Extended Update Support and related variants. A security update is available to address these issues.