CVE-2026-31787

XSA-487 / CVE-2026-31787 Doble liberación en el kernel de Linux en el controladorprivcmd de Xen Una doble liberación de memoria del kernel en el controlador privcmd de Xen del kernel de Linux permite eludir el bloqueo del kernel arranque seguro. La explotación requiere acceso a nivel de root, lo...

K000163507: Linux kernel vulnerability CVE-2026-31787

Security Advisory Description In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix double free via VMA splitting privcmdvmops defines .close privcmdclose, but neither .maysplit nor .open. When userspace does a partial munmap on a privcmd mapping, the kernel splits...

AlmaLinux 9.6 [TuxCare] Security Update: kernel / kernel-abi-stablelists / kernel-core / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1782155469)

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1782155469 advisory. - In the Linux kernel, the following vulnerability has been resolved: udf: Fix preallocation discarding at indirect extent boundary...

Rocky Linux 9.6 [TuxCare] Security Update: kernel / kernel-abi-stablelists / kernel-core / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1782155469)

The Rocky Linux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1782155469 advisory. - In the Linux kernel, the following vulnerability has been resolved: udf: Fix preallocation discarding at indirect extent boundar...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fixed the double-free issue caused by VMA splitting privcmdvmops defines .close privcmdclose, but neither .maysplit nor .open. When the user space performs a partial munmap on a privcmd mapping, the kernel splits the...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: restricted usage in unprivileged domU The Xen privcmd driver allows for the issuance of arbitrary hypercalls from user space processes. This is normally not a problem, as access is usually limited to root, and the...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: xen/privcmd: fixed the error exit of privcmdioctldmop The error exit of privcmdioctldmop calls unlockpages, potentially with pages being NULL, leading to a NULL dereference. Additionally, lockpages does not check whether...

CentOS 9 : kernel-5.14.0-742.el9

The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the kernel-5.14.0-742.el9 build changelog. - In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix double free via VMA splitting privcmdvmops defines...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-053274)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-053274 advisory. In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix error exit of privcmdioctldmop The error exit of privcmdioctldmop is calling...

Exploit for Double Free in Linux Linux_Kernel

XSA-487 / CVE-2026-31787 Linux kernel double free in Xen pr...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-099003)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-099003 advisory. In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: restrict usage in unprivileged domU The Xen privcmd driver allows to issue arbitrary...

Unity Linux 20.1050e Security Update: kernel (UTSA-2026-102016)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-102016 advisory. In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: restrict usage in unprivileged domU The Xen privcmd driver allows to issue arbitrary...

kernel: xen/privcmd: fix double free via VMA splitting

A flaw was found in the Linux kernel's xen/privcmd module. A local user could exploit this by performing a partial unmapping of a privcmd memory region. This action causes a Virtual Memory Area VMA to split, leading to duplicated internal memory pointers. As a result, the same memory can be freed...

kernel: xen/privcmd: fix double free via VMA splitting

A flaw was found in the Linux kernel's xen/privcmd module. A local user could exploit this by performing a partial unmapping of a privcmd memory region. This action causes a Virtual Memory Area VMA to split, leading to duplicated internal memory pointers. As a result, the same memory can be freed...

kernel: xen/privcmd: fix double free via VMA splitting

A flaw was found in the Linux kernel's xen/privcmd module. A local user could exploit this by performing a partial unmapping of a privcmd memory region. This action causes a Virtual Memory Area VMA to split, leading to duplicated internal memory pointers. As a result, the same memory can be freed...

The vulnerability of the buildid_show() function in the drivers/xen/privcmd.c file of the Linux kernel device driver module allows a attacker to compromise the confidentiality, integrity, and accessibility of the protected information.

The vulnerability of the buildidshow function in the drivers/xen/privcmd.c module of the Linux kernel device driver library is related to the re-release of previously released memory. Exploiting this vulnerability could allow an attacker to compromise the confidentiality, integrity, and...

RHEL 8 : kernel (RHSA-2026:47248)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:47248 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: xen/privcmd: fix double free...

RLSA-2026:27789 Important: kernel security, bug fix, and enhancement update

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: can: isotp: fix tx.buf use-after-free in isotpsendmsg CVE-2026-31474 kernel: mptcp: fix slab-use-after-free in inetlookupestablished CVE-2026-31669 kernel: xen/privcmd: fix double free vi...

RockyLinux 9 : kernel (RLSA-2026:27789)

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:27789 advisory. kernel: can: isotp: fix tx.buf use-after-free in isotpsendmsg CVE-2026-31474 kernel: mptcp: fix slab-use-after-free in inetlookupestablished...

RLSA-2026:27288 Important: kernel security, bug fix, and enhancement update

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: can: isotp: fix tx.buf use-after-free in isotpsendmsg CVE-2026-31474 kernel: mptcp: fix slab-use-after-free in inetlookupestablished CVE-2026-31669 kernel: rxrpc: Fix RxGK token loading t...