kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()

A flaw was found in the Linux kernel's procfs component. When reading /proc/pid/stat, the dotaskstat function accesses task-realparent without proper Read-Copy-Update RCU protection. This missing protection creates a race condition, which can lead to a Use-After-Free UAF vulnerability. A local...

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: tcp: fix potential race in tcpv6synrecvsock CVE-2026-43198 kernel: netfilter: nfnetlinkcthelper: fix OOB read in nfnlcthelperdumptable CVE-2026-43450 kernel: sctp: revalidate list cursor...

RHEL 8 : kernel-rt (RHSA-2026:36348)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36348 advisory. The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism...

RHEL 8 : kernel (RHSA-2026:36349)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36349 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: tcp: fix potential race in...

kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()

A flaw was found in the Linux kernel's procfs component. When reading /proc/pid/stat, the dotaskstat function accesses task-realparent without proper Read-Copy-Update RCU protection. This missing protection creates a race condition, which can lead to a Use-After-Free UAF vulnerability. A local...

Astra Linux – Vulnerability in Linux 6.12

In the Linux kernel, the following vulnerability has been resolved: procfs: Fixed a possible double mmput operation in doprocmapquery. When a user provides a buffer of incorrect size for the PROCMAPQUERY build ID, we return an -ENAMETOOLONG error. After recent changes, this condition occurs later...

Astra Linux – Vulnerability in Linux 6.12

In the Linux kernel, the following vulnerabilities have been resolved: procfs: Avoid fetching the build ID while holding the VMA lock. Fix the PROCMAPQUERY to fetch the optional build ID only after releasing the mmaplock or the per-VMA lock, whichever was used to lock the VMA, to prevent deadlock...

SUSE CVE-2026-46259

In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading realparent in dotaskstat When reading /proc/pid/stat, dotaskstat accesses task-realparent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- dotaskstat var =...

CVE-2026-46259

A flaw was found in the Linux kernel's procfs component. When reading /proc/pid/stat, the dotaskstat function accesses task-realparent without proper Read-Copy-Update RCU protection. This missing protection creates a race condition, which can lead to a Use-After-Free UAF vulnerability. A local...

CVE-2026-46259

In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading realparent in dotaskstat When reading /proc/pid/stat, dotaskstat accesses task-realparent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- dotaskstat var =...

CVE-2026-46259 procfs: fix missing RCU protection when reading real_parent in do_task_stat()

In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading realparent in dotaskstat When reading /proc/pid/stat, dotaskstat accesses task-realparent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- dotaskstat var =...

CVE-2026-46259

In the Linux kernel, the following vulnerability has been resolved: procfs: fix missing RCU protection when reading realparent in dotaskstat When reading /proc/pid/stat, dotaskstat accesses task-realparent without proper RCU protection, which leads to: cpu 0 cpu 1 ----- ----- dotaskstat var =...

CVE-2026-46259

In the Linux kernel procfs path do_task_stat() reading /proc/[pid]/stat, task->real_parent is accessed without proper RCU protection, enabling a potential Use-After-Free when another task is released. The fix switches from task_tgid_nr_ns() to task_ppid_nr_ns() to add proper RCU protection for...

Linux Distros Unpatched Vulnerability : CVE-2026-46259

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - procfs: fix missing RCU protection when reading realparent in dotaskstat When reading /proc/pid/stat, dotaskstat accesses task-realparent without proper RCU...

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

In the Linux kernel, the following vulnerability has been resolved: The issue involves bcm: – a UAF Use-After-Free flaw in bcmprocshow. Bug: KASAN: A slabuse-after-free issue occurs in bcmprocshow+0x969/0xa80. A size 8 data block was read from address ffff888155846230 by the task cat/7862. CPU: 1...

SUSE CVE-2026-43178

In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput in doprocmapquery When user provides incorrectly sized buffer for build ID for PROCMAPQUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocke...

CVE-2026-43178

A flaw was found in the Linux kernel's procfs component. A local user, by providing a malformed input buffer during a specific memory mapping query PROCMAPQUERY, can trigger an error in how the kernel manages process memory. This can lead to a double release of memory resources, potentially causi...

EUVD-2026-27738

In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput in doprocmapquery When user provides incorrectly sized buffer for build ID for PROCMAPQUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocke...

CVE-2026-43178

In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput in doprocmapquery When user provides incorrectly sized buffer for build ID for PROCMAPQUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocke...

CVE-2026-43178 procfs: fix possible double mmput() in do_procmap_query()

In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput in doprocmapquery When user provides incorrectly sized buffer for build ID for PROCMAPQUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocke...