Vulnerabilities of Linux operating system kernel components, such as block and bfq, allow attackers to elevate their privileges within the system.

The vulnerability of the bfqinitrq function in Linux kernel components related to block devices and the bfq subsystem is associated with errors that occur after deallocation. Exploiting this vulnerability can allow an attacker to gain elevated privileges within the system...

net_sched: sch_sfq: don't allow 1 packet limit

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UBUNTU-CVE-2022-49412

In the Linux kernel, the following vulnerability has been resolved: bfq: Avoid merging queues with different parents It can happen that the parent of a bfqq changes between the moment we decide two queues are worth to merge and set bic-stablemergebfqq and the moment bfqsetupmerge is called. This...

UBUNTU-CVE-2022-49411

In the Linux kernel, the following vulnerability has been resolved: bfq: Make sure bfqg for which we are queueing requests is online Bios queued into BFQ IO scheduler can be associated with a cgroup that was already offlined. This may then cause insertion of this bfqgroup into a service tree. But...

PT-2024-35629 · Linux · Linux Kernel

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 6.12.0 Description: A slab-use-after-free issue has been identified in the Linux kernel. The issue arises from the association of the bic with sync bfqq and the inability to put bfq release process ref into bfq...

SUSE CVE-2024-50039

In the Linux kernel, the following vulnerability has been resolved: net/sched: accept TCASTAB only for root qdisc Most qdiscs maintain their backlog using qdiscpktlenskb on the assumption it is invariant between the enqueue and dequeue handlers. Unfortunately syzbot can crash a host rather easily...

AZL-50829 CVE-2024-49854 affecting package kernel for versions less than 5.15.173.1-1

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing wakerbfqq after splitting After commit 42c306ed7233 "block, bfq: don't break merge chain in bfqsplitbfqq", if the current procress is the last holder of bfqq, the bfqq can be freed after...

kernel: ip_vti: fix potential slab-use-after-free in decode_session6

A use-after-free flaw was found in the Linux kernel's ipvti IPsec Virtual Tunnel Interface implementation when transmitting IPv6 packets with the SFB qdisc attached. A local user with CAPNETADMIN capability can trigger this issue by configuring an ipvti interface with an SFB qdisc and sending IPv...

kernel: net/sched: sch_fq: fix integer overflow of "credit"

An integer overflow flaw was found in the Linux kernel network fair-queueing scheduler in the way the initial per-flow credit is set. If a configuration provides an excessively large initial quantum, the credit value can overflow to a negative number, leading to excessive scheduling and soft...

kernel: bfq: Make sure bfqg for which we are queueing requests is online

A use-after-free vulnerability exists in the Linux kernel. The Bios queued into the BFQ IO scheduler can be associated with a cgroup that was already offline. This issue may then cause the insertion of this bfqgroup into a service tree. This bfqgroup will get freed as soon as the last associated...

kernel: bfq: Avoid merging queues with different parents

In the Linux kernel, the following vulnerability has been resolved: bfq: Avoid merging queues with different parents It can happen that the parent of a bfqq changes between the moment we decide two queues are worth to merge and set bic-stablemergebfqq and the moment bfqsetupmerge is called. This...

kernel: bfq: Update cgroup information before merging bio

In the Linux kernel, the following vulnerability has been resolved: bfq: Update cgroup information before merging bio When the process is migrated to a different cgroup or in case of writeback just starts submitting bios associated with a different cgroup bfqmergebio can operate with stale cgroup...