Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: sched/fair: Do not balance tasks to their current running CPUs. We encountered a situation where the balancer attempts to balance a migrated task with disabled status, triggering a warning in settaskcpu. The detailed error messag...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Stop the dlserver function before the CPU goes offline. The IBM CI tool reported a kernel warning1 when performing a CPU removal operation using drmgr2. For example: “drmgr -c cpu -r -q 1”. WARNING: CPU: 0 PID: 0 ...

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

A use-after-free vulnerability exists in the Linux kernel’s net/sched:clsu32 component, which can be exploited to achieve local privilege escalation. If the tcfchangeindev function fails, u32setparms will immediately return an error after incrementing or decrementing the reference counter in...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: net: sched: clsu32: Undo tcfbindfilter if u32replacehwknode When u32replacehwknode fails, we need to undo the tcf BindFilter operation performed at u32setparms...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: schedext: The issue of starving the scxenable function under fair-class saturation has been fixed. During scxenable, the READY - ENABLED task switching loop changes the calling thread’s schedclass from fair to ext. Since fair has...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerabilities have been resolved: MIPS: smp: fill in sibling and core maps earlier After enabling CONFIGSCHEDCORE landed during 5.14 cycle, 2-core 2-thread-per-core interAptiv CPS-driven started emitting the following messages: 0.025698 CPU1 revision is:...

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

A use-after-free vulnerability exists in the Linux kernel’s net/sched: schqfq component, which can be exploited to achieve local privilege escalation. When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers a use-after-free in qfqdequeue, due to the incorrect .pe...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: net/sched: fqpie: avoid stalls in fqpietimer When setting a high number of flows limit being 65536, fqpietimer is currently using too much time as syzbot reported. Add logic to yield the cpu every 2048 flows less than 150 usec on...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1

In the Linux kernel, the following vulnerabilities have been resolved: net/sched: taprio: improper checking of the TCATAPRIOTCENTRYINDEX attribute The taprioparsetcentry function does not correctly check the TCATAPRIOTCENTRYINDEX attribute: int tc; // Signed value tc =...

Astra Linux – Vulnerability in Linux, Linux 5.10

An improper update of the reference count vulnerability in the net/sched component of the Linux kernel allows a local attacker to escalate privileges to root. This issue affects Linux Kernel versions prior to 5.18, as well as version 4.14 and later versions...

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

A out-of-bounds write vulnerability exists in the Linux kernel’s net/sched:schqfq component, which can be exploited to achieve local privilege escalation. The qfqchangeagg function in net/sched/schqfq.c allows for an out-of-bounds write, as lmax is updated based on packet sizes without any bounds...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: net/sched: actskbmod: prevent kernel-infoleak The syzbot discovered that tcfskbmoddump was copying four bytes from the kernel stack to user space 1. The issue here is that ‘struct tcskbmod’ has a four-byte hole. We need to cle...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: schedext: The crash that occurred during the creation of helper kthreads due to scxenable has been fixed. A crash was observed when the schedext selftest runner was terminated with Ctrl+\ while test 15 was running: NIP...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: sched/fair: Fixed the issue with zerovruntime tracking. John reported that stress-ng-yield could cause his machine to behave abnormally. He managed to bisect the process to commit the change using the code b3d99f43c72b...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: sched/mmcid: Do not assume that a CID is owned by the CPU during mode switching. Shinichiro reported a KASAN UAF, which is actually an out-of-bounds access in the MMCID management code. CPU0 CPU1 T1 runs in userspace T0: forkT4 -...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: net: sched: sfb: Fixed an issue where a null pointer access occurred when sfbinit failed. When the default qdisc is sfb, if the qdisc of devqueue fails to be initialized during mqprioinit, sfbreset is invoked to clear resource...

Astra Linux – Vulnerability in Linux, Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: netsched: Fixed a NULL dereference in fifosetlimit. syzbot reported another NULL dereference in fifosetlimit. 1 I can reproduce the issue with the following commands: unshare -n tc qd add dev lo root handle 1:0 tbf limit 20000...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: sched/fair: Fixed an error in reweightentity. Syzbot detected a GPF in reweightentity. This issue has been fixed in commit 4ef0c5c6b5ba “kernel/sched: Fixed the issue where schedfork accesses an invalid schedtaskgroup”. There ...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: net/sched: schets: do not peek at classes beyond ‘nbands’ When the number of DRR classes decreases, the round-robin active list may contain elements that have already been freed in etsqdiscchange. As a result, it’s possible to...

Astra Linux – Vulnerability in Linux 5.10, Linux

In the Linux kernel, the following vulnerability has been resolved: net: sched: Fixed a memory leak in tcindexsetparms. Syzkaller reports a memory leak as follows: ===================================== BUG: Memory leak Unreferenced object: 0xffff88810c287f00 size 256 Comm “syz-executor105”, pid...