kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

A use-after-free vulnerability has been identified in the Linux kernel's HFSC Hierarchical Fair Service Curve queuing discipline when it is configured with NETEM Network Emulation as a child. This flaw can lead to a kernel panic or crash due to incorrect assumptions about the queue state...

kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

A use-after-free vulnerability has been identified in the Linux kernel's HFSC Hierarchical Fair Service Curve queuing discipline when it is configured with NETEM Network Emulation as a child. This flaw can lead to a kernel panic or crash due to incorrect assumptions about the queue state...

SUSE CVE-2025-38468

In the Linux kernel, the following vulnerability has been resolved: net/sched: Return NULL when htblookupleaf encounters an empty rbtree htblookupleaf has a BUGON that can trigger with the following: tc qdisc del dev lo root tc qdisc add dev lo root handle 1: htb default 1 tc class add dev lo...

CVE-2025-38468: NULL Pointer Dereference

In the Linux kernel, the following vulnerability has been resolved: net/sched: Return NULL when htblookupleaf encounters an empty rbtree htblookupleaf has a BUGON that can trigger with the following: tc qdisc del dev lo root tc qdisc add dev lo root handle 1: htb default 1 tc class add dev lo...

SUSE-SU-2025:02322-1 Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP4 RT kernel was updated to receive various security bugfixes. The following security bugs were fixed: - CVE-2021-47557: net/sched: schets: do not peek at classes beyond 'nbands' bsc1207361 bsc1225468. - CVE-2021-47595: net/sched: schets: do not remove idle classes...

Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP5 RT kernel was updated to receive various security bugfixes. The following security bugs were fixed: CVE-2021-47557: net/sched: schets: do not peek at classes beyond 'nbands' bsc1207361 bsc1225468. CVE-2021-47595: net/sched: schets: do not remove idle classes from...

Security update for the Linux Kernel

The SUSE Linux Enterprise 15 SP3 RT kernel was updated to receive various security bugfixes. The following security bugs were fixed: CVE-2022-50085: dm raid: fix address sanitizer warning in raidresume bsc1245147. CVE-2022-50087: firmware: armscpi: Ensure scpiinfo is not assigned if the probe fai...

net_sched: qfq: Fix double list add in class with netem as child qdisc

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net_sched: ets: Fix double list add in class with netem as child qdisc

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net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

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Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix WRITESAME No Data Buffer crash In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like...

SUSE CVE-2025-38001

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch 141d34391abbb315d68556b7c67ad97885407547 1 can be bypassed, and a UAF can still occur when HFSC ...

AZL-63681 CVE-2025-38001 affecting package kernel for versions less than 6.6.96.1-1

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch 141d34391abbb315d68556b7c67ad97885407547 1 can be bypassed, and a UAF can still occur when HFSC ...

CVE-2025-38001

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch 141d34391abbb315d68556b7c67ad97885407547 1 can be bypassed, and a UAF can still occur when HFSC ...

UBUNTU-CVE-2025-38001

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch 141d34391abbb315d68556b7c67ad97885407547 1 can be bypassed, and a UAF can still occur when HFSC ...

CVE-2025-38001 net_sched: hfsc: Address reentrant enqueue adding class to eltree twice

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch 141d34391abbb315d68556b7c67ad97885407547 1 can be bypassed, and a UAF can still occur when HFSC ...

CVE-2025-38001

The CVE-2025-38001 issue affects the Linux kernel HFSC scheduling path (net_sched) and is triggered by a flawed enqueue path. The root cause is a reentrancy problem in hfsc_enqueue where a class can be inserted twice into the eltree when HFSC_RSC is used, because the code only checks cl->cl_na...

CVE-2025-38001: Loop with Unreachable Exit Condition

In the Linux kernel, the following vulnerability has been resolved: netsched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch 141d34391abbb315d68556b7c67ad97885407547 1 can be bypassed, and a UAF can still occur when HFSC ...

SUSE CVE-2025-37913

In the Linux kernel, the following vulnerability has been resolved: netsched: qfq: Fix double list add in class with netem as child qdisc As described in Gerrard's report 1, there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of qfq,...

SUSE CVE-2025-37914

In the Linux kernel, the following vulnerability has been resolved: netsched: ets: Fix double list add in class with netem as child qdisc As described in Gerrard's report 1, there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of ets,...