RHEL 9 : kernel (RHSA-2026:49032)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:49032 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: net/sched: clsapi: Handle TCACTCONSUME...

CVE-2026-43035

The CVE affects the Linux kernel net: sched: cls_api code path tc_chain_fill_node, where tcm_info in struct tcmsg was not initialized, leaking heap memory to userspace via a 4-byte field. The fix zeros tcm_info alongside other initialized fields. Affected/patched details from connected docs: upst...

CVE-2026-43035

In the Linux kernel, the following vulnerability has been resolved: net: sched: clsapi: fix tcchainfillnode to initialize tcminfo to zero to prevent an info-leak When building netlink messages, tcchainfillnode never initializes the tcminfo field of struct tcmsg. Since the allocation is not zeroed...

EUVD-2023-60448

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: remove blockcb from driverlist before freeing Error handler of tcfblockbind frees the whole bo-cblist on error. However, by that time the flowblockcb instances are already in the driver list because driver...

CVE-2023-54193 net/sched: cls_api: remove block_cb from driver_list before freeing

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: remove blockcb from driverlist before freeing Error handler of tcfblockbind frees the whole bo-cblist on error. However, by that time the flowblockcb instances are already in the driver list because driver...

CVE-2023-54193

CVE-2023-54193 affects the Linux kernel net/sched cls_api flow: when tcf_block_bind() errors, flow_block_cb objects were still in the driver_list, causing use-after-free. The fix removes flow_block_cb entries from driver_list before deallocation (the patch references show the changes). Affected: ...

CVE-2023-54193

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: remove blockcb from driverlist before freeing Error handler of tcfblockbind frees the whole bo-cblist on error. However, by that time the flowblockcb instances are already in the driver list because driver...

kernel: net/sched: cls_api: fix error handling causing NULL dereference

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: fix error handling causing NULL dereference tcfextsmisscookiebasealloc calls xaalloccyclic which can return 1 if the allocation succeeded after wrapping. This was treated as an error, with value 1 returned to...

Astra Linux – Vulnerability in Linux 6.12

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: Fixed error handling that caused NULL dereference. The function tcfextsmisscookiebasealloc calls xaalloccyclic, which may return 1 if the allocation succeeds after wrapping. This was previously treated as an...

AZL-58511 CVE-2025-21857 affecting package kernel for versions less than 6.6.82.1-1

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: fix error handling causing NULL dereference tcfextsmisscookiebasealloc calls xaalloccyclic which can return 1 if the allocation succeeded after wrapping. This was treated as an error, with value 1 returned to...

CVE-2025-21857 net/sched: cls_api: fix error handling causing NULL dereference

In the Linux kernel, the following vulnerability has been resolved: net/sched: clsapi: fix error handling causing NULL dereference tcfextsmisscookiebasealloc calls xaalloccyclic which can return 1 if the allocation succeeded after wrapping. This was treated as an error, with value 1 returned to...

kernel: use-after-free in tc_new_tfilter() in net/sched/cls_api.c

A use-after-free vulnerability was found in the tcnewtfilter function in net/sched/clsapi.c in the Linux kernel. The availability of local, unprivileged user namespaces allows privilege escalation...