Description
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Kernel
Default version status: unaffected
2.6.12 to < 6.6affected
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f ↗
- https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f ↗
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html ↗
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html ↗
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-769027.html ↗