cbcvebase.
CVE-2025-38001
published 2025-06-06

CVE-2025-38001: In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We…

medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
In the Linux kernel, the following vulnerability has been resolved: net_sched: 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 is utilized with NETEM. The patch only checks the cl->cl_nactive field to determine whether it is the first insertion or not [2], but this field is only incremented by init_vf [3]. By using HFSC_RSC (which uses init_ed) [4], it is possible to bypass the check and insert the class twice in the eltree. Under normal conditions, this would lead to an infinite loop in hfsc_dequeue for the reasons we already explained in this report [5]. However, if TBF is added as root qdisc and it is configured with a very low rate, it can be utilized to prevent packets from being dequeued. This behavior can be exploited to perform subsequent insertions in the HFSC eltree and cause a UAF." To fix both the UAF and the infinite loop, with netem as an hfsc child, check explicitly in hfsc_enqueue whether the class is already in the eltree whenever the HFSC_RSC flag is set. [1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=141d34391abbb315d68556b7c67ad97885407547 [2] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1572 [3] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L677 [4] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1574 [5] https://lore.kernel.org/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/T/#u

Affected

36 ranges· showing 25
VendorProductVersion rangeFixed in
debiandebian_linux
debiandebian_linux
debianlinux< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
debianlinux-6.1< linux 6.1.147-1 (bookworm)linux 6.1.147-1 (bookworm)
googlechrome_chrome
linuxlinux
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < e5bee633cc276410337d54b99f77fbc1ad8801e5e5bee633cc276410337d54b99f77fbc1ad8801e5
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 6672e6c00810056acaac019fe26cdc26fee8a66c6672e6c00810056acaac019fe26cdc26fee8a66c
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 2c928b3a0b04a431ffcd6c8b7d88a267124a3a282c928b3a0b04a431ffcd6c8b7d88a267124a3a28
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < a0ec22fa20b252edbe070a9de8501eef63c17ef5a0ec22fa20b252edbe070a9de8501eef63c17ef5
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 295f7c579b07b5b7cf2dffe485f71cc2f27647cb295f7c579b07b5b7cf2dffe485f71cc2f27647cb
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 2f2190ce4ca972051cac6a8d7937448f8cb9673c2f2190ce4ca972051cac6a8d7937448f8cb9673c
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 4e38eaaabfb7fffbb371a51150203e19eee5d70e4e38eaaabfb7fffbb371a51150203e19eee5d70e
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 39ed887b1dd2d6b720f87e86692ac3006cc111c839ed887b1dd2d6b720f87e86692ac3006cc111c8
linuxlinux>= 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < ac9fe7dd8e730a103ae4481147395cc73492d786ac9fe7dd8e730a103ae4481147395cc73492d786
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.244-15.10.244-1
linuxlinux_kernel>= 0 < 6.1.147-16.1.147-1
linuxlinux_kernel>= 0 < 6.12.32-16.12.32-1
linuxlinux_kernel>= 0 < 6.12.32-16.12.32-1
linuxlinux_kernel>= 0 < 5.15.0-143.1535.15.0-143.153
linuxlinux_kernel>= 0 < 6.8.0-63.666.8.0-63.66
linuxlinux_kernel>= 0 < 6.14.0-23.236.14.0-23.23
linuxlinux_kernel>= 0 < 5.4.0-219.2395.4.0-219.239
linuxlinux_kernel>= 5.0.1 < 5.4.2945.4.294

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv8.8HIGH