net_sched: sch_sfq: move the limit validation
Published May 1, 2025
7.8
HIGHCVSS 3.1
EPSS 0.30%
Description
It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed.
Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations:
tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1
This fixes the following syzkaller reported crash:
------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375
Affected products
-
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
-
- Version 6.1.129StatusaffectedConstraints<6.1.135
- Version 6.12.13StatusaffectedConstraints<6.12.24
- Version 6.13.2StatusaffectedConstraints<6.13.12
- Version 6.6.76StatusaffectedConstraints<6.6.88
- Version
-
- Version 6.14StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<6.14
- Version 6.1.135StatusunaffectedConstraints<=6.1.*
- Version 6.12.24StatusunaffectedConstraints<=6.12.*
- Version 6.13.12StatusunaffectedConstraints<=6.13.*
- Version 6.14.3StatusunaffectedConstraints<=6.14.*
- Version 6.15StatusunaffectedConstraints<=*
- Version 6.6.88StatusunaffectedConstraints<=6.6.*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
| ||||||||||||||||||||||||||||||
| Linux | Linux | unaffected |
| ||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
Configuration 1
- ≥ 6.1.129 · < 6.1.135
- ≥ 6.6.76 · < 6.6.88
- ≥ 6.12.13 · < 6.12.24
- ≥ 6.13.2 · < 6.13.12
- ≥ 6.14 · < 6.14.3
- 6.15
Configuration 2
- 11.0
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel-rt
Out of support scope
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Out of support scope | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (15)
- https://access.redhat.com/security/cve/CVE-2025-37752 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2363296 Issue Tracking
- https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49 Patch
- https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d Patch
- https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219 Patch
- https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688 Patch
- https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4 Patch
- https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9 Patch
- https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70 Patch
- https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a Patch
- https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8 Patch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html Mailing List
- https://lore.kernel.org/linux-cve-announce/2025050137-CVE-2025-37752-653f@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2025-37752
- https://www.cve.org/CVERecord?id=CVE-2025-37752
Change history (0)
No recorded changes yet.