CVE-2025-38193net_sched: sch_sfq: reject invalid perturb period
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e0936ff56be4e08ad5b60ec26971eae0c40af305; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2254d038dab9c194fe6a4b1ce31034f42e91a6e5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 956b5aebb349449b38d920d444ca1392d43719d1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b11a50544af691b787384089b68f740ae20a441b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0357da9149eac621f39e235a135ebf155f01f7c3; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f9b97d466e6026ccbdda30bb5b71965b67ccbc82; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 590b2d7d0beadba2aa576708a05a05f0aae39295; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7ca52541c05c832d32b112274f81a985101f9ba8 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.13 before 5.4.297; from 5.5 before 5.10.240; from 5.11 before 5.15.186; from 5.16 before 6.1.142; from 6.2 before 6.6.95; from 6.7 before 6.12.35; from 6.13 before 6.15.4; 2.6.12; and 5 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/e0936ff56be4e08ad5b60ec26971eae0c40af305patch
- https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5patch
- https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1patch
- https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441bpatch
- https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3patch
- https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82patch
- https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295patch
- https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlthird-party-advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.