Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2025-37890— net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于释放后重用，可能导致UAF漏洞。

CVSS 7.8 · High EPSS 0.22% · P13

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 273bbcfa53541cde38b2003ad88a59b770306421 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< e0cf8ee23e1915431f262a7b2dee0c7a7d699af0 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< e3e949a39a91d1f829a4890e7dfe9417ac72e4d0 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 8df7d37d626430035b413b97cee18396b3450bef affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 6082a87af4c52f58150d40dec1716011d871ac21 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 2e7093c7a8aba5d4f8809f271488e5babe75e202 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< ac39fd4a757584d78ed062d4f6fd913f83bd98b5 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 141d34391abbb315d68556b7c67ad97885407547 affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-37890

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case). This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于释放后重用，可能导致UAF漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea ~ 273bbcfa53541cde38b2003ad88a59b770306421 -
Linux Linux 5.0 -

II. Public POCs for CVE-2025-37890

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-37890

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux