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

AI Predicted 7.8 Difficulty: Moderate EPSS 0.08% · P24

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 273bbcfa53541cde38b2003ad88a59b770306421affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< e0cf8ee23e1915431f262a7b2dee0c7a7d699af0affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< e3e949a39a91d1f829a4890e7dfe9417ac72e4d0affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 8df7d37d626430035b413b97cee18396b3450befaffected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 6082a87af4c52f58150d40dec1716011d871ac21affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 2e7093c7a8aba5d4f8809f271488e5babe75e202affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< ac39fd4a757584d78ed062d4f6fd913f83bd98b5affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 141d34391abbb315d68556b7c67ad97885407547affected
… +10 more rows
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I. Basic Information for CVE-2025-37890

Vulnerability Information
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Vulnerability Title
net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea ~ 273bbcfa53541cde38b2003ad88a59b770306421 -
LinuxLinux 5.0 -

II. Public POCs for CVE-2025-37890

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III. Intelligence Information for CVE-2025-37890

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37890

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