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CVE-2025-21703— netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()

CVSS 7.8 · High EPSS 0.02% · P4

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31< e395fec75ac2dbffc99b4bce57b7f1f3c5449f2caffected
216509dda290f6db92c816dd54b83c1df9da9e76< 7f31d74fcc556a9166b1bb20515542de7bb939d1affected
c2047b0e216c8edce227d7c42f99ac2877dad0e4< 98a2c685293aae122f688cde11d9334dddc5d207affected
10df49cfca73dfbbdb6c4150d859f7e8926ae427< 7b79ca9a1de6a428d486ff52fb3d602321c08f55affected
3824c5fad18eeb7abe0c4fc966f29959552dca3e< 1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5affected
356078a5c55ec8d2061fcc009fb8599f5b0527f9< 6312555249082d6d8cc5321ff725df05482d8b83affected
f8d4bc455047cf3903cd6f85f49978987dbb3027< 839ecc583fa00fab785fde1c85a326743657fd32affected
f8d4bc455047cf3903cd6f85f49978987dbb3027< 638ba5089324796c2ee49af10427459c2de35f71affected
… +10 more rows
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I. Basic Information for CVE-2025-21703

Vulnerability Information
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Vulnerability Title
netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于存在内存释放后重用。
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 83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31 ~ e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c -
LinuxLinux 6.13 -

II. Public POCs for CVE-2025-21703

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III. Intelligence Information for CVE-2025-21703

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21703

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