Vulnerability Details CVE-2025-21703
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 6.3%
CVSS Severity
CVSS v3 Score 7.8
References
- https://git.kernel.org/stable/c/1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5
- https://git.kernel.org/stable/c/6312555249082d6d8cc5321ff725df05482d8b83
- https://git.kernel.org/stable/c/638ba5089324796c2ee49af10427459c2de35f71
- https://git.kernel.org/stable/c/7b79ca9a1de6a428d486ff52fb3d602321c08f55
- https://git.kernel.org/stable/c/7f31d74fcc556a9166b1bb20515542de7bb939d1
- https://git.kernel.org/stable/c/839ecc583fa00fab785fde1c85a326743657fd32
- https://git.kernel.org/stable/c/98a2c685293aae122f688cde11d9334dddc5d207
- https://git.kernel.org/stable/c/e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c
Products affected by CVE-2025-21703
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cpe:2.3:o:linux:linux_kernel:5.10.232
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cpe:2.3:o:linux:linux_kernel:5.10.233
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cpe:2.3:o:linux:linux_kernel:5.10.234
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cpe:2.3:o:linux:linux_kernel:5.15.175
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cpe:2.3:o:linux:linux_kernel:5.15.176
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cpe:2.3:o:linux:linux_kernel:5.15.177
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cpe:2.3:o:linux:linux_kernel:5.15.178
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cpe:2.3:o:linux:linux_kernel:5.4.288
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cpe:2.3:o:linux:linux_kernel:5.4.289
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cpe:2.3:o:linux:linux_kernel:5.4.290
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cpe:2.3:o:linux:linux_kernel:6.1.121
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cpe:2.3:o:linux:linux_kernel:6.1.122
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cpe:2.3:o:linux:linux_kernel:6.1.123
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cpe:2.3:o:linux:linux_kernel:6.1.124
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cpe:2.3:o:linux:linux_kernel:6.1.125
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cpe:2.3:o:linux:linux_kernel:6.1.126
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cpe:2.3:o:linux:linux_kernel:6.1.127
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cpe:2.3:o:linux:linux_kernel:6.1.128
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cpe:2.3:o:linux:linux_kernel:6.12.10
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cpe:2.3:o:linux:linux_kernel:6.12.11
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cpe:2.3:o:linux:linux_kernel:6.12.12
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cpe:2.3:o:linux:linux_kernel:6.12.13
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cpe:2.3:o:linux:linux_kernel:6.12.6
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cpe:2.3:o:linux:linux_kernel:6.12.7
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cpe:2.3:o:linux:linux_kernel:6.12.8
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cpe:2.3:o:linux:linux_kernel:6.12.9
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cpe:2.3:o:linux:linux_kernel:6.13
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cpe:2.3:o:linux:linux_kernel:6.13.1
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cpe:2.3:o:linux:linux_kernel:6.13.2
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cpe:2.3:o:linux:linux_kernel:6.14
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cpe:2.3:o:linux:linux_kernel:6.6.67
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cpe:2.3:o:linux:linux_kernel:6.6.68
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cpe:2.3:o:linux:linux_kernel:6.6.69
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cpe:2.3:o:linux:linux_kernel:6.6.70
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cpe:2.3:o:linux:linux_kernel:6.6.71
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cpe:2.3:o:linux:linux_kernel:6.6.72
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cpe:2.3:o:linux:linux_kernel:6.6.73
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cpe:2.3:o:linux:linux_kernel:6.6.74
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cpe:2.3:o:linux:linux_kernel:6.6.75
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cpe:2.3:o:linux:linux_kernel:6.6.76
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cpe:2.3:o:linux:linux_kernel:6.6.77