CVE-2025-21703 (GCVE-0-2025-21703)

Vulnerability from cvelistv5 – Published: 2025-02-18 14:37 – Updated: 2025-11-03 19:35
VLAI?
Title
netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()
Summary
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.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31 , < e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c (git)
Affected: 216509dda290f6db92c816dd54b83c1df9da9e76 , < 7f31d74fcc556a9166b1bb20515542de7bb939d1 (git)
Affected: c2047b0e216c8edce227d7c42f99ac2877dad0e4 , < 98a2c685293aae122f688cde11d9334dddc5d207 (git)
Affected: 10df49cfca73dfbbdb6c4150d859f7e8926ae427 , < 7b79ca9a1de6a428d486ff52fb3d602321c08f55 (git)
Affected: 3824c5fad18eeb7abe0c4fc966f29959552dca3e , < 1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5 (git)
Affected: 356078a5c55ec8d2061fcc009fb8599f5b0527f9 , < 6312555249082d6d8cc5321ff725df05482d8b83 (git)
Affected: f8d4bc455047cf3903cd6f85f49978987dbb3027 , < 839ecc583fa00fab785fde1c85a326743657fd32 (git)
Affected: f8d4bc455047cf3903cd6f85f49978987dbb3027 , < 638ba5089324796c2ee49af10427459c2de35f71 (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.78 , ≤ 6.6.* (semver)
Unaffected: 6.12.14 , ≤ 6.12.* (semver)
Unaffected: 6.13.3 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.