CVE-2025-21703
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2025
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31 | affected | git | e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c | Unavailable | None listed |
| 216509dda290f6db92c816dd54b83c1df9da9e76 | affected | git | 7f31d74fcc556a9166b1bb20515542de7bb939d1 | Unavailable | None listed |
| c2047b0e216c8edce227d7c42f99ac2877dad0e4 | affected | git | 98a2c685293aae122f688cde11d9334dddc5d207 | Unavailable | None listed |
| 10df49cfca73dfbbdb6c4150d859f7e8926ae427 | affected | git | 7b79ca9a1de6a428d486ff52fb3d602321c08f55 | Unavailable | None listed |
| 3824c5fad18eeb7abe0c4fc966f29959552dca3e | affected | git | 1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5 | Unavailable | None listed |
| 356078a5c55ec8d2061fcc009fb8599f5b0527f9 | affected | git | 6312555249082d6d8cc5321ff725df05482d8b83 | Unavailable | None listed |
| f8d4bc455047cf3903cd6f85f49978987dbb3027 | affected | git | 839ecc583fa00fab785fde1c85a326743657fd32 | Unavailable | None listed |
| f8d4bc455047cf3903cd6f85f49978987dbb3027 | affected | git | 638ba5089324796c2ee49af10427459c2de35f71 | Unavailable | None listed |
| 5.4.288 | affected | semver | 5.4.291 | Unavailable | None listed |
| 5.10.232 | affected | semver | 5.10.235 | Unavailable | None listed |
| 5.15.175 | affected | semver | 5.15.179 | Unavailable | None listed |
| 6.1.121 | affected | semver | 6.1.129 | Unavailable | None listed |
| 6.6.67 | affected | semver | 6.6.78 | Unavailable | None listed |
| 6.12.6 | affected | semver | 6.12.14 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.13 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.13 | Unavailable | None listed |
| 5.4.291 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.235 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.179 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.129 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.78 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.14 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.13.3 | unaffected | semver | Unavailable | 6.13.* | None listed |
| 6.14 | unaffected | original_commit_for_fix | Unavailable | * | None listed |