CVE-2025-38000
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)
sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue()
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() When enqueuing the first packet to an HFSC class, hfsc_enqueue() calls the child qdisc's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. If the child qdisc uses qdisc_peek_dequeued(), this may trigger an immediate dequeue and potential packet drop. In such cases, qdisc_tree_reduce_backlog() is called, but the HFSC qdisc's qlen and backlog have not yet been updated, leading to inconsistent queue accounting. This can leave an empty HFSC class in the active list, causing further consequences like use-after-free. This patch fixes the bug by moving the increment of sch->q.qlen and sch->qstats.backlog before the call to the child qdisc's peek() operation. This ensures that queue length and backlog are always accurate when packet drops or dequeues are triggered during the peek.
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) |
|---|---|---|---|---|---|
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | 1034e3310752e8675e313f7271b348914008719a | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | f9f593e34d2fb67644372c8f7b033bdc622ad228 | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | 89c301e929a0db14ebd94b4d97764ce1d6981653 | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | 93c276942e75de0e5bc91576300d292e968f5a02 | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | 49b21795b8e5654a7df3d910a12e1060da4c04cf | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | 3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335 | Unavailable | None listed |
| 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 | affected | git | 3f981138109f63232a5fb7165938d4c945cc1b9d | 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) |
|---|---|---|---|---|---|
| 4.8 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.8 | Unavailable | None listed |
| 5.4.294 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.238 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.185 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.141 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.93 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.31 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.14.9 | unaffected | semver | Unavailable | 6.14.* | None listed |
| 6.15 | unaffected | original_commit_for_fix | Unavailable | * | None listed |