Release Date: | 2025-05-16 | |
Impact: | Moderate | What is this? |
In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case). This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
See more information about CVE-2025-37890 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
Base Score: | 7.0 |
Vector String: | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Version: | 3.1 |
Attack Vector: | Local |
Attack Complexity: | High |
Privileges Required: | Low |
User Interaction: | None |
Scope: | Unchanged |
Confidentiality Impact: | High |
Integrity Impact: | High |
Availability Impact: | High |
Platform | Errata | Release Date |
Oracle Linux version 10 (kernel) | ELSA-2025-12662 | 2025-08-08 |
Oracle Linux version 10 (kernel-uek) | ELSA-2025-20480 | 2025-07-17 |
Oracle Linux version 10 (kernel-uek) | ELSA-2025-20530 | 2025-08-18 |
Oracle Linux version 7 (kernel-uek) | ELSA-2025-20521 | 2025-08-10 |
Oracle Linux version 8 (kernel) | ELSA-2025-12752 | 2025-08-05 |
Oracle Linux version 8 (kernel-uek) | ELSA-2025-20470 | 2025-07-14 |
Oracle Linux version 8 (kernel-uek) | ELSA-2025-20521 | 2025-08-10 |
Oracle Linux version 9 (kernel) | ELSA-2025-12746 | 2025-08-05 |
Oracle Linux version 9 (kernel-uek) | ELSA-2025-20470 | 2025-07-14 |
Oracle Linux version 9 (kernel-uek) | ELSA-2025-20480 | 2025-07-17 |
Oracle Linux version 9 (kernel-uek) | ELSA-2025-20530 | 2025-08-18 |
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