CVE-2025-37890
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)
net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc
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/
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) |
|---|---|---|---|---|---|
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | 273bbcfa53541cde38b2003ad88a59b770306421 | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | e0cf8ee23e1915431f262a7b2dee0c7a7d699af0 | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | e3e949a39a91d1f829a4890e7dfe9417ac72e4d0 | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | 8df7d37d626430035b413b97cee18396b3450bef | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | 6082a87af4c52f58150d40dec1716011d871ac21 | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | 2e7093c7a8aba5d4f8809f271488e5babe75e202 | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | ac39fd4a757584d78ed062d4f6fd913f83bd98b5 | Unavailable | None listed |
| 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea | affected | git | 141d34391abbb315d68556b7c67ad97885407547 | 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) |
|---|---|---|---|---|---|
| 5.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.0 | Unavailable | None listed |
| 5.4.294 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.238 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.182 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.138 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.90 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.28 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.14.6 | unaffected | semver | Unavailable | 6.14.* | None listed |
| 6.15 | unaffected | original_commit_for_fix | Unavailable | * | None listed |