Description (CNA)
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/
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 273bbcfa53541cde38b2003ad88a59b770306421; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before e0cf8ee23e1915431f262a7b2dee0c7a7d699af0; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before e3e949a39a91d1f829a4890e7dfe9417ac72e4d0; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 8df7d37d626430035b413b97cee18396b3450bef; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 6082a87af4c52f58150d40dec1716011d871ac21; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 2e7093c7a8aba5d4f8809f271488e5babe75e202; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before ac39fd4a757584d78ed062d4f6fd913f83bd98b5; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 141d34391abbb315d68556b7c67ad97885407547 |
| Linux / Linux | affected 5.0; unaffected 0 before 5.0; unaffected 5.4.294 through 5.4.*; unaffected 5.10.238 through 5.10.*; unaffected 5.15.182 through 5.15.*; unaffected 6.1.138 through 6.1.*; unaffected 6.6.90 through 6.6.*; unaffected 6.12.28 through 6.12.*; unaffected 6.14.6 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421
- https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0
- https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0
- https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef
- https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21
- https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202
- https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5
- https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.