CVE-2025-37915 (GCVE-0-2025-37915)

Vulnerability from cvelistv5 – Published: 2025-05-20 15:21 – Updated: 2025-11-03 19:57
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: drr: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of drr, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before adding to the list to cover for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < 5da3aad1a13e7edb8ff0778a444ccf49930313e9 (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < 4b07ac06b0a712923255aaf2691637693fc7100d (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < 2968632880f1792007eedd12eeedf7f6e2b7e9f3 (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < 4f0ecf50cdf76da95828578a92f130b653ac2fcf (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < db205b92dfe0501e5b92fb7cf00971d0e44ba3eb (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < 26e75716b94d6ff9be5ea07d63675c4d189f30b4 (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < ab2248110738d4429668140ad22f530a9ee730e1 (git)
Affected: 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea , < f99a3fbf023e20b626be4b0f042463d598050c9a (git)
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    Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.294 , ≤ 5.4.* (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.182 , ≤ 5.15.* (semver)
Unaffected: 6.1.138 , ≤ 6.1.* (semver)
Unaffected: 6.6.90 , ≤ 6.6.* (semver)
Unaffected: 6.12.28 , ≤ 6.12.* (semver)
Unaffected: 6.14.6 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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Como se describe en el informe de Gerrard [1], existen casos de uso en los que una qdisc hija de netem har\u00e1 que la devoluci\u00f3n de llamada de encolado de la qdisc madre sea reentrante. En el caso de drr, no habr\u00e1 un UAF, pero el c\u00f3digo agregar\u00e1 el mismo clasificador a la lista dos veces, lo que causar\u00e1 corrupci\u00f3n de memoria. Adem\u00e1s de verificar que qlen sea cero, este parche verifica si la clase ya se agreg\u00f3 a active_list (cl_is_active) antes de agregarla a la lista para cubrir el caso reentrante. 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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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