Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Prevent overflow in size calculation for memdup_user() Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow. In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later. Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations. Found by Linux Verification Center (linuxtesting.org).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to < ad1bdd24a02d5a8d119af8e4cd50933780a6d29faffectedf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to < faa1ab4a23c42e34dc000ef4977b751d94d5148caffectedf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to < 88f3869649edbc4a13f6c2877091f81cd5a50f05affectedf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to < f855b119e62b004a5044ed565f2a2b368c4d3f16affectedf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to < 73483ca7e07a5e39bdf612eec9d3d293e8bef649affectedf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to < 7360ee47599af91a1d5f4e74d635d9408a54e489affected
Linux Linux
Default version status: affected
5.4affected0 to < 5.4unaffected5.15.187 to ≤ 5.15.*unaffected6.1.143 to ≤ 6.1.*unaffected6.6.96 to ≤ 6.6.*unaffected6.12.36 to ≤ 6.12.*unaffected6.15.5 to ≤ 6.15.*unaffected6.16 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f ↗
- https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c ↗
- https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05 ↗
- https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16 ↗
- https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649 ↗
- https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗