CVE-2026-89955
CVE CVE-2026-89955EUVD EUVD-2026-80555Published 2026-09-16T10:32:39.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix NULL deref in status_show() during queue probe When vfio_ap_mdev_probe_queue() creates the sysfs attribute group, the queue's driver data has not yet been set. A concurrent read of the 'status' attribute can therefore call dev_get_drvdata() and get NULL, which is then passed directly to vfio_ap_mdev_for_queue() where q->apqn is unconditionally dereferenced, causing a NULL pointer dereference. Fix this by acquiring the update locks before calling sysfs_create_group(). The status_show() function acquires guests_lock before reading the driver data, so any concurrent read will block until after dev_set_drvdata() has been called and the update locks are released. As a bonus, the APQN no longer needs to be read from the queue struct after allocation — it can be read directly from apdev before allocation and stored in a local variable, which is then assigned to q->apqn once the allocation succeeds.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.2.5; 260f3ea141382386e97611e7c2029bc013088ab1 <31fa0a8a3c337ed2d200166d6926ab23c14f8b2e; patch: 7.3-rc1; patch: 6.12.110; patch: 6.18.51; patch: 6.6.157; 260f3ea141382386e97611e7c2029bc013088ab1 <dd6f4ef6f8a37412909ad787c837332fb070159c; 260f3ea141382386e97611e7c2029bc013088ab1 <7db2511fc601ca3a6e3fb1bdce02261c3c3167c3; patch: 0; 6.0; 260f3ea141382386e97611e7c2029bc013088ab1 <69632952aca04caa71e49953b6949fc04e788e67; 260f3ea141382386e97611e7c2029bc013088ab1 <e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
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- Linux — Linux
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