CVE-2026-89955 (GCVE-0-2026-89955)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-10-30 12:33
VLAI
Title
s390/vfio-ap: Fix NULL deref in status_show() during queue probe
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 260f3ea141382386e97611e7c2029bc013088ab1 , < 10606c9af18baed75cd180b96ee695441aa15134 (git)
Affected: 260f3ea141382386e97611e7c2029bc013088ab1 , < 31fa0a8a3c337ed2d200166d6926ab23c14f8b2e (git)
Affected: 260f3ea141382386e97611e7c2029bc013088ab1 , < e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9 (git)
Affected: 260f3ea141382386e97611e7c2029bc013088ab1 , < 69632952aca04caa71e49953b6949fc04e788e67 (git)
Affected: 260f3ea141382386e97611e7c2029bc013088ab1 , < 7db2511fc601ca3a6e3fb1bdce02261c3c3167c3 (git)
Affected: 260f3ea141382386e97611e7c2029bc013088ab1 , < dd6f4ef6f8a37412909ad787c837332fb070159c (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio-ap: Fix NULL deref in status_show() during queue probe\n\nWhen vfio_ap_mdev_probe_queue() creates the sysfs attribute group,\nthe queue\u0027s driver data has not yet been set. A concurrent read of\nthe \u0027status\u0027 attribute can therefore call dev_get_drvdata() and\nget NULL, which is then passed directly to\nvfio_ap_mdev_for_queue() where q-\u003eapqn is unconditionally\ndereferenced, causing a NULL pointer dereference.\n\nFix this by acquiring the update locks before calling\nsysfs_create_group(). The status_show() function acquires\nguests_lock before reading the driver data, so any concurrent\nread will block until after dev_set_drvdata() has been called\nand the update locks are released.\n\nAs a bonus, the APQN no longer needs to be read from the queue\nstruct after allocation \u2014 it can be read directly from apdev\nbefore allocation and stored in a local variable, which is then\nassigned to q-\u003eapqn once the allocation succeeds."
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}



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