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Linux Kernel EUVDEUVD-2026-39840

| CVE-2026-53305 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-06-26 Linux GHSA-w4pj-2vvj-f3vp
Denial Of Service Linux Null Pointer Dereference Red Hat Suse Lenovo
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
4.4 MEDIUM

Writing to the sysfs driver unbind interface requires CAP_SYS_ADMIN (root), warranting PR:H; no confidentiality or integrity impact, only kernel crash.

3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
4.4 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 06, 2026 - 20:59 vuln.today
CVSS changed
Jul 06, 2026 - 20:37 NVD
5.5 (MEDIUM)
Patch available
Jun 26, 2026 - 21:02 EUVD
CVE Published
Jun 26, 2026 - 19:41 nvd
MEDIUM 5.5
CVE Published
Jun 26, 2026 - 19:41 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

usb: typec: ps883x: Fix Oops at unbind

When trying to unbind a device in order to bind to it vfio-platform as:

echo bc0000.geniqup > /sys/bus/platform/devices/bc0000.geniqup/driver/unbind

I get the following Oops:

[ 436.478639] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 [ 436.487762] Mem abort info: [ 436.490716] ESR = 0x0000000096000004 [ 436.494595] EC = 0x25: DABT (current EL), IL = 32 bits [ 436.500071] SET = 0, FnV = 0 [ 436.503250] EA = 0, S1PTW = 0 [ 436.506505] FSC = 0x04: level 0 translation fault [ 436.511533] Data abort info: [ 436.514558] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 436.520215] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 436.525436] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 436.530918] user pgtable: 4k pages, 48-bit VAs, pgdp=00000008861a9000 [ 436.537554] [0000000000000020] pgd=0000000000000000, p4d=0000000000000000 [ 436.544548] Internal error: Oops: 0000000096000004 [#1] SMP [ 436.550374] Modules linked in: [ 436.553542] CPU: 2 UID: 0 PID: 671 Comm: bash Tainted: G W 7.0.0-rc3-g56fcdd0911a5-dirty #2 PREEMPT [ 436.564440] Tainted: [W]=WARN [ 436.567515] Hardware name: LENOVO 91B6CTO1WW/3796, BIOS O6NKT3BA 05/02/2025 [ 436.574675] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) [ 436.581841] pc : ps883x_retimer_remove+0x14/0x94 [ 436.586605] lr : i2c_device_remove+0x28/0x84 [ 436.591017] sp : ffff8000847137c0

That's because the ps883x_retimer_remove() retrieves the driver data from i2c_get_clientdata() which was never set at probe. So, add i2c_set_clientdata() at the end of the probe.

AnalysisAI

NULL pointer dereference in the Linux kernel's ps883x USB Type-C retimer driver causes a kernel Oops during device unbind, resulting in a denial of service. The ps883x_retimer_remove() function calls i2c_get_clientdata() to retrieve driver-private state, but i2c_set_clientdata() was never called during probe, leaving the pointer NULL; dereference at offset 0x20 triggers a fatal translation fault. Systems with ps883x retimer hardware running affected kernel versions are vulnerable when a privileged local user unbinds the driver via sysfs. No active exploitation is confirmed (no CISA KEV listing), and the EPSS score of 0.17% (6th percentile) reflects negligible real-world exploitation probability.

Technical ContextAI

The ps883x is an I2C-attached USB Type-C retimer chip managed by the Linux kernel driver at drivers/usb/typec/retimer/ps883x.c. The bug is a CWE-476 (NULL Pointer Dereference) caused by a missing i2c_set_clientdata() call at the end of the probe function. I2C client drivers conventionally store their allocated private data structure in the i2c_client device's driver_data field via i2c_set_clientdata() so that remove callbacks can retrieve it with i2c_get_clientdata(). When this setter is omitted, the getter in ps883x_retimer_remove() returns NULL, and the subsequent pointer dereference at a fixed offset (0x20 in the crash trace) causes an unhandled translation fault at EL1, producing a kernel Oops. The affected CPE is cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:* for kernel versions from the introducing commit 257a087c8b5206e046048de6053fc8b3fa1af814 forward until the respective fix commits on each stable branch.

RemediationAI

Upgrade to a patched kernel release: Linux 7.1, 7.0.10, or 6.18.33, which incorporate the fix commits available at https://git.kernel.org/stable/c/37a3d1b6827783f26d2f8e6c7683e253ba79ae93, https://git.kernel.org/stable/c/c404d0ac0cb085cb7077ba32c334cc4042feb81a, and https://git.kernel.org/stable/c/381133848a033c2086cf9cafb226f425bd0414ff. The fix is a single addition of i2c_set_clientdata() at the end of the ps883x probe function; it can be backported manually to any affected stable branch. As a compensating control on unpatched systems, avoid unbinding the ps883x driver via sysfs (do not write to /sys/bus/platform/devices/*/driver/unbind for ps883x-managed nodes); note this prevents VFIO-platform passthrough of the retimer device. Restricting write access to sysfs unbind interfaces to root-only (the typical default) also limits the attack surface to fully privileged actors.

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Same weakness CWE-476 – NULL Pointer Dereference

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected

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EUVD-2026-39840 vulnerability details – vuln.today
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