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CVE-2026-23019: net: marvell: prestera: fix NULL dereference on devlink_alloc() failure

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-31 · updated 2026-10-15
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix NULL dereference on devlink_alloc() failure devlink_alloc() may return NULL on allocation failure, but prestera_devlink_alloc() unconditionally calls devlink_priv() on the returned pointer. This leads to a NULL pointer dereference if devlink allocation fails. Add a check for a NULL devlink pointer and return NULL early to avoid the crash.

Affected products

• Linux kernel: from 5.10.1 before 5.15.198; from 5.16 before 6.1.161; from 6.2 before 6.6.121; from 6.7 before 6.12.66; from 6.13 before 6.18.6; 5.10, 6.19-rc1, 6.19-rc2, 6.19-rc3, 6.19-rc4, 6.19-rc5 (+3) — fixed in 5.15.198, 6.1.161, 6.12.66, 6.18.6, 6.6.121

How to fix

Upgrade to a fixed version: Linux kernel 5.15.198, 6.1.161, 6.12.66, 6.18.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/325aea74be7e192b5c947c782da23b0d19a5fda2
• https://git.kernel.org/stable/c/326a4b7e61d01db3507f71c8bb5e85362f607064
• https://git.kernel.org/stable/c/3950054c9512add0cc79ab7e72b6d2f9f675e25b
• https://git.kernel.org/stable/c/8a4333b2818f0d853b43e139936c20659366e4a0
• https://git.kernel.org/stable/c/94e070cd50790317fba7787ae6006934b7edcb6f
• https://git.kernel.org/stable/c/a428e0da1248c353557970848994f35fd3f005e2
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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