CVE-2026-98031

Summary

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

nexthop: Initialize extack in remove_nh_grp_entry()

remove_nh_grp_entry() prints the extack message when a listener fails to replace the reduced nexthop group. However, extack is not initialized and listeners are not required to set a message when returning an error. Neither netdevsim nor mlxsw do so when an allocation fails, resulting in the dereference of an uninitialized stack pointer.

Fix by zero-initializing extack, as was done in commit 6347c5314cee ("nexthop: initialize extack in nh_res_bucket_migrate()").

Affected Software

VendorProductVersion RangeStatus
LinuxLinux833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 030c878eaedf0449e2b5401a0a0146d0afcc645eaffected
LinuxLinux833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < d643cea4248668dc493c513aa7cbc6505eb1a4a9affected
LinuxLinux833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < d80677ad7aa5bebfccfd58caa4852b65abe70561affected
LinuxLinux833a1065eeb14437a9a0dfa9dad06ea09894e0b5 < 5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55baffected
LinuxLinux5.11affected
LinuxLinux0 < 5.11unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References