CVE-2026-80627

Summary

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

MIPS: mm: Fix out-of-bounds write in maar_res_walk()

maar_res_walk() uses wi->num_cfg as the index into the fixed-size wi->cfg array, but checks whether the array is full only after it has filled the selected entry. If walk_system_ram_range() reports more than 16 memory ranges, the overflow call writes one struct maar_config past the end of the array before WARN_ON() prevents num_cfg from advancing.

Move the full-array check before taking the array slot and return non-zero when the scratch array is full, so walk_system_ram_range() terminates the walk instead of invoking the callback for further ranges.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < a594100e147a6a67eb29189170f1df3645cda12baffected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < 8b3e0c1c63015deaf084286899f5b2d0526715deaffected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < 44c1d902cf0798b60762a7a98be992b9f5ded7ddaffected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < ac7385af1dca86a5ea704c80ca4dc822083ff9e2affected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < 431812eb88c200bc3ec33b88782c8cc415842074affected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < 92f38fe85198ace9b211bc7712b7951acfb94560affected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < 038f068cced8e9c49e8c419f3112d909ad366a3aaffected
LinuxLinuxa5718fe8f70f33b1b5b47a153057cfdd19684598 < 1b001b16bc88f3f7817e228acfd91ee01bdcfcceaffected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References