CVE-2025-40245 (GCVE-0-2025-40245)

Vulnerability from cvelistv5 – Published: 2025-12-04 15:31 – Updated: 2026-01-02 15:33
VLAI?
Title
nios2: ensure that memblock.current_limit is set when setting pfn limits
Summary
In the Linux kernel, the following vulnerability has been resolved: nios2: ensure that memblock.current_limit is set when setting pfn limits On nios2, with CONFIG_FLATMEM set, the kernel relies on memblock_get_current_limit() to determine the limits of mem_map, in particular for max_low_pfn. Unfortunately, memblock.current_limit is only default initialized to MEMBLOCK_ALLOC_ANYWHERE at this point of the bootup, potentially leading to situations where max_low_pfn can erroneously exceed the value of max_pfn and, thus, the valid range of available DRAM. This can in turn cause kernel-level paging failures, e.g.: [ 76.900000] Unable to handle kernel paging request at virtual address 20303000 [ 76.900000] ea = c0080890, ra = c000462c, cause = 14 [ 76.900000] Kernel panic - not syncing: Oops [ 76.900000] ---[ end Kernel panic - not syncing: Oops ]--- This patch fixes this by pre-calculating memblock.current_limit based on the upper limits of the available memory ranges via adjust_lowmem_bounds, a simplified version of the equivalent implementation within the arm architecture.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae , < 25f09699edd360b534ccae16bc276c3b52c471f3 (git)
Affected: 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae , < 5c3e38a367822f036227dd52bac82dc4a05157e2 (git)
Affected: 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae , < b1ec9faef7e36269ca3ec890972a78effbaeb975 (git)
Affected: 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae , < 90f5f715550e07cd6a51f80fc3f062d832c8c997 (git)
Affected: 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae , < 8912814f14e298b83df072fecc1f7ed1b63b1b2c (git)
Affected: 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae , < a20b83cf45be2057f3d073506779e52c7fa17f94 (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnios2: ensure that memblock.current_limit is set when setting pfn limits\n\nOn nios2, with CONFIG_FLATMEM set, the kernel relies on\nmemblock_get_current_limit() to determine the limits of mem_map, in\nparticular for max_low_pfn.\nUnfortunately, memblock.current_limit is only default initialized to\nMEMBLOCK_ALLOC_ANYWHERE at this point of the bootup, potentially leading\nto situations where max_low_pfn can erroneously exceed the value of\nmax_pfn and, thus, the valid range of available DRAM.\n\nThis can in turn cause kernel-level paging failures, e.g.:\n\n[   76.900000] Unable to handle kernel paging request at virtual address 20303000\n[   76.900000] ea = c0080890, ra = c000462c, cause = 14\n[   76.900000] Kernel panic - not syncing: Oops\n[   76.900000] ---[ end Kernel panic - not syncing: Oops ]---\n\nThis patch fixes this by pre-calculating memblock.current_limit\nbased on the upper limits of the available memory ranges via\nadjust_lowmem_bounds, a simplified version of the equivalent\nimplementation within the arm architecture."
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    "dateReserved": "2025-04-16T07:20:57.181Z",
    "dateUpdated": "2026-01-02T15:33:15.808Z",
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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