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CVE-2025-40245— nios2: ensure that memblock.current_limit is set when setting pfn limits

EPSS 0.03% · P9
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I. Basic Information for CVE-2025-40245

Vulnerability Information
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Vulnerability Title
nios2: ensure that memblock.current_limit is set when setting pfn limits
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nios2未正确设置memblock.current_limit，可能导致内存映射越界。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 7f7bc20bc41a4fbcd2db75b375ac95e5faf958ae ~ 25f09699edd360b534ccae16bc276c3b52c471f3 -
LinuxLinux 5.12 -

II. Public POCs for CVE-2025-40245

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III. Intelligence Information for CVE-2025-40245

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Same Patch Batch · Linux · 2025-12-04 · 53 CVEs total

CVE-2025-40229mm/damon/core: fix potential memory leak by cleaning ops_filter in damon_destroy_scheme
CVE-2025-40214af_unix: Initialise scc_index in unix_add_edge().
CVE-2025-40215xfrm: delete x->tunnel as we delete x
CVE-2025-40220fuse: fix livelock in synchronous file put from fuseblk workers
CVE-2025-40217pidfs: validate extensible ioctls
CVE-2025-40218mm/damon/vaddr: do not repeat pte_offset_map_lock() until success
CVE-2025-40219PCI/IOV: Fix race between SR-IOV enable/disable and hotplug
CVE-2025-40216io_uring/rsrc: don't rely on user vaddr alignment
CVE-2025-40227mm/damon/sysfs: dealloc commit test ctx always
CVE-2025-40228mm/damon/sysfs: catch commit test ctx alloc failure
CVE-2025-40226firmware: arm_scmi: Account for failed debug initialization
CVE-2025-40230mm: prevent poison consumption when splitting THP
CVE-2025-40231vsock: fix lock inversion in vsock_assign_transport()
CVE-2025-40232rv: Fully convert enabled_monitors to use list_head as iterator
CVE-2025-40233ocfs2: clear extent cache after moving/defragmenting extents
CVE-2025-40234platform/x86: alienware-wmi-wmax: Fix NULL pointer dereference in sleep handlers
CVE-2025-40236virtio-net: zero unused hash fields
CVE-2025-40235btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()
CVE-2025-40237fs/notify: call exportfs_encode_fid with s_umount
CVE-2025-40238net/mlx5: Fix IPsec cleanup over MPV device

Showing top 20 of 53 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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