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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2025-21851

bpf: Fix softlockup in arena_map_free on 64k page kernel

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix softlockup in arena_map_free on 64k page kernel On an aarch64 kernel with CONFIG_PAGE_SIZE_64KB=y, arena_htab tests cause a segmentation fault and soft lockup. The same failure is not observed with 4k pages on aarch64. It turns out arena_map_free() is calling apply_to_existing_page_range() with the address returned by bpf_arena_get_kern_vm_start(). If this address is not page-aligned the code ends up calling apply_to_pte_range() with that unaligned address causing soft lockup. Fix it by round up GUARD_SZ to PAGE_SIZE << 1 so that the division by 2 in bpf_arena_get_kern_vm_start() returns a page-aligned value.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 317460317a02a1af512697e6e964298dedd8a163 to < c1f3f3892d4526f18aaeffdb6068ce861e793ee3affected
  • 317460317a02a1af512697e6e964298dedd8a163 to < 787d556a3de447e70964a4bdeba9196f62a62b1eaffected
  • 317460317a02a1af512697e6e964298dedd8a163 to < 517e8a7835e8cfb398a0aeb0133de50e31cae32baffected

Linux Linux

Default version status: affected

  • 6.9affected
  • 0 to < 6.9unaffected
  • 6.12.17 to ≤ 6.12.*unaffected
  • 6.13.5 to ≤ 6.13.*unaffected
  • 6.14 to ≤ *unaffected

References