Riskcovery

CVE-2025-40153

mm: hugetlb: avoid soft lockup when mprotect to large memory area

State
Published
Severity
Not scored
Published
Nov 12, 2025
Updated
May 11, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

Description

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

mm: hugetlb: avoid soft lockup when mprotect to large memory area

When calling mprotect() to a large hugetlb memory area in our customer's workload (~300GB hugetlb memory), soft lockup was observed:

watchdog: BUG: soft lockup - CPU#98 stuck for 23s! [t2_new_sysv:126916]

CPU: 98 PID: 126916 Comm: t2_new_sysv Kdump: loaded Not tainted 6.17-rc7 Hardware name: GIGACOMPUTING R2A3-T40-AAV1/Jefferson CIO, BIOS 5.4.4.1 07/15/2025 pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mte_clear_page_tags+0x14/0x24 lr : mte_sync_tags+0x1c0/0x240 sp : ffff80003150bb80 x29: ffff80003150bb80 x28: ffff00739e9705a8 x27: 0000ffd2d6a00000 x26: 0000ff8e4bc00000 x25: 00e80046cde00f45 x24: 0000000000022458 x23: 0000000000000000 x22: 0000000000000004 x21: 000000011b380000 x20: ffff000000000000 x19: 000000011b379f40 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : ffffc875e0aa5e2c x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : fffffc01ce7a5c00 x4 : 00000000046cde00 x3 : fffffc0000000000 x2 : 0000000000000004 x1 : 0000000000000040 x0 : ffff0046cde7c000

Call trace:   mte_clear_page_tags+0x14/0x24   set_huge_pte_at+0x25c/0x280   hugetlb_change_protection+0x220/0x430   change_protection+0x5c/0x8c   mprotect_fixup+0x10c/0x294   do_mprotect_pkey.constprop.0+0x2e0/0x3d4   __arm64_sys_mprotect+0x24/0x44   invoke_syscall+0x50/0x160   el0_svc_common+0x48/0x144   do_el0_svc+0x30/0xe0   el0_svc+0x30/0xf0   el0t_64_sync_handler+0xc4/0x148   el0t_64_sync+0x1a4/0x1a8

Soft lockup is not triggered with THP or base page because there is cond_resched() called for each PMD size.

Although the soft lockup was triggered by MTE, it should be not MTE specific. The other processing which takes long time in the loop may trigger soft lockup too.

So add cond_resched() for hugetlb to avoid soft lockup.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before 30498c44c2a0b20f6833ed7d8fc3df901507f760Affected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before 5783485ab2be06be5312b26c8793526edc09123dAffected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before 547e123e9d342a44c756446640ed847a8aeec611Affected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before 957faf9582f92bb2be8ebe4ab6aa1c2bc71d9859Affected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before 964598e6f70a1be9fe675280bf16b4f96b0a6809Affected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before 4975c975ed9457a77953a26aeef85fdba7cf5498Affected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before c6096f3947f68f96defedb8764b3b1ca4cf3469fAffected
  • 8f860591ffb29738cf5539b6fbf27f50dcdeb380 to before f52ce0ea90c83a28904c7cc203a70e6434adfecbAffected
LinuxLinux
  • 2.6.17Affected
  • before 2.6.17Not affected
  • 5.4.301 through 5.4.*Not affected
  • 5.10.246 through 5.10.*Not affected
  • 5.15.195 through 5.15.*Not affected
  • 6.1.156 through 6.1.*Not affected
  • 6.6.112 through 6.6.*Not affected
  • 6.12.53 through 6.12.*Not affected
  • 6.17.3 through 6.17.*Not affected
  • 6.18 and laterNot affected

References

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