CVE-2025-40153

Description

In the Linux kernel, the following vulnerability has been resolved:mm: hugetlb: avoid soft lockup when mprotect to large memory areaWhen calling mprotect() to a large hugetlb memory area in our customersworkload (~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-rc7Hardware name: GIGACOMPUTING R2A3-T40-AAV1/Jefferson CIO, BIOS 5.4.4.1 07/15/2025pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)pc: mte_clear_page_tags+0x14/0x24lr: mte_sync_tags+0x1c0/0x240sp: ffff80003150bb80x29: ffff80003150bb80 x28: ffff00739e9705a8 x27: 0000ffd2d6a00000x26: 0000ff8e4bc00000 x25: 00e80046cde00f45 x24: 0000000000022458x23: 0000000000000000 x22: 0000000000000004 x21: 000000011b380000x20: ffff000000000000 x19: 000000011b379f40 x18: 0000000000000000x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000x11: 0000000000000000 x10: 0000000000000000 x9 : ffffc875e0aa5e2cx8: 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000x5: fffffc01ce7a5c00 x4 : 00000000046cde00 x3 : fffffc0000000000x2: 0000000000000004 x1 : 0000000000000040 x0 : ffff0046cde7c000Call trace:mte_clear_page_tags+0x14/0x24set_huge_pte_at+0x25c/0x280hugetlb_change_protection+0x220/0x430change_protection+0x5c/0x8cmprotect_fixup+0x10c/0x294do_mprotect_pkey.constprop.0+0x2e0/0x3d4__arm64_sys_mprotect+0x24/0x44invoke_syscall+0x50/0x160el0_svc_common+0x48/0x144do_el0_svc+0x30/0xe0el0_svc+0x30/0xf0el0t_64_sync_handler+0xc4/0x148el0t_64_sync+0x1a4/0x1a8Soft lockup is not triggered with THP or base page because there iscond_resched() called for each PMD size.Although the soft lockup was triggered by MTE, it should be not MTEspecific. The other processing which takes long time in the loop maytrigger soft lockup too.So add cond_resched() for hugetlb to avoid soft lockup.

Risk Information

Base Score

5.5

MODERATE

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Score

Exploitation Probability

0.058

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234