Description

In the Linux kernel, the following vulnerability has been resolved: sched/numa: Fix the potential null pointer dereference in task_numa_work() When running stress-ng-vm-segv test, we found a null pointer dereference error in task_numa_work(). Here is the backtrace: [323676.066985] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ...... [323676.067108] CPU: 35 PID: 2694524 Comm: stress-ng-vm-se ...... [323676.067113] pstate: 23401009 (nzCv daif +PAN -UAO +TCO +DIT +SSBS BTYPE=--) [323676.067115] pc : vma_migratable+0x1c/0xd0 [323676.067122] lr : task_numa_work+0x1ec/0x4e0 [323676.067127] sp : ffff8000ada73d20 [323676.067128] x29: ffff8000ada73d20 x28: 0000000000000000 x27: 000000003e89f010 [323676.067130] x26: 0000000000080000 x25: ffff800081b5c0d8 x24: ffff800081b27000 [323676.067133] x23: 0000000000010000 x22: 0000000104d18cc0 x21: ffff0009f7158000 [323676.067135] x20: 0000000000000000 x19: 0000000000000000 x18: ffff8000ada73db8 [323676.067138] x17: 0001400000000000 x16: ffff800080df40b0 x15: 0000000000000035 [323676.067140] x14: ffff8000ada73cc8 x13: 1fffe0017cc72001 x12: ffff8000ada73cc8 [323676.067142] x11: ffff80008001160c x10: ffff000be639000c x9 : ffff8000800f4ba4 [323676.067145] x8 : ffff000810375000 x7 : ffff8000ada73974 x6 : 0000000000000001 [323676.067147] x5 : 0068000b33e26707 x4 : 0000000000000001 x3 : ffff0009f7158000 [323676.067149] x2 : 0000000000000041 x1 : 0000000000004400 x0 : 0000000000000000 [323676.067152] Call trace: [323676.067153] vma_migratable+0x1c/0xd0 [323676.067155] task_numa_work+0x1ec/0x4e0 [323676.067157] task_work_run+0x78/0xd8 [323676.067161] do_notify_resume+0x1ec/0x290 [323676.067163] el0_svc+0x150/0x160 [323676.067167] el0t_64_sync_handler+0xf8/0x128 [323676.067170] el0t_64_sync+0x17c/0x180 [323676.067173] Code: d2888001 910003fd f9000bf3 aa0003f3 (f9401000) [323676.067177] SMP: stopping secondary CPUs [323676.070184] Starting crashdump kernel... stress-ng-vm-segv in stress-ng is used to stress test the SIGSEGV error handling function of the system, which tries to cause a SIGSEGV error on return from unmapping the whole address space of the child process. Normally this program will not cause kernel crashes. But before the munmap system call returns to user mode, a potential task_numa_work() for numa balancing could be added and executed. In this scenario, since the child process has no vma after munmap, the vma_next() in task_numa_work() will return a null pointer even if the vma iterator restarts from 0. Recheck the vma pointer before dereferencing it in task_numa_work().

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

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CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  5.5 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

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Hyperlink	Resource
https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209	Patch
https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef	Patch
https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	NIST

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Change History

2 change records found show changes

Initial Analysis by NIST 11/13/2024 2:22:54 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.3 up to (excluding) 6.6.60 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.11.7 *cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-476
Changed	Reference Type	https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209 No Types Assigned	https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef No Types Assigned	https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef Patch
Changed	Reference Type	https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee No Types Assigned	https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee Patch

New CVE Received by NIST 11/09/2024 6:15:07 AM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 2662 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: sched/numa: Fix the potential null pointer dereference in task_numa_work() When running stress-ng-vm-segv test, we found a null pointer dereference error in task_numa_work(). Here is the backtrace: [323676.066985] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ...... [323676.067108] CPU: 35 PID: 2694524 Comm: stress-ng-vm-se ...... [323676.067113] pstate: 23401009 (nzCv daif +PA
Added	Reference		kernel.org https://git.kernel.org/stable/c/9c70b2a33cd2aa6a5a59c5523ef053bd42265209 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/ade91f6e9848b370add44d89c976e070ccb492ef [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/c60d98ef7078fc3e22b48e98eae7a897d88494ee [No types assigned]