NVD

CVE-2024-41070 Detail

Modified

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group() Al reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group(). It looks up `stt` from tablefd, but then continues to use it after doing fdput() on the returned fd. After the fdput() the tablefd is free to be closed by another thread. The close calls kvm_spapr_tce_release() and then release_spapr_tce_table() (via call_rcu()) which frees `stt`. Although there are calls to rcu_read_lock() in kvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent the UAF, because `stt` is used outside the locked regions. With an artifcial delay after the fdput() and a userspace program which triggers the race, KASAN detects the UAF: BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505 CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1 Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV Call Trace: dump_stack_lvl+0xb4/0x108 (unreliable) print_report+0x2b4/0x6ec kasan_report+0x118/0x2b0 __asan_load4+0xb8/0xd0 kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] kvm_vfio_set_attr+0x524/0xac0 [kvm] kvm_device_ioctl+0x144/0x240 [kvm] sys_ioctl+0x62c/0x1810 system_call_exception+0x190/0x440 system_call_vectored_common+0x15c/0x2ec ... Freed by task 0: ... kfree+0xec/0x3e0 release_spapr_tce_table+0xd4/0x11c [kvm] rcu_core+0x568/0x16a0 handle_softirqs+0x23c/0x920 do_softirq_own_stack+0x6c/0x90 do_softirq_own_stack+0x58/0x90 __irq_exit_rcu+0x218/0x2d0 irq_exit+0x30/0x80 arch_local_irq_restore+0x128/0x230 arch_local_irq_enable+0x1c/0x30 cpuidle_enter_state+0x134/0x5cc cpuidle_enter+0x6c/0xb0 call_cpuidle+0x7c/0x100 do_idle+0x394/0x410 cpu_startup_entry+0x60/0x70 start_secondary+0x3fc/0x410 start_secondary_prolog+0x10/0x14 Fix it by delaying the fdput() until `stt` is no longer in use, which is effectively the entire function. To keep the patch minimal add a call to fdput() at each of the existing return paths. Future work can convert the function to goto or __cleanup style cleanup. With the fix in place the test case no longer triggers the UAF.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

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: 7.8 HIGH

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0	CVE, kernel.org	Patch
https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a	CVE, kernel.org	Patch
https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf	CVE, kernel.org	Patch
https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe	CVE, kernel.org	Patch
https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63	CVE, kernel.org	Patch
https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47	CVE, kernel.org	Patch
https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491	CVE, kernel.org	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

CVE Modified by CVE 11/21/2024 4:32:11 AM

Action	Type	New Value
Added	Reference	https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0
Added	Reference	https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a
Added	Reference	https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf
Added	Reference	https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe
Added	Reference	https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63
Added	Reference	https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47
Added	Reference	https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491

Initial Analysis by NIST 8/22/2024 10:05:32 AM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-416
Added	CPE Configuration		OR cpe:2.3:o:linux:linux_kernel::::::::* versions up to (excluding) 5.4.281 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.5 up to (excluding) 5.10.223 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.11 up to (excluding) 5.15.164 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.16 up to (excluding) 6.1.101 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.42 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.9.11
Changed	Reference Type	https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0 No Types Assigned	https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a No Types Assigned	https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a Patch
Changed	Reference Type	https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf No Types Assigned	https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf Patch
Changed	Reference Type	https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe No Types Assigned	https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe Patch
Changed	Reference Type	https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63 No Types Assigned	https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47 No Types Assigned	https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491 No Types Assigned	https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491 Patch

New CVE Received from kernel.org 7/29/2024 11:15:14 AM

Action	Type	New Value
Added	Description	Record truncated, showing 2048 of 2387 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: KVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group() Al reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group(). It looks up `stt` from tablefd, but then continues to use it after doing fdput() on the returned fd. After the fdput() the tablefd is free to be closed by another thread. The close calls kvm_spapr_tce_release() and then release_spapr_tce_table() (via call_rcu()) which frees `stt`. Although there are calls to rcu_read_lock() in kvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent the UAF, because `stt` is used outside the locked regions. With an artifcial delay after the fdput() and a userspace program which triggers the race, KASAN detects the UAF: BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505 CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1 Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV Call Trace: dump_stack_lvl+0xb4/0x108 (unreliable) print_report+0x2b4/0x6ec kasan_report+0x118/0x2b0 __asan_load4+0xb8/0xd0 kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] kvm_vfio_set_attr+0x524/0xac0 [kvm] kvm_device_ioctl+0x144/0x240 [kvm] sys_ioctl+0x62c/0x1810 system_call_exception+0x190/0x440 system_call_vectored_common+0x15c/0x2ec ... Freed by task 0: ... kfree+0xec/0x3e0 release_spapr_tce_table+0xd4/0x11c [kvm] rcu_core+0x568/0x16a0 handle_softirqs+0x23c/0x920 do_softirq_own_stack+0x6c/0x90 do_softirq_own_stack+0x58/0x90 __irq_exit_rcu+0x218/0x2d0 irq_exit+0x30/0x80 arch_local_irq_restore+0x128/0x230 arch_local_irq_enable+0x1c/0x30 cpuidle_enter_state+0x134/0x5cc cpuidle_enter+0x6c/0xb0 call_cpuidle+0x7c/0x100 do_idle+0x394/0x410 cpu_startup_entry+0x60/0x70 start_secondary+0x3fc/0x410 start_secondary_prolog+0
Added	Reference	kernel.org https://git.kernel.org/stable/c/4cdf6926f443c84f680213c7aafbe6f91a5fcbc0 [No types assigned]
Added	Reference	kernel.org https://git.kernel.org/stable/c/5f856023971f97fff74cfaf21b48ec320147b50a [No types assigned]
Added	Reference	kernel.org https://git.kernel.org/stable/c/82c7a4cf14aa866f8f7f09e662b02eddc49ee0bf [No types assigned]
Added	Reference	kernel.org https://git.kernel.org/stable/c/9975f93c760a32453d7639cf6fcf3f73b4e71ffe [No types assigned]
Added	Reference	kernel.org https://git.kernel.org/stable/c/a986fa57fd81a1430e00b3c6cf8a325d6f894a63 [No types assigned]
Added	Reference	kernel.org https://git.kernel.org/stable/c/b26c8c85463ef27a522d24fcd05651f0bb039e47 [No types assigned]
Added	Reference	kernel.org https://git.kernel.org/stable/c/be847bb20c809de8ac124431b556f244400b0491 [No types assigned]

Quick Info

CVE Dictionary Entry:
CVE-2024-41070
NVD Published Date:
07/29/2024
NVD Last Modified:
11/21/2024
Source:
kernel.org

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2024-41070 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by CVE 11/21/2024 4:32:11 AM

Initial Analysis by NIST 8/22/2024 10:05:32 AM

New CVE Received from kernel.org 7/29/2024 11:15:14 AM

Quick Info