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CVE-2024-31076— genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于genirq/cpuhotplug,x86/vector模块存在问题。

AI Predicted 5.5 Difficulty: Hard EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< a40209d355afe4ed6d533507838c9e5cd70a76d8 affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< f5f4675960609d8c5ee95f027fbf6ce380f98372 affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< 6752dfcfff3ac3e16625ebd3f0ad9630900e7e76 affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< 9eeda3e0071a329af1eba15f4e57dc39576bb420 affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< e9c96d01d520498b169ce734a8ad1142bef86a30 affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< 59f86a2908380d09cdc726461c0fbb8d8579c99f affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< ebfb16fc057a016abb46a9720a54abf0d4f6abe1 affected
f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b< a6c11c0a5235fb144a65e0cb2ffd360ddc1f6c32 affected
… +10 more rows
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I. Basic Information for CVE-2024-31076

Vulnerability Information
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Vulnerability Title
genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline The absence of IRQD_MOVE_PCNTXT prevents immediate effectiveness of interrupt affinity reconfiguration via procfs. Instead, the change is deferred until the next instance of the interrupt being triggered on the original CPU. When the interrupt next triggers on the original CPU, the new affinity is enforced within __irq_move_irq(). A vector is allocated from the new CPU, but the old vector on the original CPU remains and is not immediately reclaimed. Instead, apicd->move_in_progress is flagged, and the reclaiming process is delayed until the next trigger of the interrupt on the new CPU. Upon the subsequent triggering of the interrupt on the new CPU, irq_complete_move() adds a task to the old CPU's vector_cleanup list if it remains online. Subsequently, the timer on the old CPU iterates over its vector_cleanup list, reclaiming old vectors. However, a rare scenario arises if the old CPU is outgoing before the interrupt triggers again on the new CPU. In that case irq_force_complete_move() is not invoked on the outgoing CPU to reclaim the old apicd->prev_vector because the interrupt isn't currently affine to the outgoing CPU, and irq_needs_fixup() returns false. Even though __vector_schedule_cleanup() is later called on the new CPU, it doesn't reclaim apicd->prev_vector; instead, it simply resets both apicd->move_in_progress and apicd->prev_vector to 0. As a result, the vector remains unreclaimed in vector_matrix, leading to a CPU vector leak. To address this issue, move the invocation of irq_force_complete_move() before the irq_needs_fixup() call to reclaim apicd->prev_vector, if the interrupt is currently or used to be affine to the outgoing CPU. Additionally, reclaim the vector in __vector_schedule_cleanup() as well, following a warning message, although theoretically it should never see apicd->move_in_progress with apicd->prev_cpu pointing to an offline CPU.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于genirq/cpuhotplug,x86/vector模块存在问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b ~ a40209d355afe4ed6d533507838c9e5cd70a76d8 -
Linux Linux 4.13 -

II. Public POCs for CVE-2024-31076

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III. Intelligence Information for CVE-2024-31076

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Mailing List Discussions for CVE-2024-31076 (1)

Other References for CVE-2024-31076 (8)

Same Patch Batch · Linux · 2024-06-21 · 40 CVEs total

CVE-2024-36288 9.8 CRITICAL SUNRPC: Fix loop termination condition in gss_free_in_token_pages()
CVE-2024-38381 8.8 HIGH nfc: nci: Fix uninit-value in nci_rx_work
CVE-2024-33619 7.8 HIGH efi: libstub: only free priv.runtime_map when allocated
CVE-2024-38628 7.8 HIGH usb: gadget: u_audio: Fix race condition use of controls after free during gadget unbind.
CVE-2024-36477 7.8 HIGH tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer
CVE-2024-38626 7.8 HIGH fuse: clear FR_SENT when re-adding requests into pending list
CVE-2024-36286 7.8 HIGH netfilter: nfnetlink_queue: acquire rcu_read_lock() in instance_destroy_rcu()
CVE-2024-38623 7.8 HIGH fs/ntfs3: Use variable length array instead of fixed size
CVE-2024-38635 7.8 HIGH soundwire: cadence: fix invalid PDI offset
CVE-2024-38388 7.8 HIGH ALSA: hda/cs_dsp_ctl: Use private_free for control cleanup
CVE-2024-38659 7.3 HIGH enic: Validate length of nl attributes in enic_set_vf_port
CVE-2024-36481 tracing/probes: fix error check in parse_btf_field()
CVE-2024-38662 bpf: Allow delete from sockmap/sockhash only if update is allowed
CVE-2024-38637 greybus: lights: check return of get_channel_from_mode
CVE-2024-38636 f2fs: multidev: fix to recognize valid zero block address
CVE-2024-38780 dma-buf/sw-sync: don't enable IRQ from sync_print_obj()
CVE-2024-39277 dma-mapping: benchmark: handle NUMA_NO_NODE correctly
CVE-2024-38634 serial: max3100: Lock port->lock when calling uart_handle_cts_change()
CVE-2024-34777 dma-mapping: benchmark: fix node id validation
CVE-2024-38633 serial: max3100: Update uart_driver_registered on driver removal

Showing top 20 of 40 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-31076

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