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CVE-2024-36899— gpiolib: cdev: Fix use after free in lineinfo_changed_notify

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 gpiolib:cdev 模块 lineinfo_changed_notify 中的释放后使用。

AI Predicted 4.4 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 51c1064e82e77b39a49889287ca50709303e2f26< 2dfbb920a89bdc58087672ad5325dc6c588b6860 affected
51c1064e82e77b39a49889287ca50709303e2f26< 2d008d4961b039d2edce8976289773961b7e5fb5 affected
51c1064e82e77b39a49889287ca50709303e2f26< d38c49f7bdf14381270736299e2ff68ec248a017 affected
51c1064e82e77b39a49889287ca50709303e2f26< 95ca7c90eaf5ea8a8460536535101e3e81160e2a affected
51c1064e82e77b39a49889287ca50709303e2f26< ca710b5f40b8b16fdcad50bebd47f50e4c62d239 affected
51c1064e82e77b39a49889287ca50709303e2f26< 02f6b0e1ec7e0e7d059dddc893645816552039da affected
5.7 affected
< 5.7 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-36899

Vulnerability Information
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Vulnerability Title
gpiolib: cdev: Fix use after free in lineinfo_changed_notify
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: gpiolib: cdev: Fix use after free in lineinfo_changed_notify The use-after-free issue occurs as follows: when the GPIO chip device file is being closed by invoking gpio_chrdev_release(), watched_lines is freed by bitmap_free(), but the unregistration of lineinfo_changed_nb notifier chain failed due to waiting write rwsem. Additionally, one of the GPIO chip's lines is also in the release process and holds the notifier chain's read rwsem. Consequently, a race condition leads to the use-after-free of watched_lines. Here is the typical stack when issue happened: [free] gpio_chrdev_release() --> bitmap_free(cdev->watched_lines) <-- freed --> blocking_notifier_chain_unregister() --> down_write(&nh->rwsem) <-- waiting rwsem --> __down_write_common() --> rwsem_down_write_slowpath() --> schedule_preempt_disabled() --> schedule() [use] st54spi_gpio_dev_release() --> gpio_free() --> gpiod_free() --> gpiod_free_commit() --> gpiod_line_state_notify() --> blocking_notifier_call_chain() --> down_read(&nh->rwsem); <-- held rwsem --> notifier_call_chain() --> lineinfo_changed_notify() --> test_bit(xxxx, cdev->watched_lines) <-- use after free The side effect of the use-after-free issue is that a GPIO line event is being generated for userspace where it shouldn't. However, since the chrdev is being closed, userspace won't have the chance to read that event anyway. To fix the issue, call the bitmap_free() function after the unregistration of lineinfo_changed_nb notifier chain.
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 gpiolib:cdev 模块 lineinfo_changed_notify 中的释放后使用。
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 51c1064e82e77b39a49889287ca50709303e2f26 ~ 2dfbb920a89bdc58087672ad5325dc6c588b6860 -
Linux Linux 5.7 -

II. Public POCs for CVE-2024-36899

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III. Intelligence Information for CVE-2024-36899

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Patches & Fixes for CVE-2024-36899 (3)

Other References for CVE-2024-36899 (3)

Same Patch Batch · Linux · 2024-05-30 · 93 CVEs total

CVE-2024-36958 9.8 CRITICAL NFSD: Fix nfsd4_encode_fattr4() crasher
CVE-2024-36886 9.8 CRITICAL tipc: fix UAF in error path
CVE-2024-36911 9.8 CRITICAL hv_netvsc: Don't free decrypted memory
CVE-2024-36912 9.6 CRITICAL Drivers: hv: vmbus: Track decrypted status in vmbus_gpadl
CVE-2024-36913 9.3 CRITICAL Drivers: hv: vmbus: Leak pages if set_memory_encrypted() fails
CVE-2024-36909 9.3 CRITICAL Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted
CVE-2024-36922 8.8 HIGH wifi: iwlwifi: read txq->read_ptr under lock
CVE-2024-36921 8.8 HIGH wifi: iwlwifi: mvm: guard against invalid STA ID on removal
CVE-2024-36910 8.4 HIGH uio_hv_generic: Don't free decrypted memory
CVE-2024-36032 8.1 HIGH Bluetooth: qca: fix info leak when fetching fw build id
CVE-2024-36933 7.8 HIGH nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment().
CVE-2024-36904 7.8 HIGH tcp: Use refcount_inc_not_zero() in tcp_twsk_unique().
CVE-2024-36914 7.8 HIGH drm/amd/display: Skip on writeback when it's not applicable
CVE-2024-36918 7.8 HIGH bpf: Check bloom filter map value size
CVE-2024-36018 7.8 HIGH nouveau/uvmm: fix addr/range calcs for remap operations
CVE-2024-36894 7.8 HIGH usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete
CVE-2024-36890 7.8 HIGH mm/slab: make __free(kfree) accept error pointers
CVE-2024-36940 7.8 HIGH pinctrl: core: delete incorrect free in pinctrl_enable()
CVE-2024-36928 7.8 HIGH s390/qeth: Fix kernel panic after setting hsuid
CVE-2024-36884 7.8 HIGH iommu/arm-smmu: Use the correct type in nvidia_smmu_context_fault()

Showing top 20 of 93 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36899

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