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CVE-2023-52486— drm: Don't unref the same fb many times by mistake due to deadlock handling

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，该漏洞源于在drm_mode_page_flip_ioctl 中查找fb会出现死锁情况。

CVSS 7.8 · High EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 29dc0d1de18239cf3ef8bab578b8321ed340d81c< 376e21a9e4c2c63ee5d8d3aa74be5082c3882229 affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< 9dd334a8245011ace45e53298175c7b659edb3e7 affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< f55261469be87c55df13db76dc945f6bcd825105 affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< b4af63da9d94986c529d74499fdfe44289acd551 affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< 62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0 affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< d7afdf360f4ac142832b098b4de974e867cc063c affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< bfd0feb1b109cb63b87fdcd00122603787c75a1a affected
29dc0d1de18239cf3ef8bab578b8321ed340d81c< cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c affected
… +10 more rows
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I. Basic Information for CVE-2023-52486

Vulnerability Information
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Vulnerability Title
drm: Don't unref the same fb many times by mistake due to deadlock handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm: Don't unref the same fb many times by mistake due to deadlock handling If we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl() we proceed to unref the fb and then retry the whole thing from the top. But we forget to reset the fb pointer back to NULL, and so if we then get another error during the retry, before the fb lookup, we proceed the unref the same fb again without having gotten another reference. The end result is that the fb will (eventually) end up being freed while it's still in use. Reset fb to NULL once we've unreffed it to avoid doing it again until we've done another fb lookup. This turned out to be pretty easy to hit on a DG2 when doing async flips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I saw that drm_closefb() simply got stuck in a busy loop while walking the framebuffer list. Fortunately I was able to convince it to oops instead, and from there it was easier to track down the culprit.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于在drm_mode_page_flip_ioctl 中查找fb会出现死锁情况。
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 29dc0d1de18239cf3ef8bab578b8321ed340d81c ~ 376e21a9e4c2c63ee5d8d3aa74be5082c3882229 -
Linux Linux 4.12 -

II. Public POCs for CVE-2023-52486

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III. Intelligence Information for CVE-2023-52486

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Mailing List Discussions for CVE-2023-52486 (2)

Other References for CVE-2023-52486 (8)

Same Patch Batch · Linux · 2024-02-29 · 53 CVEs total

CVE-2023-52480 9.8 CRITICAL ksmbd: fix race condition between session lookup and expire
CVE-2023-52478 8.8 HIGH HID: logitech-hidpp: Fix kernel crash on receiver USB disconnect
CVE-2023-52479 8.8 HIGH ksmbd: fix uaf in smb20_oplock_break_ack
CVE-2024-26620 8.2 HIGH s390/vfio-ap: always filter entire AP matrix
CVE-2024-26617 7.8 HIGH fs/proc/task_mmu: move mmu notification mechanism inside mm lock
CVE-2023-52483 7.8 HIGH mctp: perform route lookups under a RCU read-side lock
CVE-2021-47061 7.8 HIGH KVM: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU
CVE-2021-47060 7.8 HIGH KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
CVE-2023-52491 7.8 HIGH media: mtk-jpeg: Fix use after free bug due to error path handling in mtk_jpeg_dec_device_
CVE-2024-26608 7.8 HIGH ksmbd: fix global oob in ksmbd_nl_policy
CVE-2024-26610 7.8 HIGH wifi: iwlwifi: fix a memory corruption
CVE-2024-26614 7.8 HIGH tcp: make sure init the accept_queue's spinlocks once
CVE-2021-47068 7.8 HIGH net/nfc: fix use-after-free llcp_sock_bind/connect
CVE-2024-26611 7.5 HIGH xsk: fix usage of multi-buffer BPF helpers for ZC XDP
CVE-2023-52497 7.1 HIGH erofs: fix lz4 inplace decompression
CVE-2021-47066 7.1 HIGH async_xor: increase src_offs when dropping destination page
CVE-2021-47055 7.1 HIGH mtd: require write permissions for locking and badblock ioctls
CVE-2021-47016 m68k: mvme147,mvme16x: Don't wipe PCC timer config bits
CVE-2021-47065 rtw88: Fix array overrun in rtw_get_tx_power_params()
CVE-2021-47067 soc/tegra: regulators: Fix locking up when voltage-spread is out of range

Showing top 20 of 53 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52486

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