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CVE-2021-47321— watchdog: Fix possible use-after-free by calling del_timer_sync()

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，该漏洞源于内存释放后重用。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1047 · Windows Management Instrumentation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 7c25f8c9f67708e6464d2221bc311cbd99e950dc< 58606882ad8ec6c39e0f40344b922921ef94ab4d affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< ca96b8ea5e74956071154bdb456778cc3027e79f affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< 8bec568d7518b1504a602ed5376bb322e4dbb270 affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< ecd620e0fb1ff7f78fdb593379b2e6938c99707a affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< db222f1477ad5692cd454709b714949807e5d111 affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< 66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< 4c05dac488a660fe2925c047ecb119e7afaaeb1e affected
7c25f8c9f67708e6464d2221bc311cbd99e950dc< 1a053c4d716898a53c2e31c574a70ea0c37044a3 affected
… +12 more rows
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I. Basic Information for CVE-2021-47321

Vulnerability Information
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Vulnerability Title
watchdog: Fix possible use-after-free by calling del_timer_sync()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free by calling del_timer_sync() This driver's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
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，该漏洞源于内存释放后重用。
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 7c25f8c9f67708e6464d2221bc311cbd99e950dc ~ 58606882ad8ec6c39e0f40344b922921ef94ab4d -
Linux Linux 4.3 -

II. Public POCs for CVE-2021-47321

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III. Intelligence Information for CVE-2021-47321

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Patches & Fixes for CVE-2021-47321 (1)

Other References for CVE-2021-47321 (8)

Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total

CVE-2023-52732 9.8 CRITICAL ceph: blocklist the kclient when receiving corrupted snap trace
CVE-2023-52755 9.8 CRITICAL ksmbd: fix slab out of bounds write in smb_inherit_dacl()
CVE-2021-47328 9.8 CRITICAL scsi: iscsi: Fix conn use after free during resets
CVE-2023-52741 9.8 CRITICAL cifs: Fix use-after-free in rdata->read_into_pages()
CVE-2021-47378 9.8 CRITICAL nvme-rdma: destroy cm id before destroy qp to avoid use after free
CVE-2021-47232 9.8 CRITICAL can: j1939: fix Use-after-Free, hold skb ref while in use
CVE-2021-47427 9.8 CRITICAL scsi: iscsi: Fix iscsi_task use after free
CVE-2023-52846 8.8 HIGH hsr: Prevent use after free in prp_create_tagged_frame()
CVE-2023-52801 8.8 HIGH iommufd: Fix missing update of domains_itree after splitting iopt_area
CVE-2023-52798 8.8 HIGH wifi: ath11k: fix dfs radar event locking
CVE-2021-47388 8.8 HIGH mac80211: fix use-after-free in CCMP/GCMP RX
CVE-2021-47390 8.8 HIGH KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()
CVE-2023-52790 8.8 HIGH swiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC
CVE-2023-52769 8.8 HIGH wifi: ath12k: fix htt mlo-offset event locking
CVE-2023-52776 8.8 HIGH wifi: ath12k: fix dfs-radar and temperature event locking
CVE-2021-47308 8.8 HIGH scsi: libfc: Fix array index out of bound exception
CVE-2023-52829 8.4 HIGH wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()
CVE-2021-47240 8.4 HIGH net: qrtr: fix OOB Read in qrtr_endpoint_post
CVE-2021-47352 8.4 HIGH virtio-net: Add validation for used length
CVE-2021-47244 8.2 HIGH mptcp: Fix out of bounds when parsing TCP options

Showing top 20 of 361 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47321

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