CVE-2021-47321— watchdog: Fix possible use-after-free by calling del_timer_sync()
Affected Version Matrix 20
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2021-47321
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2021-47432 | lib/generic-radix-tree.c: Don't overflow in peek() | |
| CVE-2023-52760 | gfs2: Fix slab-use-after-free in gfs2_qd_dealloc | |
| CVE-2023-52757 | smb: client: fix potential deadlock when releasing mids | |
| CVE-2023-52755 | ksmbd: fix slab out of bounds write in smb_inherit_dacl() | |
| CVE-2023-52754 | media: imon: fix access to invalid resource for the second interface | |
| CVE-2023-52753 | drm/amd/display: Avoid NULL dereference of timing generator | |
| CVE-2023-52752 | smb: client: fix use-after-free bug in cifs_debug_data_proc_show() | |
| CVE-2023-52751 | smb: client: fix use-after-free in smb2_query_info_compound() | |
| CVE-2023-52750 | arm64: Restrict CPU_BIG_ENDIAN to GNU as or LLVM IAS 15.x or newer | |
| CVE-2023-52749 | spi: Fix null dereference on suspend | |
| CVE-2023-52748 | f2fs: avoid format-overflow warning | |
| CVE-2022-48710 | drm/radeon: fix a possible null pointer dereference | |
| CVE-2023-52742 | net: USB: Fix wrong-direction WARNING in plusb.c | |
| CVE-2023-52738 | drm/amdgpu/fence: Fix oops due to non-matching drm_sched init/fini | |
| CVE-2023-52740 | powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch | |
| CVE-2023-52739 | Fix page corruption caused by racy check in __free_pages | |
| CVE-2023-52741 | cifs: Fix use-after-free in rdata->read_into_pages() | |
| CVE-2023-52743 | ice: Do not use WQ_MEM_RECLAIM flag for workqueue | |
| CVE-2023-52746 | xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr() | |
| CVE-2023-52747 | IB/hfi1: Restore allocated resources on failed copyout |
Showing top 20 of 361 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-46300
net: skbuff: preserve shared-frag marker during coalescing - CVE-2026-43503
net: skbuff: propagate shared-frag marker through frag-trans - CVE-2026-43502
net/rds: handle zerocopy send cleanup before the message is - CVE-2026-43501
ipv6: rpl: reserve mac_len headroom when recompressed SRH gr - CVE-2026-43498
accel/ivpu: Disallow re-exporting imported GEM objects
Same vendor: Linux
- CVE-2026-46300
net: skbuff: preserve shared-frag marker during coalescing - CVE-2026-43503
net: skbuff: propagate shared-frag marker through frag-trans - CVE-2026-43502
net/rds: handle zerocopy send cleanup before the message is - CVE-2026-43501
ipv6: rpl: reserve mac_len headroom when recompressed SRH gr - CVE-2026-43498
accel/ivpu: Disallow re-exporting imported GEM objects
V. Comments for CVE-2021-47321
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