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CVE-2021-47294— netrom: Decrease sock refcount when sock timers expire

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sock 引用计数将不平衡。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 26

VendorProduct Version RangeStatus
Linux Linux ce29e8a259de767f7210d346ad2b031cb8ab2732< 853262355518cd1247515b74e83fabf038aa6c29 affected
baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f< a01634bf91f2b6c42583770eb6815fb6d1e251cf affected
0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb< 48866fd5c361ea417ed24b43fc2a7dc2f5b060ef affected
2c6b572458a9127e8070df13fa7f115c29ab1d92< 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950 affected
63346650c1a94a92be61a57416ac88c0a47c4327< 25df44e90ff5959b5c24ad361b648504a7e39ef3 affected
63346650c1a94a92be61a57416ac88c0a47c4327< 6811744bd0efb9e472cb15d066cdb460beb8cb8a affected
63346650c1a94a92be61a57416ac88c0a47c4327< bc1660206c3723c37ed4d622ad81781f1e987250 affected
63346650c1a94a92be61a57416ac88c0a47c4327< 517a16b1a88bdb6b530f48d5d153478b2552d9a8 affected
… +18 more rows
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I. Basic Information for CVE-2021-47294

Vulnerability Information
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Vulnerability Title
netrom: Decrease sock refcount when sock timers expire
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.
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sock 引用计数将不平衡。
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 ce29e8a259de767f7210d346ad2b031cb8ab2732 ~ 853262355518cd1247515b74e83fabf038aa6c29 -
Linux Linux 5.0 -

II. Public POCs for CVE-2021-47294

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III. Intelligence Information for CVE-2021-47294

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Other References for CVE-2021-47294 (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-2021-47388 8.8 HIGH mac80211: fix use-after-free in CCMP/GCMP RX
CVE-2023-52798 8.8 HIGH wifi: ath11k: fix dfs radar event locking
CVE-2023-52801 8.8 HIGH iommufd: Fix missing update of domains_itree after splitting iopt_area
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-2021-47294

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