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CVE-2022-49821— mISDN: fix possible memory leak in mISDN_dsp_element_register()

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mISDN_dsp_element_register中未正确释放设备引用，可能导致内存泄漏。

AI Predicted 3.3 Difficulty: Theoretical EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1fa5ae857bb14f6046205171d98506d8112dd74e< bbd53d05c4c892080ef3b617eff4f57903acecb9 affected
1fa5ae857bb14f6046205171d98506d8112dd74e< b119bedbefb7dd9ed8bf8cb9f1056504250d610e affected
1fa5ae857bb14f6046205171d98506d8112dd74e< 727ed7d28348c026c7ef4d852f3d0e5054d376e8 affected
1fa5ae857bb14f6046205171d98506d8112dd74e< 0f2c681900a01e3f23789bca26d88268c3d5b51d affected
1fa5ae857bb14f6046205171d98506d8112dd74e< 083a2c9ef82e184bdf0b9f9a1e5fc38d32afbb47 affected
1fa5ae857bb14f6046205171d98506d8112dd74e< 7a05e3929668c8cfef495c69752a9e91fac4878f affected
1fa5ae857bb14f6046205171d98506d8112dd74e< d4b8394725079670be309f9a35ad88a8cbbaaefd affected
1fa5ae857bb14f6046205171d98506d8112dd74e< 98a2ac1ca8fd6eca6867726fe238d06e75eb1acd affected
… +10 more rows
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I. Basic Information for CVE-2022-49821

Vulnerability Information
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Vulnerability Title
mISDN: fix possible memory leak in mISDN_dsp_element_register()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible memory leak in mISDN_dsp_element_register() Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array"), the name of device is allocated dynamically, use put_device() to give up the reference, so that the name can be freed in kobject_cleanup() when the refcount is 0. The 'entry' is going to be freed in mISDN_dsp_dev_release(), so the kfree() is removed. list_del() is called in mISDN_dsp_dev_release(), so it need be initialized.
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mISDN_dsp_element_register中未正确释放设备引用，可能导致内存泄漏。
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 1fa5ae857bb14f6046205171d98506d8112dd74e ~ bbd53d05c4c892080ef3b617eff4f57903acecb9 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2022-49821

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III. Intelligence Information for CVE-2022-49821

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Patches & Fixes for CVE-2022-49821 (7)

Other References for CVE-2022-49821 (1)

Same Patch Batch · Linux · 2025-05-01 · 245 CVEs total

CVE-2025-37750 9.8 CRITICAL smb: client: fix UAF in decryption with multichannel
CVE-2025-37778 9.8 CRITICAL ksmbd: Fix dangling pointer in krb_authenticate
CVE-2022-49770 9.8 CRITICAL ceph: avoid putting the realm twice when decoding snaps fails
CVE-2022-49931 8.8 HIGH IB/hfi1: Correctly move list in sc_disable()
CVE-2025-37776 8.8 HIGH ksmbd: fix use-after-free in smb_break_all_levII_oplock()
CVE-2025-37777 8.8 HIGH ksmbd: fix use-after-free in __smb2_lease_break_noti()
CVE-2025-37790 8.8 HIGH net: mctp: Set SOCK_RCU_FREE
CVE-2022-49910 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free caused by l2cap_reassemble_sdu
CVE-2022-49886 8.4 HIGH x86/tdx: Panic on bad configs that #VE on "private" memory access
CVE-2025-23159 8.4 HIGH media: venus: hfi: add a check to handle OOB in sfr region
CVE-2025-37749 8.2 HIGH net: ppp: Add bound checking for skb data on ppp_sync_txmung
CVE-2025-37774 7.8 HIGH slab: ensure slab->obj_exts is clear in a newly allocated slab page
CVE-2025-37789 7.8 HIGH net: openvswitch: fix nested key length validation in the set() action
CVE-2025-37779 7.8 HIGH lib/iov_iter: fix to increase non slab folio refcount
CVE-2022-49920 7.8 HIGH netfilter: nf_tables: netlink notifier might race to release objects
CVE-2022-49919 7.8 HIGH netfilter: nf_tables: release flow rule object from commit path
CVE-2025-37756 7.8 HIGH net: tls: explicitly disallow disconnect
CVE-2025-37761 7.8 HIGH drm/xe: Fix an out-of-bounds shift when invalidating TLB
CVE-2025-37763 7.8 HIGH drm/imagination: take paired job reference
CVE-2025-23141 7.8 HIGH KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses

Showing top 20 of 245 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-49821

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