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CVE-2022-48809— net: fix a memleak when uncloning an skb dst and its metadata

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net模块在处理skb的dst和元数据克隆时，由于引用计数问题导致内存泄漏。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fc4099f17240767554ff3a73977acb78ef615404< 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 affected
fc4099f17240767554ff3a73977acb78ef615404< c1ff27d100e2670b03cbfddb9117e5f9fc672540 affected
fc4099f17240767554ff3a73977acb78ef615404< 0be943916d781df2b652793bb2d3ae4f9624c10a affected
fc4099f17240767554ff3a73977acb78ef615404< a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 affected
fc4099f17240767554ff3a73977acb78ef615404< 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 affected
fc4099f17240767554ff3a73977acb78ef615404< fdcb263fa5cda15b8cb24a641fa2718c47605314 affected
fc4099f17240767554ff3a73977acb78ef615404< 8b1087b998e273f07be13dcb5f3ca4c309c7f108 affected
fc4099f17240767554ff3a73977acb78ef615404< 9eeabdf17fa0ab75381045c867c370f4cc75a613 affected
… +10 more rows
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I. Basic Information for CVE-2022-48809

Vulnerability Information
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Vulnerability Title
net: fix a memleak when uncloning an skb dst and its metadata
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.
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net模块在处理skb的dst和元数据克隆时，由于引用计数问题导致内存泄漏。
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 fc4099f17240767554ff3a73977acb78ef615404 ~ 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 -
Linux Linux 4.3 -

II. Public POCs for CVE-2022-48809

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III. Intelligence Information for CVE-2022-48809

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Other References for CVE-2022-48809 (6)

Same Patch Batch · Linux · 2024-07-16 · 98 CVEs total

CVE-2022-48790 9.8 CRITICAL nvme: fix a possible use-after-free in controller reset during load
CVE-2022-48789 9.8 CRITICAL nvme-tcp: fix possible use-after-free in transport error_recovery work
CVE-2022-48788 9.8 CRITICAL nvme-rdma: fix possible use-after-free in transport error_recovery work
CVE-2022-48851 9.8 CRITICAL staging: gdm724x: fix use after free in gdm_lte_rx()
CVE-2022-48829 9.1 CRITICAL NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes
CVE-2022-48828 9.1 CRITICAL NFSD: Fix ia_size underflow
CVE-2022-48864 8.8 HIGH vdpa/mlx5: add validation for VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET command
CVE-2022-48830 8.8 HIGH can: isotp: fix potential CAN frame reception race in isotp_rcv()
CVE-2022-48782 8.8 HIGH mctp: fix use after free
CVE-2022-48785 8.8 HIGH ipv6: mcast: use rcu-safe version of ipv6_get_lladdr()
CVE-2022-48786 7.8 HIGH vsock: remove vsock from connected table when connect is interrupted by a signal
CVE-2022-48839 7.8 HIGH net/packet: fix slab-out-of-bounds access in packet_recvmsg()
CVE-2022-48779 7.8 HIGH net: mscc: ocelot: fix use-after-free in ocelot_vlan_del()
CVE-2022-48821 7.8 HIGH misc: fastrpc: avoid double fput() on failed usercopy
CVE-2022-48822 7.8 HIGH usb: f_fs: Fix use-after-free for epfile
CVE-2022-48816 7.8 HIGH SUNRPC: lock against ->sock changing during sysfs read
CVE-2022-48792 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task
CVE-2022-48796 7.8 HIGH iommu: Fix potential use-after-free during probe
CVE-2022-48787 7.8 HIGH iwlwifi: fix use-after-free
CVE-2022-48791 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted TMF sas_task

Showing top 20 of 98 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48809

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