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CVE-2022-48910— net: ipv6: ensure we call ipv6_mc_down() at most once

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，该漏洞源于在网络接口启用和禁用IPv6时可能重复调用ipv6_mc_down函数，造成内存泄漏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 9a8736b2da28b24f01707f592ff059b9f90a058c affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< c71bf3229f9e9dd60ba02f5a5be02066edf57012 affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 24888915364cfa410de62d8abb5df95c3b67455d affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 9588ac2eddc2f223ebcebf6e9f5caed84d32922b affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< f4c63b24dea9cc2043ff845dcca9aaf8109ea38a affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< b11781515208dd31fbcd0b664078dce5dc44523f affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 72124e65a70b84e6303a5cd21b0ac1f27d7d61a4 affected
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 9995b408f17ff8c7f11bc725c8aa225ba3a63b1c affected
… +10 more rows
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I. Basic Information for CVE-2022-48910

Vulnerability Information
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Vulnerability Title
net: ipv6: ensure we call ipv6_mc_down() at most once
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: ensure we call ipv6_mc_down() at most once There are two reasons for addrconf_notify() to be called with NETDEV_DOWN: either the network device is actually going down, or IPv6 was disabled on the interface. If either of them stays down while the other is toggled, we repeatedly call the code for NETDEV_DOWN, including ipv6_mc_down(), while never calling the corresponding ipv6_mc_up() in between. This will cause a new entry in idev->mc_tomb to be allocated for each multicast group the interface is subscribed to, which in turn leaks one struct ifmcaddr6 per nontrivial multicast group the interface is subscribed to. The following reproducer will leak at least $n objects: ip addr add ff2e::4242/32 dev eth0 autojoin sysctl -w net.ipv6.conf.eth0.disable_ipv6=1 for i in $(seq 1 $n); do ip link set up eth0; ip link set down eth0 done Joining groups with IPV6_ADD_MEMBERSHIP (unprivileged) or setting the sysctl net.ipv6.conf.eth0.forwarding to 1 (=> subscribing to ff02::2) can also be used to create a nontrivial idev->mc_list, which will the leak objects with the right up-down-sequence. Based on both sources for NETDEV_DOWN events the interface IPv6 state should be considered: - not ready if the network interface is not ready OR IPv6 is disabled for it - ready if the network interface is ready AND IPv6 is enabled for it The functions ipv6_mc_up() and ipv6_down() should only be run when this state changes. Implement this by remembering when the IPv6 state is ready, and only run ipv6_mc_down() if it actually changed from ready to not ready. The other direction (not ready -> ready) already works correctly, as: - the interface notification triggered codepath for NETDEV_UP / NETDEV_CHANGE returns early if ipv6 is disabled, and - the disable_ipv6=0 triggered codepath skips fully initializing the interface as long as addrconf_link_ready(dev) returns false - calling ipv6_mc_up() repeatedly does not leak anything
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，该漏洞源于在网络接口启用和禁用IPv6时可能重复调用ipv6_mc_down函数，造成内存泄漏。
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 3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36 ~ 9a8736b2da28b24f01707f592ff059b9f90a058c -
Linux Linux 3.18 -

II. Public POCs for CVE-2022-48910

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III. Intelligence Information for CVE-2022-48910

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Patches & Fixes for CVE-2022-48910 (1)

Other References for CVE-2022-48910 (7)

Same Patch Batch · Linux · 2024-08-22 · 42 CVEs total

CVE-2022-48941 8.8 HIGH ice: fix concurrent reset and removal of VFs
CVE-2022-48919 8.8 HIGH cifs: fix double free race when mount fails in cifs_get_root()
CVE-2022-48925 7.8 HIGH RDMA/cma: Do not change route.addr.src_addr outside state checks
CVE-2022-48923 7.8 HIGH btrfs: prevent copying too big compressed lzo segment
CVE-2022-48927 7.8 HIGH iio: adc: tsc2046: fix memory corruption by preventing array overflow
CVE-2022-48913 7.8 HIGH blktrace: fix use after free for struct blk_trace
CVE-2022-48912 7.8 HIGH netfilter: fix use-after-free in __nf_register_net_hook()
CVE-2022-48911 7.8 HIGH netfilter: nf_queue: fix possible use-after-free
CVE-2022-48932 7.8 HIGH net/mlx5: DR, Fix slab-out-of-bounds in mlx5_cmd_dr_create_fte
CVE-2022-48935 7.8 HIGH netfilter: nf_tables: unregister flowtable hooks on netns exit
CVE-2022-48940 7.8 HIGH bpf: Fix crash due to incorrect copy_map_value
CVE-2022-48943 7.1 HIGH KVM: x86/mmu: make apf token non-zero to fix bug
CVE-2022-48933 netfilter: nf_tables: fix memory leak during stateful obj update
CVE-2022-48934 nfp: flower: Fix a potential leak in nfp_tunnel_add_shared_mac()
CVE-2022-48937 io_uring: add a schedule point in io_add_buffers()
CVE-2022-48931 configfs: fix a race in configfs_{,un}register_subsystem()
CVE-2022-48930 RDMA/ib_srp: Fix a deadlock
CVE-2022-48929 bpf: Fix crash due to out of bounds access into reg2btf_ids.
CVE-2022-48928 iio: adc: men_z188_adc: Fix a resource leak in an error handling path
CVE-2022-48938 CDC-NCM: avoid overflow in sanity checking

Showing top 20 of 42 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48910

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