CVE-2021-47309

HighCVSS 7.1/10Last modified Aug 4, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

net: validate lwtstate->data before returning from skb_tunnel_info()

skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info type without validation. lwtstate->data can have various types such as mpls_iptunnel_encap, etc and these are not compatible. So skb_tunnel_info() should validate before returning that pointer.

Splat looks like: BUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan] Read of size 2 at addr ffff888106ec2698 by task ping/811

CPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195 Call Trace: dump_stack_lvl+0x56/0x7b print_address_description.constprop.8.cold.13+0x13/0x2ee ? vxlan_get_route+0x418/0x4b0 [vxlan] ? vxlan_get_route+0x418/0x4b0 [vxlan] kasan_report.cold.14+0x83/0xdf ? vxlan_get_route+0x418/0x4b0 [vxlan] vxlan_get_route+0x418/0x4b0 [vxlan] [ ... ] vxlan_xmit_one+0x148b/0x32b0 [vxlan] [ ... ] vxlan_xmit+0x25c5/0x4780 [vxlan] [ ... ] dev_hard_start_xmit+0x1ae/0x6e0 __dev_queue_xmit+0x1f39/0x31a0 [ ... ] neigh_xmit+0x2f9/0x940 mpls_xmit+0x911/0x1600 [mpls_iptunnel] lwtunnel_xmit+0x18f/0x450 ip_finish_output2+0x867/0x2040 [ ... ]

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness enumeration

CWE-125

Affected software

VendorProductVersions
LinuxLinux>= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < e7f3c9df40515a6c6b46f36c4c94cf48a043f887; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < b61d327cd3cc5ea591f3bf751dd11e034f388bb5; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < 83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < 8bb1589c89e61e3b182dd546f1021928ebb5c2a6; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < 8aa13a86964cdec4fd969ef677c6614ff068641a; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < 2179d96ec702cc33ead02a9ce40ece599b8538c5; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < a915379594f1e045421635c6316d8f3ffa018c58; >= 61adedf3e3f1d3f032c5a6a299978d91eff6d555, < 67a9c94317402b826fc3db32afc8f39336803d97
LinuxLinux4.3

References

Timeline

Published
May 21, 2024
Last modified
Aug 4, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-473107.8In the Linux kernel, the following vulnerability has been resolved: net: ti: fix UAF in tlan_remove_one priv is netdev private data and itCVE-2021-473117.8In the Linux kernel, the following vulnerability has been resolved: net: qcom/emac: fix UAF in emac_remove adpt is netdev private data andCVE-2021-473125.5In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix dereference of null pointer flow In the caseCVE-2021-473138.4In the Linux kernel, the following vulnerability has been resolved: cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init It's a cCVE-2021-473145.5In the Linux kernel, the following vulnerability has been resolved: memory: fsl_ifc: fix leak of private memory on probe failure On probe CVE-2021-473155.5In the Linux kernel, the following vulnerability has been resolved: memory: fsl_ifc: fix leak of IO mapping on probe failure On probe erroCVE-2021-473165.5In the Linux kernel, the following vulnerability has been resolved: nfsd: fix NULL dereference in nfs3svc_encode_getaclres In error cases CVE-2021-473173.3In the Linux kernel, the following vulnerability has been resolved: powerpc/bpf: Fix detecting BPF atomic instructions Commit 91c960b00566CVE-2021-473187.8In the Linux kernel, the following vulnerability has been resolved: arch_topology: Avoid use-after-free for scale_freq_data Currently topoCVE-2021-473195.5In the Linux kernel, the following vulnerability has been resolved: virtio-blk: Fix memory leak among suspend/resume procedure The vblk->vCVE-2021-473205.5In the Linux kernel, the following vulnerability has been resolved: nfs: fix acl memory leak of posix_acl_create() When looking into anothCVE-2021-473217.8In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free by calling del_timer_sync() This
CVE-2021-47309: High severity, CVSS 7.1 | Vulnix