CVE-2026-46321

Summary

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

tun: free page on short-frame rejection in tun_xdp_one()

tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame in a batch leaks one page-frag chunk.

A local process that can open /dev/net/tun and /dev/vhost-net can hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning -EINVAL, matching the XDP-program error path in the same function.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6100e0237204890269e3f934acfc50d35fd6f319 < 0a6f46a9332ad6958992d64d3b3a81a80b2ca940affected
LinuxLinux589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 < 0e8211fcf9426f5adddf32516ba0f400ceb9544daffected
LinuxLinuxad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 < e915445942af6dcea628bf66d6241641201a0c41affected
LinuxLinuxd5ad89b7d01ed4e66fd04734fc63d6e78536692a < 5b34f9e4fe2f203724a6e893d6df0316b9670057affected
LinuxLinux049584807f1d797fc3078b68035450a9769eb5c3 < 69863ff2720a0e9871f1a5710f2a33a94217fee0affected
LinuxLinux049584807f1d797fc3078b68035450a9769eb5c3 < 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0affected
LinuxLinux049584807f1d797fc3078b68035450a9769eb5c3 < 98c67be9eb9de72465a071949e84a3cdb8fab5a3affected
LinuxLinux049584807f1d797fc3078b68035450a9769eb5c3 < f4feb1e20058e407cb00f45aff47f5b7e19a6bbfaffected
LinuxLinux32b0aaba5dbc85816898167d9b5d45a22eae82e9affected
LinuxLinuxa9d1c27e2ee3b0ea5d40c105d6e728fc114470bbaffected
LinuxLinux8418f55302fa1d2eeb73e16e345167e545c598a5affected
LinuxLinux5.10.223 < 5.10.259affected
LinuxLinux5.15.164 < 5.15.210affected
LinuxLinux6.1.102 < 6.1.176affected
LinuxLinux6.6.43 < 6.6.143affected
LinuxLinux5.4.281 < 5.5affected
LinuxLinux6.9.12 < 6.10affected
LinuxLinux6.10.2 < 6.11affected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References