CVE-2026-46321tun: free page on short-frame rejection in tun_xdp_one()
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 6100e0237204890269e3f934acfc50d35fd6f319 builds before 0a6f46a9332ad6958992d64d3b3a81a80b2ca940; 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 builds before 0e8211fcf9426f5adddf32516ba0f400ceb9544d; from ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 before e915445942af6dcea628bf66d6241641201a0c41; from d5ad89b7d01ed4e66fd04734fc63d6e78536692a before 5b34f9e4fe2f203724a6e893d6df0316b9670057; 049584807f1d797fc3078b68035450a9769eb5c3 builds before 69863ff2720a0e9871f1a5710f2a33a94217fee0; 049584807f1d797fc3078b68035450a9769eb5c3 builds before 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0; 049584807f1d797fc3078b68035450a9769eb5c3 builds before 98c67be9eb9de72465a071949e84a3cdb8fab5a3; from 049584807f1d797fc3078b68035450a9769eb5c3 before f4feb1e20058e407cb00f45aff47f5b7e19a6bbf; and 10 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.4.281 before 5.5; from 5.10.223 before 5.10.259; from 5.15.164 before 5.15.210; from 6.1.102 before 6.1.176; from 6.6.43 before 6.6.143; from 6.9.12 before 6.10; from 6.10.2 before 6.12.93; from 6.13 before 6.18.35; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940patch
- https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544dpatch
- https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41patch
- https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057patch
- https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0patch
- https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0patch
- https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3patch
- https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbfpatch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.