CVE-2026-46321: linux
Vulnerability summary
CVE-2026-46321 is a high (CVSS 7.1) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 38 · Related 38Timeline
- 09-06-2026PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
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 metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- NVDNIST7.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS trend
Probability
0.13%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
0.00 pp
From 0.13% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu163 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 6100e0237204890269e3f934acfc50d35fd6f319, < 0a6f46a9332ad6958992d64d3b3a81a80b2ca940 | ≥ 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2, < 0e8211fcf9426f5adddf32516ba0f400ceb9544d | ≥ ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146, < e915445942af6dcea628bf66d6241641201a0c41 | ≥ d5ad89b7d01ed4e66fd04734fc63d6e78536692a, < 5b34f9e4fe2f203724a6e893d6df0316b9670057 | ≥ 049584807f1d797fc3078b68035450a9769eb5c3, < 69863ff2720a0e9871f1a5710f2a33a94217fee0 | ≥ 049584807f1d797fc3078b68035450a9769eb5c3, < 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0 | ≥ 049584807f1d797fc3078b68035450a9769eb5c3, < 98c67be9eb9de72465a071949e84a3cdb8fab5a3 | ≥ 049584807f1d797fc3078b68035450a9769eb5c3, < f4feb1e20058e407cb00f45aff47f5b7e19a6bbf | 32b0aaba5dbc85816898167d9b5d45a22eae82e9 | a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb | 8418f55302fa1d2eeb73e16e345167e545c598a5 | ≥ 5.10.223, < 5.10.259 | ≥ 5.15.164, < 5.15.210 | ≥ 6.1.102, < 6.1.176 | ≥ 6.6.43, < 6.6.143 | ≥ 5.4.281, < 5.5 | ≥ 6.9.12, < 6.10 | ≥ 6.10.2, < 6.11 | 6.11
- linux_kernel≥ 5.4.281, < 5.5 | ≥ 5.10.223, < 5.10.259 | ≥ 5.15.164, < 5.15.210 | ≥ 6.1.102, < 6.1.176 | ≥ 6.6.43, < 6.6.143 | ≥ 6.9.12, < 6.10 | ≥ 6.10.2, < 6.12.93 | ≥ 6.13, < 6.18.35 | ≥ 6.19, < 7.0.12 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
3 vendors · 166 products
