CVE-2026-81000High· 7.8▾ MidnightPoC availableIn the Linux kernel, the following vulnerability has been resolved: net: tun: bound receive headroom tun_get_user() uses tun->align both as skb headroom and when choosing how much packet data to keep linear. OVS can propagate an oversi…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 42.9 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 6.4
none → medium
— → 6.4
none → medium
— → 7.8
none → high
7.8 → 6.4
high → medium
3 GitHub repos
7.8 → 7
7 → 7.8
0.2% → 0.4%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
net: tun: bound receive headroom
tun_get_user() uses tun->align both as skb headroom and when choosing how much packet data to keep linear. OVS can propagate an oversized headroom request from another port to TUN or TAP.
When align is larger than the usable space in a one-page skb head, SKB_MAX_HEAD(align) underflows and the result becomes negative when stored in good_linear. That value later wraps when assigned to the size_t linear variable, and tun_alloc_skb() can place skb->data outside the allocated head.
Bound the headroom stored by TUN to the one-page skb-head budget and the largest non-sentinel 16-bit skb header offset. Leave one linear byte for raw TUN and a complete Ethernet header for TAP, including NET_IP_ALIGN.
Also pull the raw-TUN protocol byte and the TAP Ethernet header before accessing them, so these checks remain safe for nonlinear skbs supplied by other allocation paths.
Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < ad715e713610d2d5473c3a6498c825ccecf26491Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < 708e87937de93f445225c134a2e20519f9b4ce60Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < 18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < 010eee265d6bd8769b6a523d2a0693d9b3f5df43Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < 379d85c7f25f3e05a428225e6b8a65613c6e9b9dLinux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < e098d9cc8859614a7f7baebc96e32a5a16b18ed2Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < 0ada54ea63e48b9c1608e917ccb7dfadbe86db28Linux >= eaea34b23c46bf17b4a5638be69ab3561854f34b < 447c9303942c439a117d9b76ce6d6e2116b38ee7Linux 4.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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