Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
eaea34b23c46bf17b4a5638be69ab3561854f34b to < ad715e713610d2d5473c3a6498c825ccecf26491affectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < 708e87937de93f445225c134a2e20519f9b4ce60affectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < 18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76affectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < 010eee265d6bd8769b6a523d2a0693d9b3f5df43affectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < 379d85c7f25f3e05a428225e6b8a65613c6e9b9daffectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < e098d9cc8859614a7f7baebc96e32a5a16b18ed2affectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < 0ada54ea63e48b9c1608e917ccb7dfadbe86db28affectedeaea34b23c46bf17b4a5638be69ab3561854f34b to < 447c9303942c439a117d9b76ce6d6e2116b38ee7affected
Linux Linux
Default version status: affected
4.6affected0 to < 4.6unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491 ↗
- https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60 ↗
- https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76 ↗
- https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43 ↗
- https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d ↗
- https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2 ↗
- https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28 ↗
- https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7 ↗