DEBIAN-CVE-2017-1000112
Record from OSV · Published October 5, 2017
Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch. When building a UFO packet with MSG_MORE __ip_append_data() calls ip_ufo_append_data() to append. However in between two send() calls, the append path can be switched from UFO to non-UFO one, which leads to a memory corruption. In case UFO packet lengths exceeds MTU, copy = maxfraglen - skb->len becomes negative on the non-UFO path and the branch to allocate new skb is taken. This triggers fragmentation and computation of fraggap = skb_prev->len - maxfraglen. Fraggap can exceed MTU, causing copy = datalen - transhdrlen - fraggap to become negative. Subsequently skb_copy_and_csum_bits() writes out-of-bounds. A similar issue is present in IPv6 code. The bug was introduced in e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach") on Oct 18 2005.
Fixed versions
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| Package | Ecosystem | Fixed in |
|---|---|---|
| linux | Debian:13 | 4.12.6-1 |
| linux | Debian:14 | 4.12.6-1 |
| linux | Debian:12 | 4.12.6-1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:13 | linux | 0 |
| Debian:14 | linux | 0 |
| Debian:12 | linux | 0 |
Timeline
- Oct 5, 2017 CVE Published
- Sep 1, 2026 CVE Updated
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