Tracker / CVE-2025-37749
CVE-2025-37749
In the Linux kernel, the following vulnerability has been resolved: net: ppp: Add bound checking for skb data on ppp_sync_txmung Ensure we have enough data in linear buffer from skb before accessing initial bytes. This prevents potential out-of-bounds accesses when processing short packets. When ppp_sync_txmung receives an incoming package with an empty payload: (remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header) $18 = { type = 0x1, ver = 0x1, code = 0x0, sid = 0x2, length = 0x0, tag = 0xffff8880371cdb96 } from the skb struct (trimmed) tail = 0x16, end = 0x140, head = 0xffff88803346f400 "4", data = 0xffff88803346f416 ":\377", truesize = 0x380, len = 0x0, data_len = 0x0, mac_len = 0xe, hdr_len = 0x0, it is not safe to access data[2]. [[email protected]: fixed subj typo]
Affected products and versions
| debian | debian_linux |
|---|---|
| linux | linux_kernel |
| linux | linux_kernel · 2.6.13 → 5.4.293 |
| linux | linux_kernel · 5.11 → 5.15.181 |
| linux | linux_kernel · 5.16 → 6.1.135 |
| linux | linux_kernel · 5.5 → 5.10.237 |
| linux | linux_kernel · 6.13 → 6.13.12 |
| linux | linux_kernel · 6.14 → 6.14.3 |
| linux | linux_kernel · 6.2 → 6.6.88 |
| linux | linux_kernel · 6.7 → 6.12.24 |