Updated: 2026-02-08 03:54:00.552771
Description:
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]. [pabeni@redhat.com: fixed subj typo]
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | HIGH | 7.1 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| RHEL 7 ELS | kernel | 3.10.0 | 7.1 | HIGH | Needs Triage | 2025-11-10 06:21:52 | ||
| TuxCare 9.6 ESU | kernel | 5.14.0 | 7.1 | HIGH | Already Fixed | 2025-12-08 17:55:41 | ||
| Ubuntu 16.04 ELS | linux-hwe | 4.15.0 | 7.1 | HIGH | In Testing | 2025-11-10 08:49:15 | ||
| Ubuntu 16.04 ELS | linux | 4.4.0 | 7.1 | HIGH | In Testing | 2025-11-10 16:15:03 | ||
| Ubuntu 18.04 ELS | linux | 4.15.0 | 7.1 | HIGH | In Testing | 2025-11-10 16:15:04 | ||
| Ubuntu 20.04 ELS | linux | 5.4.0 | 7.1 | HIGH | In Testing | 2025-11-10 16:15:03 |