pptp: ensure minimal skb length in pptp_xmit()
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: pptp: ensure minimal skb length in pptp_xmit() Commit aabc6596ffb3 ("net: ppp: Add bound checking for skb data on ppp_sync_txmung") fixed ppp_sync_txmunge() We need a similar fix in pptp_xmit(), otherwise we might read uninit data as reported by syzbot. BUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline] ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314 pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x893/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.12 and later | 5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102, 6.12.42, 6.15.10, 6.16.1, 6.17 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.12 and later Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102, 6.12.42, 6.15.10, 6.16.1, 6.17 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 2.6.13 to before 5.4.297; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.148; 6.2 to before 6.6.102; 6.7 to before 6.12.42; 6.13 to before 6.15.10; 6.16 to before 6.16.1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* | 2.6.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* | 2.6.12 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* | 2.6.12 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* | 2.6.12 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* | 2.6.12 rc5 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.13 to before 5.4.297; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.148; 6.2 to before 6.6.102; 6.7 to before 6.12.42; 6.13 to before 6.15.10; 6.16 to before 6.16.1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* Versions 2.6.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* Versions 2.6.12 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* Versions 2.6.12 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* Versions 2.6.12 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* Versions 2.6.12 rc5 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.148, 6.6.102, 6.12.42, 6.15.10, 6.16.1, 6.17
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2025-38574
- 2026-10-03 Alias added: GHSA-39q5-4vqc-9p73
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
References
Patch 9
- https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f
- https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d
- https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c
- https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193
- https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611
- https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba
- https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb
- https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c
- https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b
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- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2025-38574 · CVE Program
- CVE-2025-38574 · NVD
- FIRST EPSS
- GHSA-39q5-4vqc-9p73 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-38574 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences