CVE-2025-38574pptp: ensure minimal skb length in pptp_xmit()
- 8.6HighCVSS base score
- 0.41%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
- 4 months later
· 4 months later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.41% · top 64% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 97b8c5d322c5c0038cac4bc56fdbe237d0be426f
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 26672f1679b143aa34fca0b6046b7fd0c184770d
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5de7513f38f3c19c0610294ee478242bea356f8c
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 504cc4ab91073d2ac7404ad146139f86ecee7193
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 5005d24377378a20e5c0e53052fc4ebdcdcbc611
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ea99b88b1999ebcb24d5d3a6b7910030f40d3bba
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b7dcda76fd0615c0599c89f36873a6cd48e02dbb
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1a04db0fd75cb6034fc27a56b67b3b8b9022a98c
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < de9c4861fb42f0cd72da844c3c34f692d5895b7b
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.4.297 – ≤ 5.4.*
- unaffected 5.10.241 – ≤ 5.10.*
- unaffected 5.15.190 – ≤ 5.15.*
- unaffected 6.1.148 – ≤ 6.1.*
- unaffected 6.6.102 – ≤ 6.6.*
- unaffected 6.12.42 – ≤ 6.12.*
- unaffected 6.15.10 – ≤ 6.15.*
- unaffected 6.16.1 – ≤ 6.16.*
- unaffected 6.17 – ≤ *
References
References11
- https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f (opens in a new tab)
- https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d (opens in a new tab)
- https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c (opens in a new tab)
- https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193 (opens in a new tab)
- https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611 (opens in a new tab)
- https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba (opens in a new tab)
- https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb (opens in a new tab)
- https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c (opens in a new tab)
- https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-26101 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-38574)Record last updated .