CVE-2025-37749net: ppp: Add bound checking for skb data on ppp_sync_txmung
- 8.2HighCVSS base score
- 0.40%Exploitation in 30 daysEPSS · top 65% 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: 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]
Timeline
ID reserved
By Linux
- 15 days later
· 15 days later
Published
- 15 months later
· 15 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 | High8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.40% · top 65% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 529401c8f12ecc35f9ea5d946d5a5596cf172b48
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < de5a4f0cba58625e88b7bebd88f780c8c0150997
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 99aa698dec342a07125d733e39aab4394b3b7e05
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b4c836d33ca888695b2f2665f948bc1b34fbd533
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1f6eb9fa87a781d5370c0de7794ae242f1a95ee5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < aabc6596ffb377c4c9c8f335124b92ea282c9821
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.4.293 – ≤ 5.4.*
- unaffected 5.10.237 – ≤ 5.10.*
- unaffected 5.15.181 – ≤ 5.15.*
- unaffected 6.1.135 – ≤ 6.1.*
- unaffected 6.6.88 – ≤ 6.6.*
- unaffected 6.12.24 – ≤ 6.12.*
- unaffected 6.13.12 – ≤ 6.13.*
- unaffected 6.14.3 – ≤ 6.14.*
- unaffected 6.15 – ≤ *
References
References11
- https://git.kernel.org/stable/c/529401c8f12ecc35f9ea5d946d5a5596cf172b48 (opens in a new tab)
- https://git.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997 (opens in a new tab)
- https://git.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05 (opens in a new tab)
- https://git.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca (opens in a new tab)
- https://git.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8 (opens in a new tab)
- https://git.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533 (opens in a new tab)
- https://git.kernel.org/stable/c/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5 (opens in a new tab)
- https://git.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e (opens in a new tab)
- https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.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-2025-13070 (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-2025-37749)Record last updated .