Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix OOB read/write in network-coding decode batadv_nc_skb_decode_packet() trusts coded_len and checks only against skb->len. XOR starts at sizeof(struct batadv_unicast_packet), reducing payload headroom, and the source skb length is not verified, allowing an out-of-bounds read and a small out-of-bounds write. Validate that coded_len fits within the payload area of both destination and source sk_buffs before XORing.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.10, < 5.4.299 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1e36c6c8dc8023b4bbe9a16e819f9998b9b6a183Patch
- https://git.kernel.org/stable/c/20080709457bc1e920eb002483d7d981d9b2ac1cPatch
- https://git.kernel.org/stable/c/30fc47248f02b8a14a61df469e1da4704be1a19fPatch
- https://git.kernel.org/stable/c/5d334bce9fad58cf328d8fa14ea1fff855819863Patch
- https://git.kernel.org/stable/c/a67c6397fcb7e842d3c595243049940970541c48Patch
- https://git.kernel.org/stable/c/bb37252c9af1cb250f34735ee98f80b46be3cef1Patch
- https://git.kernel.org/stable/c/d77b6ff0ce35a6d0b0b7b9581bc3f76d041d4087Patch
- https://git.kernel.org/stable/c/dce6c2aa70e94c04c523b375dfcc664d7a0a560aPatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing ListThird Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-089022.html
FAQ
What is CVE-2025-39839?
CVE-2025-39839 is a vulnerability with a CVSS score of 8.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix OOB read/write in network-coding decode batadv_nc_skb_decode_packet() trusts coded_len and checks only against skb...
How severe is CVE-2025-39839?
CVE-2025-39839 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-39839?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.