CVE-2025-39839
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Linux Kernel
PublishedSep 19, 2025
First seenSep 19, 2025
How to fix
Update
- linux linux_kernel5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.10 ≤ v < 5.4.299, 5.5 ≤ v < 5.10.243, 5.11 ≤ v < 5.15.192, 5.16 ≤ v < 6.1.151, 6.2 ≤ v < 6.6.105, 6.7 ≤ v < 6.12.46, 6.13 ≤ v < 6.16.6, 6.17 | 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6 |
| debian debian_linux | 11.0 | — |
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