CVE-2025-39839
HIGH severity · CVSS 8.8 · Out-of-bounds read
8.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorAdjacent
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/1e36c6c8dc8023b4bbe9a16e819f9998b9b6a183 ↗
Additional information
- NVD record
- 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