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CVE-2025-39839— batman-adv: fix OOB read/write in network-coding decode

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证coded_len长度，可能导致越界读取和越界写入。

CVSS 8.8 · High EPSS 0.26% · P17

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2df5278b0267c799f3e877e8eeddbb6e93cda0bb< 30fc47248f02b8a14a61df469e1da4704be1a19f affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< 1e36c6c8dc8023b4bbe9a16e819f9998b9b6a183 affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< 5d334bce9fad58cf328d8fa14ea1fff855819863 affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< dce6c2aa70e94c04c523b375dfcc664d7a0a560a affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< bb37252c9af1cb250f34735ee98f80b46be3cef1 affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< 20080709457bc1e920eb002483d7d981d9b2ac1c affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< a67c6397fcb7e842d3c595243049940970541c48 affected
2df5278b0267c799f3e877e8eeddbb6e93cda0bb< d77b6ff0ce35a6d0b0b7b9581bc3f76d041d4087 affected
… +10 more rows
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I. Basic Information for CVE-2025-39839

Vulnerability Information
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Vulnerability Title
batman-adv: fix OOB read/write in network-coding decode
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未验证coded_len长度，可能导致越界读取和越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2df5278b0267c799f3e877e8eeddbb6e93cda0bb ~ 30fc47248f02b8a14a61df469e1da4704be1a19f -
Linux Linux 3.10 -

II. Public POCs for CVE-2025-39839

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III. Intelligence Information for CVE-2025-39839

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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total

CVE-2025-39841 9.8 CRITICAL scsi: lpfc: Fix buffer free/clear order in deferred receive path
CVE-2025-39864 8.8 HIGH wifi: cfg80211: fix use-after-free in cmp_bss()
CVE-2025-39862 8.8 HIGH wifi: mt76: mt7915: fix list corruption after hardware restart
CVE-2025-39848 8.8 HIGH ax25: properly unshare skbs in ax25_kiss_rcv()
CVE-2025-39849 8.8 HIGH wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()
CVE-2025-39860 8.0 HIGH Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()
CVE-2025-39837 7.8 HIGH platform/x86: asus-wmi: Fix racy registrations
CVE-2025-39863 7.8 HIGH wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work
CVE-2025-39866 7.8 HIGH fs: writeback: fix use-after-free in __mark_inode_dirty()
CVE-2025-39854 7.8 HIGH ice: fix NULL access of tx->in_use in ice_ll_ts_intr
CVE-2025-39851 7.5 HIGH vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
CVE-2025-39857 7.5 HIGH net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()
CVE-2025-39840 7.1 HIGH audit: fix out-of-bounds read in audit_compare_dname_path()
CVE-2025-39846 pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region()
CVE-2025-39865 tee: fix NULL pointer dereference in tee_shm_put
CVE-2025-39838 cifs: prevent NULL pointer dereference in UTF16 conversion
CVE-2025-39861 Bluetooth: vhci: Prevent use-after-free by removing debugfs files early
CVE-2025-39842 ocfs2: prevent release journal inode after journal shutdown
CVE-2025-39844 mm: move page table sync declarations to linux/pgtable.h
CVE-2025-39843 mm: slub: avoid wake up kswapd in set_track_prepare

Showing top 20 of 30 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39839

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