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CVE-2026-80839— batman-adv: reject unrepresentable multicast TVLV offsets

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于batman-adv对接收到的多播TVLV结束偏移未进行可表示性检查，可能导致越界访问数据包缓冲区之外的内存。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 2 AI

T1010.001 T1210.001

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 07afe1ba288c04280622fa002ed385f1ac0b6fe6< da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2 affected
07afe1ba288c04280622fa002ed385f1ac0b6fe6< 916ec741e65af072b98e475feaad98c063da1b7c affected
07afe1ba288c04280622fa002ed385f1ac0b6fe6< 1b466746fe109127fd983100a228cdd1f1f6ece2 affected
07afe1ba288c04280622fa002ed385f1ac0b6fe6< 2b46baa591d0a7c16b62f150917187e70d053be6 affected
07afe1ba288c04280622fa002ed385f1ac0b6fe6< f12c2de4f542e3220e17e0606f492110064f04cb affected
6.8 affected
< 6.8 unaffected
6.12.108≤ 6.12.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80839

Vulnerability Information
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Vulnerability Title
batman-adv: reject unrepresentable multicast TVLV offsets
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: reject unrepresentable multicast TVLV offsets The network and transport header fields in struct sk_buff are 16-bit offsets from skb->head, and U16_MAX is reserved as the unset transport header value. batadv_tvlv_call_handler() sets both fields from a received multicast TVLV without checking whether the TVLV end is representable. If the end offset exceeds the field's range, skb_set_transport_header() truncates it so that the transport header precedes the network header. The negative difference is then returned by skb_network_header_len() as a large u32. batadv_mcast_forw_packet() consequently accepts an oversized multicast tracker and accesses memory beyond the skb data. Add skb_set_transport_header_careful(), an offset-aware counterpart to skb_reset_transport_header_careful(), which validates the final head-relative offset before assigning it. Use the new helper in batadv_tvlv_call_handler() and reject unrepresentable TVLVs before setting the network header.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于batman-adv对接收到的多播TVLV结束偏移未进行可表示性检查，可能导致越界访问数据包缓冲区之外的内存。
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 07afe1ba288c04280622fa002ed385f1ac0b6fe6 ~ da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-80839

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III. Intelligence Information for CVE-2026-80839

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Patches & Fixes for CVE-2026-80839 (5)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80839

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