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CVE-2026-64218— batman-adv: bla: fix report_work leak on backbone_gw purge

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基金会开源的一款操作系统内核。 Linux kernel 3.5版本存在安全漏洞，该漏洞源于batadv_bla_purge_backbone_gw()函数在清理骨干网关条目时未正确处理关联的report_work，可能导致释放后重用和内存泄漏。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 23721387c409087fd3b97e274f34d3ddc0970b74< ce2c0ee4d76d5ee4b391fe0e31334361e25030ec affected
23721387c409087fd3b97e274f34d3ddc0970b74< 3423a45e5c3d3c5129f88143a9a969787d7d5a0a affected
23721387c409087fd3b97e274f34d3ddc0970b74< f1303adb1e59582f76c22798a2e2e150e054a9e7 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 48663158222b3b7f6ee6791a67d512ede7fc94bb affected
23721387c409087fd3b97e274f34d3ddc0970b74< eeddd7bab3d59c1e98642a204141f8c5d6194707 affected
23721387c409087fd3b97e274f34d3ddc0970b74< c6de1a5a9c406e30b91f1515a6ce05cc84023baa affected
23721387c409087fd3b97e274f34d3ddc0970b74< 95a7034661274cf5985708bd2f6d86ee46f88fa9 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 0459430add32ea41f3e2ef9351610e6d33627a6b affected
… +10 more rows
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I. Basic Information for CVE-2026-64218

Vulnerability Information
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Vulnerability Title
batman-adv: bla: fix report_work leak on backbone_gw purge
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: fix report_work leak on backbone_gw purge batadv_bla_purge_backbone_gw() removes stale backbone gateway entries, but fails to properly handle their associated report_work: - If report_work is running, the purge must wait for it to finish before freeing the backbone_gw, otherwise the worker may access freed memory (e.g. bat_priv). - If report_work is pending, the purge must cancel it and release the reference held for that pending work item. The previous implementation called hlist_for_each_entry_safe() inside a spin_lock_bh() section, but cancel_work_sync() may sleep and therefore cannot be called from within a spinlock-protected region. Restructure the loop to handle one entry per spinlock critical section: acquire the lock, find the next entry to purge, remove it from the hash list, then release the lock before calling cancel_work_sync() and dropping the hash_entry reference. Repeat until no more entries require purging.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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基金会开源的一款操作系统内核。 Linux kernel 3.5版本存在安全漏洞，该漏洞源于batadv_bla_purge_backbone_gw()函数在清理骨干网关条目时未正确处理关联的report_work，可能导致释放后重用和内存泄漏。
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 23721387c409087fd3b97e274f34d3ddc0970b74 ~ ce2c0ee4d76d5ee4b391fe0e31334361e25030ec -
Linux Linux 3.5 -

II. Public POCs for CVE-2026-64218

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III. Intelligence Information for CVE-2026-64218

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Patches & Fixes for CVE-2026-64218 (7)

Same Patch Batch · Linux · 2026-07-24 · 48 CVEs total

CVE-2026-64232 9.8 CRITICAL block: recompute nr_integrity_segments in blk_insert_cloned_request
CVE-2026-64216 9.8 CRITICAL netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
CVE-2026-64255 8.8 HIGH wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
CVE-2026-64247 8.4 HIGH KVM: x86: hyper-v: Bound the bank index when querying sparse banks
CVE-2026-64235 8.1 HIGH x86/ftrace: Relocate %rip-relative percpu refs in dynamic trampolines
CVE-2026-64223 8.1 HIGH wifi: mac80211: consume only present negotiated TTLM maps
CVE-2026-64251 7.8 HIGH pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()
CVE-2026-64226 7.8 HIGH sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
CVE-2026-64221 7.8 HIGH spi: ti-qspi: fix use-after-free after DMA setup failure
CVE-2026-64217 7.8 HIGH netfs: Fix overrun check in netfs_extract_user_iter()
CVE-2026-64210 7.5 HIGH net/mlx5e: xsk: Fix unlocked writing to ICOSQ
CVE-2026-64208 7.5 HIGH crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
CVE-2026-64243 7.1 HIGH ASoC: codecs: simple-mux: Fix enum control bounds check
CVE-2026-64222 7.0 HIGH octeontx2-pf: avoid double free of pool->stack on AQ init failure
CVE-2026-64219 7.0 HIGH drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_as
CVE-2026-64252 MIPS: DEC: Prevent initial console buffer from landing in XKPHYS
CVE-2026-64224 octeontx2-pf: fix double free in rvu_rep_rsrc_init()
CVE-2026-64250 LoongArch: Report dying CPU to RCU in stop_this_cpu()
CVE-2026-64248 MIPS: smp: report dying CPU to RCU in stop_this_cpu()
CVE-2026-64254 NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR

Showing top 20 of 48 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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