Linux Kernel up to 7.0.10 batman-adv batadv_bla_purge_backbone_gw use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.80

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.0.10. This affects the function batadv_bla_purge_backbone_gw of the component batman-adv. The manipulation results in use after free. This vulnerability is identified as CVE-2026-64218. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.0.10. It has been classified as very critical. Affected is the function batadv_bla_purge_backbone_gw of the component batman-adv. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-64218 since 07/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/24/2026).

Upgrading to version 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34 or 7.0.11 eliminates this vulnerability. Applying the patch ce2c0ee4d76d5ee4b391fe0e31334361e25030ec/3423a45e5c3d3c5129f88143a9a969787d7d5a0a/f1303adb1e59582f76c22798a2e2e150e054a9e7/48663158222b3b7f6ee6791a67d512ede7fc94bb/eeddd7bab3d59c1e98642a204141f8c5d6194707/c6de1a5a9c406e30b91f1515a6ce05cc84023baa/95a7034661274cf5985708bd2f6d86ee46f88fa9/0459430add32ea41f3e2ef9351610e6d33627a6b is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.258/5.15.209/6.1.175/6.6.142/6.12.92/6.18.34/7.0.11
Patch: ce2c0ee4d76d5ee4b391fe0e31334361e25030ec/3423a45e5c3d3c5129f88143a9a969787d7d5a0a/f1303adb1e59582f76c22798a2e2e150e054a9e7/48663158222b3b7f6ee6791a67d512ede7fc94bb/eeddd7bab3d59c1e98642a204141f8c5d6194707/c6de1a5a9c406e30b91f1515a6ce05cc84023baa/95a7034661274cf5985708bd2f6d86ee46f88fa9/0459430add32ea41f3e2ef9351610e6d33627a6b

Timelineinfo

07/19/2026 CVE reserved
07/24/2026 +5 days Advisory disclosed
07/24/2026 +0 days VulDB entry created
07/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64218 (🔒)
GCVE (CVE): GCVE-0-2026-64218
GCVE (VulDB): GCVE-100-382956

Entryinfo

Created: 07/24/2026 18:22
Changes: 07/24/2026 18:22 (59)
Complete: 🔍
Cache ID: 216::103

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