Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc1 IPv6 Multicast ip6_mc_del1_src race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$0-$5k0.16

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc1. This affects the function ip6_mc_del1_src of the component IPv6 Multicast. Such manipulation leads to race condition. This vulnerability is traded as CVE-2026-98102. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc1. Affected by this issue is the function ip6_mc_del1_src of the component IPv6 Multicast. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-98102 since 09/25/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/25/2026).

Upgrading to version 6.12.111, 6.18.53, 7.2.7 or 7.3-rc2 eliminates this vulnerability. Applying the patch 4352737297b262e8367675c19a7dc6a9f53c97af/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4/5149c60c406595b56fda0c6e9aae7fd287f636aa/93b49239840b91313adbd77b8b52993eff2d08c1 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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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: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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 6.12.111/6.18.53/7.2.7/7.3-rc2
Patch: 4352737297b262e8367675c19a7dc6a9f53c97af/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4/5149c60c406595b56fda0c6e9aae7fd287f636aa/93b49239840b91313adbd77b8b52993eff2d08c1

Timelineinfo

09/25/2026 Advisory disclosed
09/25/2026 +0 days CVE reserved
09/25/2026 +0 days VulDB entry created
09/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98102 (🔒)
GCVE (CVE): GCVE-0-2026-98102
GCVE (VulDB): GCVE-100-409934

Entryinfo

Created: 09/25/2026 13:00
Changes: 09/25/2026 13:00 (59)
Complete: 🔍
Cache ID: 216::103

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