ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down() As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()")) I think the synchronize_net() call in ipv6_mc_down() is not needed. Under load, synchronize_net() can last between 200 usec and 5 ms. KASAN seems to agree as well.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.13 and later | 5.15.153, 6.1.83, 6.6.23, 6.7.11, 6.8.2, 6.9 | Patch available | CNA |
- Linux VendorLinux Affected 5.13 and later Fixed in 5.15.153, 6.1.83, 6.6.23, 6.7.11, 6.8.2, 6.9 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.13 to before 5.15.153; 5.16 to before 6.1.83; 6.2 to before 6.6.23; 6.7 to before 6.7.11; 6.8 to before 6.8.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.13 to before 5.15.153; 5.16 to before 6.1.83; 6.2 to before 6.6.23; 6.7 to before 6.7.11; 6.8 to before 6.8.2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.153, 6.1.83, 6.6.23, 6.7.11, 6.8.2, 6.9
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
Not affected: 2 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2024-27390
- 2026-10-03 Alias added: GHSA-49cj-cqm8-6m92
References
Patch 6
- https://git.kernel.org/stable/c/9d159d6637ccce25f879d662a480541ef4ba3a50
- https://git.kernel.org/stable/c/a03ede2282ebbd181bd6f5c38cbfcb5765afcd04
- https://git.kernel.org/stable/c/26d4bac55750d535f1f0b8790dc26daf6089e373
- https://git.kernel.org/stable/c/7eb06ee5921189812e6b4bfe7b0f1e878be16df7
- https://git.kernel.org/stable/c/5da9a218340a2bc804dc4327e5804392e24a0b88
- https://git.kernel.org/stable/c/17ef8efc00b34918b966388b2af0993811895a8c
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2024-27390 · CVE Program
- CVE-2024-27390 · NVD
- FIRST EPSS
- GHSA-49cj-cqm8-6m92 · GitHub Advisory Database · CC BY 4.0
- CVE-2024-27390 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences