CVE-2024-26665: tunnels: fix out of bounds access when building IPv6 PMTU error
Vulnerability summary
CVE-2024-26665 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 52.6% of scored vulnerabilities.
Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 23 · Related 18Timeline
- 02-04-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: tunnels: fix out of bounds access when building IPv6 PMTU error If the ICMPv6 error is built from a non-linear skb we get the following splat, BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0 Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HDiffers
- NVDNIST7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HDiffers
EPSS trend
Probability
0.68%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.68% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu104 products
- linux< 5.15.0-106.116
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1061.67
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.82-1 | < 6.7.7-1
- debian_linuxEOL10.0
Linux2 products
- linux≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < d964dd1bc1452594b4207d9229c157d9386e5d8a | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < e37cde7a5716466ff2a76f7f27f0a29b05b9a732 | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1 | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < 7dc9feb8b1705cf00de20563b6bc4831f4c99dab | ≥ 4cb47a8644cc9eb8ec81190a50e79e6530d0297f, < d75abeec401f8c86b470e7028a13fcdc87e5dd06 | 5.9
- linux_kernel≥ 5.9, < 5.10.210 | ≥ 5.11, < 5.15.149 | ≥ 5.16, < 6.1.78 | ≥ 6.2, < 6.6.17 | ≥ 6.7, < 6.7.5 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3
3 vendors · 108 products
