CVE-2024-26665

tunnels: fix out of bounds access when building IPv6 PMTU error

HIGH

7.1

CVSS Score

Published: April 2, 2024 at 06:22 AM UTC

Updated: August 5, 2026 at 12:04 PM UTC

2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity

HIGH7.1

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

10.0

Linux Kernel · Linux

95%

5.11 ≤ v < 5.15.1495.16 ≤ v < 6.1.785.9 ≤ v < 5.10.2105.9 ≤ v < 5.15.1495.9 ≤ v < 6.1.785.9 ≤ v < 6.6.175.9 ≤ v < 6.7.55.9 ≤ v < 6.86.2 ≤ v < 6.6.176.7 ≤ v < 6.7.54cb47a8644cc9eb8ec81190a50e79e6530d0297f6.8 rc1 6.8 rc2 6.8 rc3

Vendor states this is fixed in 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1 (fixed)

Vendor states this is fixed in 7dc9feb8b1705cf00de20563b6bc4831f4c99dab (fixed)

Vendor states this is fixed in d75abeec401f8c86b470e7028a13fcdc87e5dd06 (fixed)

Vendor states this is fixed in d964dd1bc1452594b4207d9229c157d9386e5d8a (fixed)

Vendor states this is fixed in e37cde7a5716466ff2a76f7f27f0a29b05b9a732 (fixed)

Vendor states this is fixed in e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1d (fixed)

Vendor states this is fixed in 5.10.210 (unaffected)

Vendor states this is fixed in 5.15.149 (unaffected)

Vendor states this is fixed in 5.9 (unaffected)

Vendor states this is fixed in 6.1.78 (unaffected)

Vendor states this is fixed in 6.6.17 (unaffected)

Vendor states this is fixed in 6.7.5 (unaffected)