CVE-2024-26665

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1daffected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < d964dd1bc1452594b4207d9229c157d9386e5d8aaffected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < e37cde7a5716466ff2a76f7f27f0a29b05b9a732affected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1affected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 7dc9feb8b1705cf00de20563b6bc4831f4c99dabaffected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < d75abeec401f8c86b470e7028a13fcdc87e5dd06affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux5.10.210 <= 5.10.*unaffected
LinuxLinux5.15.149 <= 5.15.*unaffected
LinuxLinux6.1.78 <= 6.1.*unaffected
LinuxLinux6.6.17 <= 6.6.*unaffected
LinuxLinux6.7.5 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References