Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-72157

net: thunderbolt: Fix frags[] overflow by bounding frame_count

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.266, 5.15.217, 6.1.184, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Fix frags[] overflow by bounding frame_count tbnet_poll() assembles a multi-frame ThunderboltIP packet into one skb. The first frame goes into the skb linear area and every further frame is added as a page fragment. skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, hdr_size, frame_size, TBNET_RX_PAGE_SIZE - hdr_size); A packet of frame_count frames therefore ends up with frame_count - 1 fragments. tbnet_check_frame() only bounds the peer supplied frame_count to TBNET_RING_SIZE / 4 (64), which is far above MAX_SKB_FRAGS (17 by default). A peer that sends a packet of 19 or more small frames pushes nr_frags past MAX_SKB_FRAGS, so skb_add_rx_frag() writes past skb_shinfo()->frags[] and corrupts memory after the shared info. Tighten the start of packet bound to MAX_SKB_FRAGS + 1 so a packet can never produce more fragments than frags[] can hold. This matches the recent skb frags overflow fixes in other receive paths, for example f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") and 600dc40554dc ("net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()").

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in f96b3b35c622d565eff2438993e028d280163f5c; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in 6262f51e09d8dc8b07599a9e4f03bd3989d13fff; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in 569ba39b2d12995a29dc158e5b4de6e449278f30; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in 2b3b4e5ff5a58ad32817824b0310e63908b12052; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in e27beb4536cbf1d59e2d8c2840e87d972aba906f; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in e5824d5b841d99a2bcdd4e2c256643293bbc22c1; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3; From e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e · fixed in 55d9895f89970501fe126d1026b586b04a224c27

  • Linux Linux

    4.15

  • KernelLinux

    From 4.15.0 · fixed in 5.10.266; From 5.11.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org