CVE-2026-72157High· 8.8▾ TwilightIn 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 sk…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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()").
Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < f96b3b35c622d565eff2438993e028d280163f5cLinux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 6262f51e09d8dc8b07599a9e4f03bd3989d13fffLinux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 569ba39b2d12995a29dc158e5b4de6e449278f30Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 2b3b4e5ff5a58ad32817824b0310e63908b12052Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e27beb4536cbf1d59e2d8c2840e87d972aba906fLinux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e5824d5b841d99a2bcdd4e2c256643293bbc22c1Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 55d9895f89970501fe126d1026b586b04a224c27Linux 4.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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