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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72157
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:33 UTC
Updated2026-08-23 13:16:40 UTC
DescriptionIn 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()").

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.003330000 probability, percentile 0.263800000 (date 2026-08-23)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e f96b3b35c622d565eff2438993e028d280163f5c git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e 6262f51e09d8dc8b07599a9e4f03bd3989d13fff git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e 569ba39b2d12995a29dc158e5b4de6e449278f30 git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e 2b3b4e5ff5a58ad32817824b0310e63908b12052 git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e e27beb4536cbf1d59e2d8c2840e87d972aba906f git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e e5824d5b841d99a2bcdd4e2c256643293bbc22c1 git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3 git Not specified
CNA Linux Linux affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e 55d9895f89970501fe126d1026b586b04a224c27 git Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 5.10.266 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.217 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.184 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/569ba39b2d12995a29dc158e5b4de6e449278f30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f96b3b35c622d565eff2438993e028d280163f5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6262f51e09d8dc8b07599a9e4f03bd3989d13fff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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