Answer in brief
CVE-2026-72157 records a Unknown severity vulnerability in net: thunderbolt: Fix frags[] overflow by bounding frame_count. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <2b3b4e5ff5a58ad32817824b0310e63908b12052 || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <e27beb4536cbf1d59e2d8c2840e87d972aba906f || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <e5824d5b841d99a2bcdd4e2c256643293bbc22c1 || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3 || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <55d9895f89970501fe126d1026b586b04a224c27 | 2b3b4e5ff5a58ad32817824b0310e63908b12052, e27beb4536cbf1d59e2d8c2840e87d972aba906f, e5824d5b841d99a2bcdd4e2c256643293bbc22c1, fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3, 55d9895f89970501fe126d1026b586b04a224c27 |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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()").
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-72157 records a Unknown severity vulnerability in net: thunderbolt: Fix frags[] overflow by bounding frame_count. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <2b3b4e5ff5a58ad32817824b0310e63908b12052 || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <e27beb4536cbf1d59e2d8c2840e87d972aba906f || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <e5824d5b841d99a2bcdd4e2c256643293bbc22c1 || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3 || >=e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e <55d9895f89970501fe126d1026b586b04a224c27 | 2b3b4e5ff5a58ad32817824b0310e63908b12052, e27beb4536cbf1d59e2d8c2840e87d972aba906f, e5824d5b841d99a2bcdd4e2c256643293bbc22c1, fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3, 55d9895f89970501fe126d1026b586b04a224c27 |
| Linux/Linuxgeneric | 4.15 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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()").
Quoted source text, attributed separately from HOL analysis.