CVE-2026-72157net: thunderbolt: Fix frags[] overflow by bounding frame_count
- 8.8HighCVSS base score
- 0.35%Exploitation in 30 daysEPSS · top 70% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.35% · top 70% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < f96b3b35c622d565eff2438993e028d280163f5c
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < 6262f51e09d8dc8b07599a9e4f03bd3989d13fff
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < 569ba39b2d12995a29dc158e5b4de6e449278f30
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < 2b3b4e5ff5a58ad32817824b0310e63908b12052
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < e27beb4536cbf1d59e2d8c2840e87d972aba906f
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < e5824d5b841d99a2bcdd4e2c256643293bbc22c1
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3
- affected e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e – < 55d9895f89970501fe126d1026b586b04a224c27
- affected 4.15
- unaffected < 4.15
- unaffected 5.10.266 – ≤ 5.10.*
- unaffected 5.15.217 – ≤ 5.15.*
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/f96b3b35c622d565eff2438993e028d280163f5c (opens in a new tab)
- https://git.kernel.org/stable/c/6262f51e09d8dc8b07599a9e4f03bd3989d13fff (opens in a new tab)
- https://git.kernel.org/stable/c/569ba39b2d12995a29dc158e5b4de6e449278f30 (opens in a new tab)
- https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052 (opens in a new tab)
- https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f (opens in a new tab)
- https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1 (opens in a new tab)
- https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3 (opens in a new tab)
- https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-58915 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-72157)Record last updated .