net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

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Summary

CVECVE-2026-31623
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:41 UTC
Updated2026-06-01 17:16:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete() A malicious USB device claiming to be a CDC Phonet modem can overflow the skb_shared_info->frags[] array by sending an unbounded sequence of full-page bulk transfers. Drop the skb and increment the length error when the frag limit is reached. This matches the same fix that commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") did for the t7xx driver.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-120

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 6807ff49bf796b3823b1e29f97b69316a40a9a94 git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 0c5c65a17db729fc63ab656bdaaf0e675a9dbeac git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 6053620fdbcd89fa7e755644efdaab78e0daaae7 git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 d4e1946bea8d6441835eb3fd09b19237ba366a6f git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 a23b1b1aaf41e174181d5853a70e65d4d01e648c git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 c183d5775129a0a7495bd61a6e57ec230dcf01e5 git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 ebf75c6301c4972a87542ebf2d994c6391eb5d46 git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 9989938d13cc5ba8447eeed5a61acfcf61bc6801 git Not specified
CNA Linux Linux affected 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 600dc40554dc5ad1e6f3af51f700228033f43ea7 git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0c5c65a17db729fc63ab656bdaaf0e675a9dbeac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/600dc40554dc5ad1e6f3af51f700228033f43ea7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9989938d13cc5ba8447eeed5a61acfcf61bc6801 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ebf75c6301c4972a87542ebf2d994c6391eb5d46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d4e1946bea8d6441835eb3fd09b19237ba366a6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a23b1b1aaf41e174181d5853a70e65d4d01e648c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6807ff49bf796b3823b1e29f97b69316a40a9a94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c183d5775129a0a7495bd61a6e57ec230dcf01e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6053620fdbcd89fa7e755644efdaab78e0daaae7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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