net: wwan: t7xx: fix potential skb->frags overflow in RX path

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Summary

CVECVE-2026-23172
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-14 16:15:57 UTC
Updated2026-04-03 14:16:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: fix potential skb->frags overflow in RX path When receiving data in the DPMAIF RX path, the t7xx_dpmaif_set_frag_to_skb() function adds page fragments to an skb without checking if the number of fragments has exceeded MAX_SKB_FRAGS. This could lead to a buffer overflow in skb_shinfo(skb)->frags[] array, corrupting adjacent memory and potentially causing kernel crashes or other undefined behavior. This issue was identified through static code analysis by comparing with a similar vulnerability fixed in the mt76 driver commit b102f0c522cf ("mt76: fix array overflow on receiving too many fragments for a packet"). The vulnerability could be triggered if the modem firmware sends packets with excessive fragments. While under normal protocol conditions (MTU 3080 bytes, BAT buffer 3584 bytes), a single packet should not require additional fragments, the kernel should not blindly trust firmware behavior. Malicious, buggy, or compromised firmware could potentially craft packets with more fragments than the kernel expects. Fix this by adding a bounds check before calling skb_add_rx_frag() to ensure nr_frags does not exceed MAX_SKB_FRAGS. The check must be performed before unmapping to avoid a page leak and double DMA unmap during device teardown.

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

Problem Types: CWE-401

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 d642b012df70a76dd5723f2d426b40bffe83ac49 f9747a7521a48afded5bff2faf1f2dcfff48c577 git Not specified
CNA Linux Linux affected d642b012df70a76dd5723f2d426b40bffe83ac49 2a0522f564acd34442652ea083091c329fa7c5d5 git Not specified
CNA Linux Linux affected d642b012df70a76dd5723f2d426b40bffe83ac49 af4b8577d0b388cc3d0039eb0cdd9ca5bbbc9276 git Not specified
CNA Linux Linux affected d642b012df70a76dd5723f2d426b40bffe83ac49 2c0fb0f60bc1545c52da61bc6bd4855c1e7814ba git Not specified
CNA Linux Linux affected d642b012df70a76dd5723f2d426b40bffe83ac49 f0813bcd2d9d97fdbdf2efb9532ab03ae92e99e6 git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.162 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.123 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.69 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.9 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2c0fb0f60bc1545c52da61bc6bd4855c1e7814ba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f9747a7521a48afded5bff2faf1f2dcfff48c577 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/af4b8577d0b388cc3d0039eb0cdd9ca5bbbc9276 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2a0522f564acd34442652ea083091c329fa7c5d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f0813bcd2d9d97fdbdf2efb9532ab03ae92e99e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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