nfc: s3fwrn5: allocate rx skb before consuming bytes

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Summary

CVECVE-2026-43098
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:23 UTC
Updated2026-05-06 10:16:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfc: s3fwrn5: allocate rx skb before consuming bytes s3fwrn82_uart_read() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already deliver a complete frame before allocating a fresh receive buffer. If that alloc_skb() fails, the callback returns 0 even though it has already consumed bytes, and it leaves recv_skb as NULL for the next receive callback. That breaks the receive_buf() accounting contract and can also lead to a NULL dereference on the next skb_put_u8(). Allocate the receive skb lazily before consuming the next byte instead. If allocation fails, return the number of bytes already accepted.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3f52c2cb7e3ada37513dabb69a22cf917dba754f d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156 git Not specified
CNA Linux Linux affected 3f52c2cb7e3ada37513dabb69a22cf917dba754f 7c31f7a599cf00fad3c204092a91a924126c67e4 git Not specified
CNA Linux Linux affected 3f52c2cb7e3ada37513dabb69a22cf917dba754f 6d931680a9851481c3243689488eafed08eeff71 git Not specified
CNA Linux Linux affected 3f52c2cb7e3ada37513dabb69a22cf917dba754f 09822d3d6f68a0cdc4626e0c507324a4927f55a9 git Not specified
CNA Linux Linux affected 3f52c2cb7e3ada37513dabb69a22cf917dba754f 5c14a19d5b1645cce1cb1252833d70b23635b632 git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 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 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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