{"id":"CVE-2026-43098","state":"PUBLISHED","title":"nfc: s3fwrn5: allocate rx skb before consuming bytes","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: s3fwrn5: allocate rx skb before consuming bytes\n\ns3fwrn82_uart_read() reports the number of accepted bytes to the serdev\ncore. The current code consumes bytes into recv_skb and may already\ndeliver a complete frame before allocating a fresh receive buffer.\n\nIf that alloc_skb() fails, the callback returns 0 even though it has\nalready consumed bytes, and it leaves recv_skb as NULL for the next\nreceive callback. That breaks the receive_buf() accounting contract and\ncan also lead to a NULL dereference on the next skb_put_u8().\n\nAllocate the receive skb lazily before consuming the next byte instead.\nIf allocation fails, return the number of bytes already accepted.","publishedAt":"2026-05-06T07:40:28.845Z","updatedAt":"2026-06-01T16:14:42.508Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"20a57de2e79b797ed75382659d52bf4c7d9cb446","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"e4ab0fd1c91882f2a7846b1817781c8741f7f315","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"7c31f7a599cf00fad3c204092a91a924126c67e4","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"6d931680a9851481c3243689488eafed08eeff71","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"09822d3d6f68a0cdc4626e0c507324a4927f55a9","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"5c14a19d5b1645cce1cb1252833d70b23635b632","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/nfc/s3fwrn5/uart.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/nfc/s3fwrn5/uart.c"]}],"references":["https://git.kernel.org/stable/c/20a57de2e79b797ed75382659d52bf4c7d9cb446","https://git.kernel.org/stable/c/e4ab0fd1c91882f2a7846b1817781c8741f7f315","https://git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156","https://git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4","https://git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71","https://git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9","https://git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43098.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43098","state":"PUBLISHED","datePublished":"2026-05-06T07:40:28.845Z","dateUpdated":"2026-06-01T16:14:42.508Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.984Z"},"containers":{"cna":{"title":"nfc: s3fwrn5: allocate rx skb before consuming bytes","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: s3fwrn5: allocate rx skb before consuming bytes\n\ns3fwrn82_uart_read() reports the number of accepted bytes to the serdev\ncore. The current code consumes bytes into recv_skb and may already\ndeliver a complete frame before allocating a fresh receive buffer.\n\nIf that alloc_skb() fails, the callback returns 0 even though it has\nalready consumed bytes, and it leaves recv_skb as NULL for the next\nreceive callback. That breaks the receive_buf() accounting contract and\ncan also lead to a NULL dereference on the next skb_put_u8().\n\nAllocate the receive skb lazily before consuming the next byte instead.\nIf allocation fails, return the number of bytes already accepted."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"20a57de2e79b797ed75382659d52bf4c7d9cb446","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"e4ab0fd1c91882f2a7846b1817781c8741f7f315","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"7c31f7a599cf00fad3c204092a91a924126c67e4","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"6d931680a9851481c3243689488eafed08eeff71","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"09822d3d6f68a0cdc4626e0c507324a4927f55a9","versionType":"git"},{"version":"3f52c2cb7e3ada37513dabb69a22cf917dba754f","status":"affected","lessThan":"5c14a19d5b1645cce1cb1252833d70b23635b632","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/nfc/s3fwrn5/uart.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/nfc/s3fwrn5/uart.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/20a57de2e79b797ed75382659d52bf4c7d9cb446"},{"url":"https://git.kernel.org/stable/c/e4ab0fd1c91882f2a7846b1817781c8741f7f315"},{"url":"https://git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156"},{"url":"https://git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4"},{"url":"https://git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71"},{"url":"https://git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9"},{"url":"https://git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-01T16:14:42.508Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}