CVE-2026-43098

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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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/nfc/s3fwrn5/uart.c"], "versions": [{"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "20a57de2e79b797ed75382659d52bf4c7d9cb446", "status": "affected", "versionType": "git"}, {"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "e4ab0fd1c91882f2a7846b1817781c8741f7f315", "status": "affected", "versionType": "git"}, {"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156", "status": "affected", "versionType": "git"}, {"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "7c31f7a599cf00fad3c204092a91a924126c67e4", "status": "affected", "versionType": "git"}, {"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "6d931680a9851481c3243689488eafed08eeff71", "status": "affected", "versionType": "git"}, {"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "09822d3d6f68a0cdc4626e0c507324a4927f55a9", "status": "affected", "versionType": "git"}, {"version": "3f52c2cb7e3ada37513dabb69a22cf917dba754f", "lessThan": "5c14a19d5b1645cce1cb1252833d70b23635b632", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/nfc/s3fwrn5/uart.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}], "title": "nfc: s3fwrn5: allocate rx skb before consuming bytes", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfc: s3fwrn5: asignar rx skb antes de consumir bytes\n\ns3fwrn82_uart_read() informa el n\u00famero de bytes aceptados al n\u00facleo de serdev. El c\u00f3digo actual consume bytes en recv_skb y puede ya entregar una trama completa antes de asignar un nuevo b\u00fafer de recepci\u00f3n.\n\nSi ese alloc_skb() falla, la devoluci\u00f3n de llamada devuelve 0 aunque ya haya consumido bytes, y deja recv_skb como NULL para la siguiente devoluci\u00f3n de llamada de recepci\u00f3n. Eso rompe el contrato de contabilidad de receive_buf() y tambi\u00e9n puede llevar a una desreferencia de NULL en el siguiente skb_put_u8().\n\nAsignar el skb de recepci\u00f3n de forma perezosa en su lugar, antes de consumir el siguiente byte. Si la asignaci\u00f3n falla, devolver el n\u00famero de bytes ya aceptados."}], "id": "CVE-2026-43098", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-06T10:16:23.250", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/20a57de2e79b797ed75382659d52bf4c7d9cb446"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e4ab0fd1c91882f2a7846b1817781c8741f7f315"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nfc: s3fwrn5: allocate rx skb before consuming bytes", "id": "2467025", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467025"}, "csaw": false, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's Near Field Communication (NFC) subsystem, specifically within the s3fwrn5 driver. This vulnerability occurs when the driver attempts to consume bytes into a receive buffer (recv_skb) without ensuring a new buffer is allocated if the previous one was delivered. If the allocation of a new buffer fails, the `recv_skb` pointer can become NULL, leading to a NULL dereference during subsequent operations. A local attacker could exploit this memory corruption vulnerability to cause a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-43098", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43098\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43098\nhttps://lore.kernel.org/linux-cve-announce/2026050620-CVE-2026-43098-960f@gregkh/T"]}

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