{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-06-02T10:15:49.876","vulnerabilities":[{"cve":{"id":"CVE-2026-23057","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2026-02-04T17:16:16.380","lastModified":"2026-04-15T00:35:42.020","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: Coalesce only linear skb\n\nvsock/virtio common tries to coalesce buffers in rx queue: if a linear skb\n(with a spare tail room) is followed by a small skb (length limited by\nGOOD_COPY_LEN = 128), an attempt is made to join them.\n\nSince the introduction of MSG_ZEROCOPY support, assumption that a small skb\nwill always be linear is incorrect. In the zerocopy case, data is lost and\nthe linear skb is appended with uninitialized kernel memory.\n\nOf all 3 supported virtio-based transports, only loopback-transport is\naffected. G2H virtio-transport rx queue operates on explicitly linear skbs;\nsee virtio_vsock_alloc_linear_skb() in virtio_vsock_rx_fill(). H2G\nvhost-transport may allocate non-linear skbs, but only for sizes that are\nnot considered for coalescence; see PAGE_ALLOC_COSTLY_ORDER in\nvirtio_vsock_alloc_skb().\n\nEnsure only linear skbs are coalesced. Note that skb_tailroom(last_skb) > 0\nguarantees last_skb is linear."},{"lang":"es","value":"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvsock/virtio: Coalescer solo skb lineal\n\nEl común de vsock/virtio intenta coalescer búferes en la cola rx: si un skb lineal (con espacio de cola libre) es seguido por un skb pequeño (longitud limitada por GOOD_COPY_LEN = 128), se intenta unirlos.\n\nDesde la introducción del soporte MSG_ZEROCOPY, la suposición de que un skb pequeño siempre será lineal es incorrecta. En el caso de zerocopy, se pierden datos y el skb lineal es anexado con memoria del kernel no inicializada.\n\nDe todos los 3 transportes basados en virtio soportados, solo el transporte loopback se ve afectado. La cola rx del transporte virtio G2H opera con skbs explícitamente lineales; ver virtio_vsock_alloc_linear_skb() en virtio_vsock_rx_fill(). El transporte vhost H2G puede asignar skbs no lineales, pero solo para tamaños que no se consideran para la coalescencia; ver PAGE_ALLOC_COSTLY_ORDER en virtio_vsock_alloc_skb().\n\nAsegurar que solo los skbs lineales sean coalescidos. Tenga en cuenta que skb_tailroom(last_skb) > 0 garantiza que last_skb es lineal."}],"metrics":{},"references":[{"url":"https://git.kernel.org/stable/c/0386bd321d0f95d041a7b3d7b07643411b044a96","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/568e9cd8ed7ca9bf748c7687ba6501f29d30e59f","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/63ef9b300bd09e24c57050c5dbe68feedce42e72","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}]}}]}