fkie_cve-2024-49978
Vulnerability from fkie_nvd
Published
2024-10-21 18:15
Modified
2024-10-29 18:01
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: gso: fix udp gso fraglist segmentation after pull from frag_list Detect gso fraglist skbs with corrupted geometry (see below) and pass these to skb_segment instead of skb_segment_list, as the first can segment them correctly. Valid SKB_GSO_FRAGLIST skbs - consist of two or more segments - the head_skb holds the protocol headers plus first gso_size - one or more frag_list skbs hold exactly one segment - all but the last must be gso_size Optional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can modify these skbs, breaking these invariants. In extreme cases they pull all data into skb linear. For UDP, this causes a NULL ptr deref in __udpv4_gso_segment_list_csum at udp_hdr(seg->next)->dest. Detect invalid geometry due to pull, by checking head_skb size. Don't just drop, as this may blackhole a destination. Convert to be able to pass to regular skb_segment.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659dfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86feaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1abPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daaPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.12


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "D22D5882-BF74-46ED-9D50-1924ECF3C786",
                     versionEndExcluding: "6.1.113",
                     versionStartIncluding: "5.6",
                     vulnerable: true,
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                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\ngso: fix udp gso fraglist segmentation after pull from frag_list\n\nDetect gso fraglist skbs with corrupted geometry (see below) and\npass these to skb_segment instead of skb_segment_list, as the first\ncan segment them correctly.\n\nValid SKB_GSO_FRAGLIST skbs\n- consist of two or more segments\n- the head_skb holds the protocol headers plus first gso_size\n- one or more frag_list skbs hold exactly one segment\n- all but the last must be gso_size\n\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\n\nIn extreme cases they pull all data into skb linear. For UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon't just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gso: arregla la segmentación de fraglist gso udp después de extraer de frag_list Detecta skbs de fraglist gso con geometría corrupta (ver abajo) y pásalos a skb_segment en lugar de a skb_segment_list, ya que el primero puede segmentarlos correctamente. Skbs SKB_GSO_FRAGLIST válidos: consisten en dos o más segmentos: el head_skb contiene los encabezados de protocolo más el primero gso_size: uno o más skbs de frag_list contienen exactamente un segmento: todos menos el último deben ser gso_size Los ganchos de ruta de datos opcionales como NAT y BPF (bpf_skb_pull_data) pueden modificar estos skbs, rompiendo estos invariantes. En casos extremos, extraen todos los datos en skb lineal. Para UDP, esto provoca un desreferenciado de ptr NULL en __udpv4_gso_segment_list_csum en udp_hdr(seg->next)->dest. Detecta geometría no válida debido a la extracción, verificando el tamaño de head_skb. No la elimines, ya que esto puede convertir un destino en un agujero negro. Convierte para poder pasar a skb_segment normal.",
      },
   ],
   id: "CVE-2024-49978",
   lastModified: "2024-10-29T18:01:43.080",
   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: "2024-10-21T18:15:18.483",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc",
      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-476",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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