{"id":"CVE-2026-23206","state":"PUBLISHED","title":"dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero\n\nThe driver allocates arrays for ports, FDBs, and filter blocks using\nkcalloc() with ethsw->sw_attr.num_ifs as the element count. When the\ndevice reports zero interfaces (either due to hardware configuration\nor firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10)\ninstead of NULL.\n\nLater in dpaa2_switch_probe(), the NAPI initialization unconditionally\naccesses ethsw->ports[0]->netdev, which attempts to dereference\nZERO_SIZE_PTR (address 0x10), resulting in a kernel panic.\n\nAdd a check to ensure num_ifs is greater than zero after retrieving\ndevice attributes. This prevents the zero-sized allocations and\nsubsequent invalid pointer dereference.","publishedAt":"2026-02-14T16:27:29.095Z","updatedAt":"2026-05-11T22:02:22.500Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"2fcccca88456b592bd668db13aa1d29ed257ca2b","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"80165ff16051448d6f840585ebe13f2400415df3","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"b97415c4362f739e25ec6f71012277086fabdf6f","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"4acc40db06ffd0fd92683505342b00c8a7394c60","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"155eb99aff2920153bf21217ae29565fff81e6af","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"ed48a84a72fefb20a82dd90a7caa7807e90c6f66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"5.15.200","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.163","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.124","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.70","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"]}],"references":["https://git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2b","https://git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3","https://git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6f","https://git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60","https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6af","https://git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23206.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23206","state":"PUBLISHED","datePublished":"2026-02-14T16:27:29.095Z","dateUpdated":"2026-05-11T22:02:22.500Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.986Z"},"containers":{"cna":{"title":"dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero\n\nThe driver allocates arrays for ports, FDBs, and filter blocks using\nkcalloc() with ethsw->sw_attr.num_ifs as the element count. When the\ndevice reports zero interfaces (either due to hardware configuration\nor firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10)\ninstead of NULL.\n\nLater in dpaa2_switch_probe(), the NAPI initialization unconditionally\naccesses ethsw->ports[0]->netdev, which attempts to dereference\nZERO_SIZE_PTR (address 0x10), resulting in a kernel panic.\n\nAdd a check to ensure num_ifs is greater than zero after retrieving\ndevice attributes. This prevents the zero-sized allocations and\nsubsequent invalid pointer dereference."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"2fcccca88456b592bd668db13aa1d29ed257ca2b","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"80165ff16051448d6f840585ebe13f2400415df3","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"b97415c4362f739e25ec6f71012277086fabdf6f","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"4acc40db06ffd0fd92683505342b00c8a7394c60","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"155eb99aff2920153bf21217ae29565fff81e6af","versionType":"git"},{"version":"0b1b71370458860579831e77485883fcf2e8fbbe","status":"affected","lessThan":"ed48a84a72fefb20a82dd90a7caa7807e90c6f66","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.13","versionType":"semver"},{"version":"5.15.200","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.163","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.124","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.70","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2b"},{"url":"https://git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3"},{"url":"https://git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6f"},{"url":"https://git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60"},{"url":"https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6af"},{"url":"https://git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:02:22.500Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"5.15.200"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.163"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.124"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.12.70"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}