{"id":"CVE-2026-43205","summary":"dpaa2-switch: validate num_ifs to prevent out-of-bounds write","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: validate num_ifs to prevent out-of-bounds write\n\nThe driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes()\nbut never validates it against DPSW_MAX_IF (64). This value controls\niteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices\ninto the fixed-size cfg-\u003eif_id[DPSW_MAX_IF] array. When firmware reports\nnum_ifs \u003e= 64, the loop can write past the array bounds.\n\nAdd a bound check for num_ifs in dpaa2_switch_init().\n\ndpaa2_switch_fdb_get_flood_cfg() appends the control interface (port\nnum_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all\nports match the flood filter, the loop fills all 64 slots and the control\ninterface write overflows by one entry.\n\nThe check uses \u003e= because num_ifs == DPSW_MAX_IF is also functionally\nbroken.\n\nbuild_if_id_bitmap() silently drops any ID \u003e= 64:\n      if (id[i] \u003c DPSW_MAX_IF)\n          bmap[id[i] / 64] |= ...","modified":"2026-05-28T03:54:49.263609400Z","published":"2026-05-06T11:28:10.270Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43205.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43205.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43205"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"539dda3c5d190c5088b5e57944b1b482fcb464de"},{"fixed":"a26dda3bae469c8e4e1b1993ad33dafa32d0fc28"},{"fixed":"a3034a8d56174dd6464c46823438f25797910a8d"},{"fixed":"b690635d4719214892855b79ce018d4b1672ac96"},{"fixed":"8b841fd529db9faf8bc678d429d4bf4e98b10900"},{"fixed":"89764cf44544e943230f5e03b8c40a90da26537c"},{"fixed":"c18493f750208eb4ff1198fc5a02786b8b2d70a6"},{"fixed":"8a5752c6dcc085a3bfc78589925182e4e98468c5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43205.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.13.0"},{"fixed":"5.15.202"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.165"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.128"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43205.json"}}],"schema_version":"1.7.5"}