{"id":"CVE-2026-72098","title":"dm-verity: fix buffer overflow in FEC calculation","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: fix buffer overflow in FEC calculation\n\nThere's a buffer overflow in dm-verity-fec:\n\nif (neras && *neras <= v->fec->roots)\n\tfio->erasures[(*neras)++] = i;\n\nT…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 5488d3a69d205e28f74f18857b853aa12e778e66","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < f7990c2b0f08b8841fcd2652d1d7002f5994a7a7","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 31d6e6c0ba8d5a7bd59660035a089307100c5e8e","Linux 4.5"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:51:49.534768Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:20.681Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72098","references":[{"url":"https://git.kernel.org/stable/c/5488d3a69d205e28f74f18857b853aa12e778e66"},{"url":"https://git.kernel.org/stable/c/f7990c2b0f08b8841fcd2652d1d7002f5994a7a7"},{"url":"https://git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e"}],"tags":["cve.org"],"epss":0.00664,"epssPercentile":0.50725,"ingestedAt":"2026-10-16T17:24:46.876Z","slug":"CVE-2026-72098","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: fix buffer overflow in FEC calculation\n\nThere's a buffer overflow in dm-verity-fec:\n\nif (neras && *neras <= v->fec->roots)\n\tfio->erasures[(*neras)++] = i;\n\nThis allows *neras to reach roots + 1 (the post-increment pushes it past\nroots). This value is then passed as no_eras to decode_rs8(). Inside the\nRS decoder (lib/reed_solomon/decode_rs.c:113-121), the erasure locator\npolynomial loop writes lambda[j] where j can reach nroots + 1 — one\nelement past the end of lambda[] (which is sized nroots + 1, valid\nindices 0..nroots). The out-of-bounds write lands on syn[0], corrupting\nthe syndrome buffer.\n\n## Affected\n\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 5488d3a69d205e28f74f18857b853aa12e778e66`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < f7990c2b0f08b8841fcd2652d1d7002f5994a7a7`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 31d6e6c0ba8d5a7bd59660035a089307100c5e8e`\n- `Linux 4.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}