{"id":"CVE-2025-40129","title":"sunrpc: fix null pointer dereference on zero-length checksum","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix null pointer dereference on zero-length checksum\n\nIn xdr_stream_decode_opaque_auth(), zero-length checksum.len causes\nchecksum.data to be set to NULL. This …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6","Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < affc03d44921f493deaae1d33151e3067a6f9f8f","Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < ab9a70cd2386a0d70c164b0905dd66bc9af52e77","Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < 6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42","Linux 6.3"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T21:57:08.846724Z"},"published":"2025-11-12","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:38.502Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40129","references":[{"url":"https://git.kernel.org/stable/c/81cec07d303186d0d8c623ef8b5ecd3b81e94cf6"},{"url":"https://git.kernel.org/stable/c/affc03d44921f493deaae1d33151e3067a6f9f8f"},{"url":"https://git.kernel.org/stable/c/ab9a70cd2386a0d70c164b0905dd66bc9af52e77"},{"url":"https://git.kernel.org/stable/c/6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42"}],"tags":["cve.org"],"epss":0.00566,"epssPercentile":0.45642,"ingestedAt":"2026-10-15T22:48:25.547Z","slug":"CVE-2025-40129","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix null pointer dereference on zero-length checksum\n\nIn xdr_stream_decode_opaque_auth(), zero-length checksum.len causes\nchecksum.data to be set to NULL. This triggers a NPD when accessing\nchecksum.data in gss_krb5_verify_mic_v2(). This patch ensures that\nthe value of checksum.len is not less than XDR_UNIT.\n\n## Affected\n\n- `Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6`\n- `Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < affc03d44921f493deaae1d33151e3067a6f9f8f`\n- `Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < ab9a70cd2386a0d70c164b0905dd66bc9af52e77`\n- `Linux >= 0653028e8f1c97fec30710813a001ad8a2ec34f4 < 6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42`\n- `Linux 6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}