{"id":"CVE-2025-39880","title":"libceph: fix invalid accesses to ceph_connection_v1_info","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix invalid accesses to ceph_connection_v1_info\n\nThere is a place where generic code in messenger.c is reading and\nanother place where it is writing to con->v1…","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 >= cd1a677cad994021b19665ed476aea63f5d54f31 < ea12ab684f8ae8a6da11a22c78d94a79e2163096","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 591ea9c30737663a471b2bb07b27ddde86b020d5","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 6bd8b56899be0b514945f639a89ccafb8f8dfaef","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < cdbc9836c7afadad68f374791738f118263c5371","Linux 5.11"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-15T21:54:32.238506Z"},"published":"2025-09-23","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:32.742Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39880","references":[{"url":"https://git.kernel.org/stable/c/ea12ab684f8ae8a6da11a22c78d94a79e2163096"},{"url":"https://git.kernel.org/stable/c/591ea9c30737663a471b2bb07b27ddde86b020d5"},{"url":"https://git.kernel.org/stable/c/23538cfbeed87159a5ac6c61e7a6de3d8d4486a8"},{"url":"https://git.kernel.org/stable/c/35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983"},{"url":"https://git.kernel.org/stable/c/6bd8b56899be0b514945f639a89ccafb8f8dfaef"},{"url":"https://git.kernel.org/stable/c/cdbc9836c7afadad68f374791738f118263c5371"}],"tags":["cve.org"],"epss":0.00331,"epssPercentile":0.26082,"ingestedAt":"2026-10-15T22:48:25.529Z","slug":"CVE-2025-39880","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix invalid accesses to ceph_connection_v1_info\n\nThere is a place where generic code in messenger.c is reading and\nanother place where it is writing to con->v1 union member without\nchecking that the union member is active (i.e. msgr1 is in use).\n\nOn 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter,\nso such a read is almost guaranteed to return a bogus value instead of\n0 when msgr2 is in use.  This ends up being fairly benign because the\nside effect is just the invalidation of the authorizer and successive\nfetching of new tickets.\n\ncon->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that\nit's being written to can cause more serious consequences, but luckily\nit's not something that happens often.\n\n## Affected\n\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < ea12ab684f8ae8a6da11a22c78d94a79e2163096`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 591ea9c30737663a471b2bb07b27ddde86b020d5`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 23538cfbeed87159a5ac6c61e7a6de3d8d4486a8`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 6bd8b56899be0b514945f639a89ccafb8f8dfaef`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < cdbc9836c7afadad68f374791738f118263c5371`\n- `Linux 5.11`\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":[]}