{"id":"CVE-2026-90307","summary":"RDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ\n\nsrp_recv_done() passes wc-\u003ebyte_len to srp_process_rsp(). It passes\nnothing to srp_process_cred_req() and srp_process_aer_req(), which read\nfixed-size fields from the receive buffer without checking that those\nfields were received.\n\nThe buffer size is max_ti_iu_len, which comes from the login response\nand is not validated. A target that advertises 8 and then sends an\n8-byte SRP_CRED_REQ makes the initiator read req-\u003etag from beyond the\nend of the buffer. req-\u003etag is copied into the SRP_CRED_RSP and sent\nback, so those bytes reach the target. SRP_AER_REQ behaves the same way\nand also reads req-\u003elun.\n\nThe leak is 8 bytes per response. max_ti_iu_len also decides which slab\ncache the buffer comes from. With 8 the buffer is a kmalloc-8 object and\nthe read is entirely outside it:\n\n  BUG: KASAN: slab-out-of-bounds in srp_recv_done+0x172b/0x1aa0\n  Read of size 8 at addr ffff888104714da8 by task kworker/u8:3/50\n   which belongs to the cache kmalloc-8 of size 8\n  The buggy address is located 0 bytes to the right of\n   allocated 8-byte region [ffff888104714da0, ffff888104714da8)\n\nWithout KASAN the returned bytes are whatever is next in the slab. One\nrun returned \".strtab\".\n\nrsp-\u003edata[3] in srp_process_rsp() has the same problem: only\nresp_data_len is checked before it is read.\n\nDrop a request that is shorter than the structure being parsed, and\ncheck byte_len before the tsk_mgmt read.","modified":"2026-09-19T03:47:28.880708578Z","published":"2026-09-17T16:08:29.045Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90307.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/001adf2fe87d1ab677c014a97467bbea5153ae5f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0e7ba617514902501514d577647d866e670dad90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/138eb2f0ef02adfe6ad126afad5b54c56b5046ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3787f4c3e0d813d6c56be9f6dfaf66f8551fb0a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f7fdf561f1ec3b523c39708df00bd808671668d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/961ac0f0c5e414abdd6b33fae84b311d9fde0bd0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc2272c00d7c00ee2a69b57f7ca9caaefcbdb8cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa1b33fdab3e79dce83721ead3220200a2dbec22"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90307.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90307"},{"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":"bb12588a38e6db85e01dceadff7bc161fc92e7d2"},{"fixed":"3f7fdf561f1ec3b523c39708df00bd808671668d"},{"fixed":"138eb2f0ef02adfe6ad126afad5b54c56b5046ee"},{"fixed":"3787f4c3e0d813d6c56be9f6dfaf66f8551fb0a7"},{"fixed":"0e7ba617514902501514d577647d866e670dad90"},{"fixed":"001adf2fe87d1ab677c014a97467bbea5153ae5f"},{"fixed":"dc2272c00d7c00ee2a69b57f7ca9caaefcbdb8cd"},{"fixed":"fa1b33fdab3e79dce83721ead3220200a2dbec22"},{"fixed":"961ac0f0c5e414abdd6b33fae84b311d9fde0bd0"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90307.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.37"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90307.json"}}],"schema_version":"1.9.0"}