[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2026-63887":6},{"stargazers_count":4,"fetched_at":5},8,"2026-09-19T04:32:17.889Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":17,"related":18,"reserved_at":9,"published_at":19,"modified_at":20,"state":9,"summary":21,"references_raw":23,"kevs":30,"epss":9,"epss_history":31,"metrics":32,"affected":38},"DEBIAN-CVE-2026-63887","In the Linux kernel, the following vulnerability has been resolved:  scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf  iscsi_encode_text_output() concatenates \"key=value\\0\" records into login->rsp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer allocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call sites in this function (lines 1398, 1411, 1424 in v7.1-rc2) never check the remaining buffer capacity:  \t*length += sprintf(output_buf, \"%s=%s\", er->key, er->value); \t*length += 1; \toutput_buf = textbuf + *length;  The 8192-byte ceiling at iscsi_target_check_login_request() bounds the *input* Login PDU payload, but a single PDU can carry up to 2048 minimal four-byte \"a=b\\0\" pairs, each unknown key expanding to a 16-byte \"a=NotUnderstood\\0\" output record via iscsi_add_notunderstood_response(). 2048 * 16 = 32 KiB of output into an 8 KiB buffer, producing a ~24 KiB heap overrun in the kmalloc-8k slab.  The fix introduces a static iscsi_encode_text_record() helper that uses snprintf() with a per-call bounds check against the remaining buffer, and threads a u32 textbuf_size parameter through iscsi_encode_text_output(). Both call sites in iscsi_target_handle_csg_zero() (PHASE_SECURITY) and iscsi_target_handle_csg_one() (PHASE_OPERATIONAL) pass MAX_KEY_VALUE_PAIRS. On overflow the encoder logs the condition, calls iscsi_release_extra_responses() to drop queued records, and returns -1; both caller sites now emit ISCSI_STATUS_CLS_INITIATOR_ERR / ISCSI_LOGIN_STATUS_INIT_ERR via iscsit_tx_login_rsp() before returning, so the initiator sees an explicit failed-login response rather than a silent connection drop. (Prior to this patch only the PHASE_OPERATIONAL caller did that; the PHASE_SECURITY caller is converted to the same shape.)",null,[],[],[],[14],{"_key":15},"CVE-2026-63887",[],[],[],"2026-07-19T16:17:05.853Z","2026-07-21T09:00:44.903144469Z",{"cisa_kev":22,"cisa_ransomware":22,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[24],{"url":25,"sources":26,"tags":28},"https://security-tracker.debian.org/tracker/CVE-2026-63887",[27],"osv_debian",[29],"Advisory",[],[],[33],{"source":27,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":34,"cvss_v4_0":9},{"baseScore":35,"baseSeverity":9,"vectorString":36,"impactScore":35,"exploitabilityScore":37},9.8,"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",10,[39],{"ecosystem":40,"name":41,"vendor":42,"product":41,"cpe_part":9,"purl_type":43,"purl_namespace":42,"purl_name":41,"source":9,"versions":44},"Debian","linux","debian","deb",[45,51,54,57],{"version":46,"is_range":47,"range_type":48,"version_start":9,"version_start_type":9,"version_end":49,"version_end_type":50,"fixed_in":9},"lt5_10_259_1",true,"ecosystem","5.10.259-1","excluding",{"version":52,"is_range":47,"range_type":48,"version_start":9,"version_start_type":9,"version_end":53,"version_end_type":50,"fixed_in":9},"lt6_1_176_1","6.1.176-1",{"version":55,"is_range":47,"range_type":48,"version_start":9,"version_start_type":9,"version_end":56,"version_end_type":50,"fixed_in":9},"lt6_12_94_1","6.12.94-1",{"version":58,"is_range":47,"range_type":48,"version_start":9,"version_start_type":9,"version_end":59,"version_end_type":50,"fixed_in":9},"lt7_0_12_1","7.0.12-1"]