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CVE-2026-63887: Linux, грешка в паметта

9.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката може да се автоматизира

Описание

Оригинално описание

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: *length += sprintf(output_buf, "%s=%s", er->key, er->value); *length += 1; output_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.)

Засегнати продукти

  • Linux Linux: e48354ce078c079996f89d715dfa44814b4eba01 преди cb84e974fb172bc71386289f37b78ea679410b39; e48354ce078c079996f89d715dfa44814b4eba01 преди b19382dfc6e7dee6d3859ba44b6ca29e97a51627; e48354ce078c079996f89d715dfa44814b4eba01 преди efe633e600a0ac68357206fede21b1ac8178f3b8; e48354ce078c079996f89d715dfa44814b4eba01 преди 4e9f0c4a645c995bc75c06c7b3644254ffb4c76b; e48354ce078c079996f89d715dfa44814b4eba01 преди 30bf335e8fe170322080ee001f05ca29c50680b3; e48354ce078c079996f89d715dfa44814b4eba01 преди 594a40360012ce5f94c715d5e3b20fa3af7d525a; e48354ce078c079996f89d715dfa44814b4eba01 преди 26e4a304b7e6f1338c675d527608d32549c091db; e48354ce078c079996f89d715dfa44814b4eba01 преди bf33e01f88388c43e285492a63e539df6ffed64c
  • Linux Linux: 3.1; преди 3.1; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.143 до 6.6.*; 6.12.93 до 6.12.*; 6.18.35 до 6.18.*; 7.0.12 до 7.0.*; 7.1 до *

Вид слабост

История

  • 19 юли 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-63887: Linux, грешка в паметта | freedomonline.bg