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CVE-2026-89533: Linux

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.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Fix offset arithmetic in read_chunk_range svc_rdma_read_chunk_range() walks a Read chunk's segment list to build a sub-range starting at byte offset and spanning length bytes for a Position-Zero or Call chunk. Two arithmetic defects in the per-segment loop produce wrong DMA lengths and a u32 underflow: pcl_for_each_segment(segment, chunk) { if (offset > segment->rs_length) { offset -= segment->rs_length; continue; } dummy.rs_handle = segment->rs_handle; dummy.rs_length = min_t(u32, length, segment->rs_length) - offset; dummy.rs_offset = segment->rs_offset + offset; First, the skip predicate uses '>' instead of '>='. When offset equals the segment's full rs_length, the segment is fully consumed and should be skipped, but the loop falls through into the body. The resulting dummy.rs_length is min_t(u32, length, rs_length) - rs_length, which underflows to a near-UINT_MAX u32 when length is smaller than rs_length, or is zero otherwise. Second, the length formula subtracts offset from the min_t() result rather than from segment->rs_length before the cap. For offset > 0 the segment's residual is rs_length - offset, not rs_length, so the cap must be applied to the residual. With the current bracketing, whenever length is smaller than rs_length - offset the per-segment length becomes length - offset instead of length, silently dropping offset bytes from the rebuilt chunk. Combined with the boundary case above it also enables the u32 underflow path, which propagates a huge nr_bvec into svc_rdma_build_read_segment() and a multi-MiB kmalloc_array_node() in svc_rdma_get_rw_ctxt(). Additionally, svc_rdma_read_call_chunk() can invoke this function with length == 0 when the last Read chunk ends exactly at the end of the Call chunk. With the corrected >= predicat

Засегнати продукти

  • Linux Linux: d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди 10873311f91db9454e2fadbf9866bc819e0646d9; d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7; d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди cba8543c18cf42fd80fd63effb6df6ff4f7e73ce; d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди 6ee4dc7476b3abc92ec1d444533a559f33f59561; d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди a46b35f213c2426f5d6a0458a8f7e873fc59cdfd; d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди 4493c96bbd0068fadf69cbae8d13426202e34cdc; d7cc73972661be4a02a1b09f1d9b3283c6c05154 преди 4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e
  • Linux Linux: 5.11; преди 5.11; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

  • 11 септември 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-89533: Linux | freedomonline.bg