{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98884",
  "modified": "2026-10-24T04:30:01Z",
  "upstream": [
    "CVE-2026-98884"
  ],
  "published": "2026-10-23T11:38:26Z",
  "summary": "mmc: core: Add validation for host-provided max_segs",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: core: Add validation for host-provided max_segs\n\nThe max_segs field is of type unsigned short, and if a host driver\nsets an excessively large value, it may be truncated to zero. This\ncan cause mmc_alloc_sg() to call kmalloc_objs() with a zero size\nallocation request, which leads to undefined behavior.\n\nUnder the SLUB allocator, kmalloc(0) returns a special pointer\n(ZERO_SIZE_PTR). The subsequent 'if (sg)' check will evaluate to\ntrue, and sg_init_table() will then attempt to access invalid memory,\nresulting in a crash:\n\ndwmmc_rockchip 2a310000.mmc: Successfully tuned phase to 133\nmmc1: new UHS-I speed SDR104 SDHC card at address aaaa\nUnable to handle kernel paging request at virtual address 0000001ffffffff0\nMem abort info:\nESR = 0x0000000096000004\nEC = 0x25: DABT (current EL), IL = 32 bits\nSET = 0, FnV = 0\nEA = 0, S1PTW = 0\nFSC = 0x04: level 0 translation fault\nData abort info:\nISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\nCM = 0, WnR = 0, TnD = 0, TagAccess = 0\nGCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\nuser pgtable: 4k pages, 48-bit VAs, pgdp=0000000102c88000\n[0000001ffffffff0] pgd=0000000000000000, p4d=0000000000000000\nInternal error: Oops: 0000000096000004 [#1] SMP\nModules linked in:\nCPU: 2 UID: 0 PID: 102 Comm: kworker/2:1 Not tainted 7.0.0-rc6-next-20260331-00013-g4d93c25963c5-dirty #80 PREEMPT\nHardware name: Rockchip RK3576 EVB V10 Board (DT)\nWorkqueue: events_freezable mmc_rescan\npstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : sg_init_table+0x2c/0x50\nlr : sg_init_table+0x24/0x50\nsp : ffff8000837db710\nx29: ffff8000837db710 x28: 000000000000c000 x27: 0000000000000300\nx26: 0000000000000000 x25: 0000000000000040 x24: ffff0000c46a0000\nx23: 0000000000000000 x22: ffff0000c0c73c00 x21: 0000000000000010\nx20: 0000000000000010 x19: 0000000000000000 x18: 000000000000002c\nx17: 0000000000000000 x16: 0000000000000001 x15: 0000000000000000\nx14: 0000000000000400 x13: ffff8000837dc000 x12: 0000000000000000\nx11: ffff0000c0c73ca0 x10: 0000000000000040 x9 : 459ec1f0abbdbb00\nx8 : 0000001fffffffe0 x7 : 0000000000000000 x6 : 000000000000003f\nx5 : 0000000000035579 x4 : 0000000000000901 x3 : 0000000000000000\nx2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000010\nCall trace:\nsg_init_table+0x2c/0x50 (P)\nmmc_mq_init_request+0x64/0x90\nblk_mq_alloc_map_and_rqs+0x3ac/0x480\nblk_mq_alloc_set_map_and_rqs+0x98/0x1e0\nblk_mq_alloc_tag_set+0x1c0/0x290\nmmc_init_queue+0x120/0x370\nmmc_blk_alloc_req+0x150/0x420\n\nTo prevent this, add a validation check in mmc_mq_init_request() to\ndetect when sg_len (derived from max_segs) is zero. If sg_len is zero,\nwe return an error and print an error message, allowing host driver\ndevelopers to identify and fix incorrect max_segs configuration.\n\nThis is a defensive measure that ensures the MMC core fails gracefully\nwhen host drivers provide invalid max_segs values, rather than crashing\nwith a page fault.",
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