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vuln-cve/data/2022/48xxx/CVE-2022-48795.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2022-48795",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-07-16T11:38:08.895Z",
"datePublished": "2024-07-16T11:43:50.129Z",
"dateUpdated": "2026-05-11T18:47:14.594Z"
},
"containers": {
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"shortName": "Linux",
"dateUpdated": "2026-05-11T18:47:14.594Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Fix data TLB miss in sba_unmap_sg\n\nRolf Eike Beer reported the following bug:\n\n[1274934.746891] Bad Address (null pointer deref?): Code=15 (Data TLB miss fault) at addr 0000004140000018\n[1274934.746891] CPU: 3 PID: 5549 Comm: cmake Not tainted 5.15.4-gentoo-parisc64 #4\n[1274934.746891] Hardware name: 9000/785/C8000\n[1274934.746891]\n[1274934.746891] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI\n[1274934.746891] PSW: 00001000000001001111111000001110 Not tainted\n[1274934.746891] r00-03 000000ff0804fe0e 0000000040bc9bc0 00000000406760e4 0000004140000000\n[1274934.746891] r04-07 0000000040b693c0 0000004140000000 000000004a2b08b0 0000000000000001\n[1274934.746891] r08-11 0000000041f98810 0000000000000000 000000004a0a7000 0000000000000001\n[1274934.746891] r12-15 0000000040bddbc0 0000000040c0cbc0 0000000040bddbc0 0000000040bddbc0\n[1274934.746891] r16-19 0000000040bde3c0 0000000040bddbc0 0000000040bde3c0 0000000000000007\n[1274934.746891] r20-23 0000000000000006 000000004a368950 0000000000000000 0000000000000001\n[1274934.746891] r24-27 0000000000001fff 000000000800000e 000000004a1710f0 0000000040b693c0\n[1274934.746891] r28-31 0000000000000001 0000000041f988b0 0000000041f98840 000000004a171118\n[1274934.746891] sr00-03 00000000066e5800 0000000000000000 0000000000000000 00000000066e5800\n[1274934.746891] sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000\n[1274934.746891]\n[1274934.746891] IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000406760e8 00000000406760ec\n[1274934.746891] IIR: 48780030 ISR: 0000000000000000 IOR: 0000004140000018\n[1274934.746891] CPU: 3 CR30: 00000040e3a9c000 CR31: ffffffffffffffff\n[1274934.746891] ORIG_R28: 0000000040acdd58\n[1274934.746891] IAOQ[0]: sba_unmap_sg+0xb0/0x118\n[1274934.746891] IAOQ[1]: sba_unmap_sg+0xb4/0x118\n[1274934.746891] RP(r2): sba_unmap_sg+0xac/0x118\n[1274934.746891] Backtrace:\n[1274934.746891] [<00000000402740cc>] dma_unmap_sg_attrs+0x6c/0x70\n[1274934.746891] [<000000004074d6bc>] scsi_dma_unmap+0x54/0x60\n[1274934.746891] [<00000000407a3488>] mptscsih_io_done+0x150/0xd70\n[1274934.746891] [<0000000040798600>] mpt_interrupt+0x168/0xa68\n[1274934.746891] [<0000000040255a48>] __handle_irq_event_percpu+0xc8/0x278\n[1274934.746891] [<0000000040255c34>] handle_irq_event_percpu+0x3c/0xd8\n[1274934.746891] [<000000004025ecb4>] handle_percpu_irq+0xb4/0xf0\n[1274934.746891] [<00000000402548e0>] generic_handle_irq+0x50/0x70\n[1274934.746891] [<000000004019a254>] call_on_stack+0x18/0x24\n[1274934.746891]\n[1274934.746891] Kernel panic - not syncing: Bad Address (null pointer deref?)\n\nThe bug is caused by overrunning the sglist and incorrectly testing\nsg_dma_len(sglist) before nents. Normally this doesn't cause a crash,\nbut in this case sglist crossed a page boundary. This occurs in the\nfollowing code:\n\n\twhile (sg_dma_len(sglist) && nents--) {\n\nThe fix is simply to test nents first and move the decrement of nents\ninto the loop."
}
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