CVE-2021-47015 (GCVE-0-2021-47015)
Vulnerability from cvelistv5
Published
2024-02-28 08:13
Modified
2026-05-23 15:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Fix RX consumer index logic in the error path. In bnxt_rx_pkt(), the RX buffers are expected to complete in order. If the RX consumer index indicates an out of order buffer completion, it means we are hitting a hardware bug and the driver will abort all remaining RX packets and reset the RX ring. The RX consumer index that we pass to bnxt_discard_rx() is not correct. We should be passing the current index (tmp_raw_cons) instead of the old index (raw_cons). This bug can cause us to be at the wrong index when trying to abort the next RX packet. It can crash like this: #0 [ffff9bbcdf5c39a8] machine_kexec at ffffffff9b05e007 #1 [ffff9bbcdf5c3a00] __crash_kexec at ffffffff9b111232 #2 [ffff9bbcdf5c3ad0] panic at ffffffff9b07d61e #3 [ffff9bbcdf5c3b50] oops_end at ffffffff9b030978 #4 [ffff9bbcdf5c3b78] no_context at ffffffff9b06aaf0 #5 [ffff9bbcdf5c3bd8] __bad_area_nosemaphore at ffffffff9b06ae2e #6 [ffff9bbcdf5c3c28] bad_area_nosemaphore at ffffffff9b06af24 #7 [ffff9bbcdf5c3c38] __do_page_fault at ffffffff9b06b67e #8 [ffff9bbcdf5c3cb0] do_page_fault at ffffffff9b06bb12 #9 [ffff9bbcdf5c3ce0] page_fault at ffffffff9bc015c5 [exception RIP: bnxt_rx_pkt+237] RIP: ffffffffc0259cdd RSP: ffff9bbcdf5c3d98 RFLAGS: 00010213 RAX: 000000005dd8097f RBX: ffff9ba4cb11b7e0 RCX: ffffa923cf6e9000 RDX: 0000000000000fff RSI: 0000000000000627 RDI: 0000000000001000 RBP: ffff9bbcdf5c3e60 R8: 0000000000420003 R9: 000000000000020d R10: ffffa923cf6ec138 R11: ffff9bbcdf5c3e83 R12: ffff9ba4d6f928c0 R13: ffff9ba4cac28080 R14: ffff9ba4cb11b7f0 R15: ffff9ba4d5a30000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
References
Impacted products
Vendor Product Version
Linux Linux Version: a1b0e4e684e9c300b9e759b46cb7a0147e61ddff
Version: a1b0e4e684e9c300b9e759b46cb7a0147e61ddff
Version: a1b0e4e684e9c300b9e759b46cb7a0147e61ddff
Version: a1b0e4e684e9c300b9e759b46cb7a0147e61ddff
Version: a1b0e4e684e9c300b9e759b46cb7a0147e61ddff
Version: 8e302e8e10b05165ed21273539a1e6a83ab93e9e
Version: 46281ee85b651b0df686001651b965d17b8e2c67
Version: d2d055a554036b0240f296743942b8111fd4ce97
Version: aecbbae850ede49183fa0b73c7445531a47669cf
Version: 4.9.169   ≤
Version: 4.14.112   ≤
Version: 4.19.35   ≤
Version: 5.0.8   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: Fix RX consumer index logic in the error path.\n\nIn bnxt_rx_pkt(), the RX buffers are expected to complete in order.\nIf the RX consumer index indicates an out of order buffer completion,\nit means we are hitting a hardware bug and the driver will abort all\nremaining RX packets and reset the RX ring.  The RX consumer index\nthat we pass to bnxt_discard_rx() is not correct.  We should be\npassing the current index (tmp_raw_cons) instead of the old index\n(raw_cons).  This bug can cause us to be at the wrong index when\ntrying to abort the next RX packet.  It can crash like this:\n\n #0 [ffff9bbcdf5c39a8] machine_kexec at ffffffff9b05e007\n #1 [ffff9bbcdf5c3a00] __crash_kexec at ffffffff9b111232\n #2 [ffff9bbcdf5c3ad0] panic at ffffffff9b07d61e\n #3 [ffff9bbcdf5c3b50] oops_end at ffffffff9b030978\n #4 [ffff9bbcdf5c3b78] no_context at ffffffff9b06aaf0\n #5 [ffff9bbcdf5c3bd8] __bad_area_nosemaphore at ffffffff9b06ae2e\n #6 [ffff9bbcdf5c3c28] bad_area_nosemaphore at ffffffff9b06af24\n #7 [ffff9bbcdf5c3c38] __do_page_fault at ffffffff9b06b67e\n #8 [ffff9bbcdf5c3cb0] do_page_fault at ffffffff9b06bb12\n #9 [ffff9bbcdf5c3ce0] page_fault at ffffffff9bc015c5\n    [exception RIP: bnxt_rx_pkt+237]\n    RIP: ffffffffc0259cdd  RSP: ffff9bbcdf5c3d98  RFLAGS: 00010213\n    RAX: 000000005dd8097f  RBX: ffff9ba4cb11b7e0  RCX: ffffa923cf6e9000\n    RDX: 0000000000000fff  RSI: 0000000000000627  RDI: 0000000000001000\n    RBP: ffff9bbcdf5c3e60   R8: 0000000000420003   R9: 000000000000020d\n    R10: ffffa923cf6ec138  R11: ffff9bbcdf5c3e83  R12: ffff9ba4d6f928c0\n    R13: ffff9ba4cac28080  R14: ffff9ba4cb11b7f0  R15: ffff9ba4d5a30000\n    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018"
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        "shortName": "Linux"
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    "cveId": "CVE-2021-47015",
    "datePublished": "2024-02-28T08:13:32.135Z",
    "dateReserved": "2024-02-27T18:42:55.953Z",
    "dateUpdated": "2026-05-23T15:19:05.239Z",
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