# CVE-2021-47015: linux: In the Linux kernel, the following vulnerability has been resolved:  bnxt_en: Fix RX consumer index logic in the erro...

CVE-2021-47015 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47015, released February 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47015
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 28, 2024

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47015](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47015.md) | Feb 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47015](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47015.md) | Feb 28, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47015](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47015.md) | Feb 28, 2024 |

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