5.5

CVE-2022-48647

sfc: fix TX channel offset when using legacy interrupts

In the Linux kernel, the following vulnerability has been resolved:

sfc: fix TX channel offset when using legacy interrupts

In legacy interrupt mode the tx_channel_offset was hardcoded to 1, but
that's not correct if efx_sepparate_tx_channels is false. In that case,
the offset is 0 because the tx queues are in the single existing channel
at index 0, together with the rx queue.

Without this fix, as soon as you try to send any traffic, it tries to
get the tx queues from an uninitialized channel getting these errors:
  WARNING: CPU: 1 PID: 0 at drivers/net/ethernet/sfc/tx.c:540 efx_hard_start_xmit+0x12e/0x170 [sfc]
  [...]
  RIP: 0010:efx_hard_start_xmit+0x12e/0x170 [sfc]
  [...]
  Call Trace:
   <IRQ>
   dev_hard_start_xmit+0xd7/0x230
   sch_direct_xmit+0x9f/0x360
   __dev_queue_xmit+0x890/0xa40
  [...]
  BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
  [...]
  RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]
  [...]
  Call Trace:
   <IRQ>
   dev_hard_start_xmit+0xd7/0x230
   sch_direct_xmit+0x9f/0x360
   __dev_queue_xmit+0x890/0xa40
  [...]
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.10.122 < 5.10.146
Linux ≫ Linux Kernel Version >= 5.15.47 < 5.15.71
Linux ≫ Linux Kernel Version >= 5.17.15 < 5.18
Linux ≫ Linux Kernel Version >= 5.18.4 < 5.19.12
Linux ≫ Linux Kernel Version6.0 Updaterc1
Linux ≫ Linux Kernel Version6.0 Updaterc2
Linux ≫ Linux Kernel Version6.0 Updaterc3
Linux ≫ Linux Kernel Version6.0 Updaterc4
Linux ≫ Linux Kernel Version6.0 Updaterc5
Linux ≫ Linux Kernel Version6.0 Updaterc6
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.23% 0.13
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/360910b88d1466a90644a4e0533803b594344a2b
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https://git.kernel.org/stable/c/5f623a77cfc2d501d72bcb4f9ee71721e6c766ff
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https://git.kernel.org/stable/c/b4afd3878f961d3517f27b3213730fceef77945c
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https://git.kernel.org/stable/c/f232af4295653afa4ade3230462b3be15ad16419
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