CVE-2021-47440

2024-05-2207:15:09

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

net

encx24j600

vulnerability

cve-2021-47440

error

devm_regmap_init_encx24j600

null pointer dereference

nvd

6.4 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

JSON

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

net: encx24j600: check error in devm_regmap_init_encx24j600

devm_regmap_init may return error which caused by like out of memory,
this will results in null pointer dereference later when reading
or writing register:

general protection fault in encx24j600_spi_probe
KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]
CPU: 0 PID: 286 Comm: spi-encx24j600- Not tainted 5.15.0-rc2-00142-g9978db750e31-dirty #11 9c53a778c1306b1b02359f3c2bbedc0222cba652
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:regcache_cache_bypass drivers/base/regmap/regcache.c:540
Code: 54 41 89 f4 55 53 48 89 fb 48 83 ec 08 e8 26 94 a8 fe 48 8d bb a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4a 03 00 00 4c 8d ab b0 00 00 00 48 8b ab a0 00
RSP: 0018:ffffc900010476b8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000
RDX: 0000000000000012 RSI: ffff888002de0000 RDI: 0000000000000094
RBP: ffff888013c9a000 R08: 0000000000000000 R09: fffffbfff3f9cc6a
R10: ffffc900010476e8 R11: fffffbfff3f9cc69 R12: 0000000000000001
R13: 000000000000000a R14: ffff888013c9af54 R15: ffff888013c9ad08
FS: 00007ffa984ab580(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a6384136c8 CR3: 000000003bbe6003 CR4: 0000000000770ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
encx24j600_spi_probe drivers/net/ethernet/microchip/encx24j600.c:459
spi_probe drivers/spi/spi.c:397
really_probe drivers/base/dd.c:517
__driver_probe_device drivers/base/dd.c:751
driver_probe_device drivers/base/dd.c:782
__device_attach_driver drivers/base/dd.c:899
bus_for_each_drv drivers/base/bus.c:427
__device_attach drivers/base/dd.c:971
bus_probe_device drivers/base/bus.c:487
device_add drivers/base/core.c:3364
__spi_add_device drivers/spi/spi.c:599
spi_add_device drivers/spi/spi.c:641
spi_new_device drivers/spi/spi.c:717
new_device_store+0x18c/0x1f1 [spi_stub 4e02719357f1ff33f5a43d00630982840568e85e]
dev_attr_store drivers/base/core.c:2074
sysfs_kf_write fs/sysfs/file.c:139
kernfs_fop_write_iter fs/kernfs/file.c:300
new_sync_write fs/read_write.c:508 (discriminator 4)
vfs_write fs/read_write.c:594
ksys_write fs/read_write.c:648
do_syscall_64 arch/x86/entry/common.c:50
entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:113

Add error check in devm_regmap_init_encx24j600 to avoid this situation.

Affected configurations

Vulners

Node

linuxlinux_kernelRange4.4–4.4.290

linuxlinux_kernelRange4.5.0–4.9.288

linuxlinux_kernelRange4.10.0–4.14.252

linuxlinux_kernelRange4.15.0–4.19.213

linuxlinux_kernelRange4.20.0–5.4.155

linuxlinux_kernelRange5.5.0–5.10.75

linuxlinux_kernelRange5.11.0–5.14.14

linuxlinux_kernelRange5.15.0≥

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/microchip/encx24j600-regmap.c",
      "drivers/net/ethernet/microchip/encx24j600.c",
      "drivers/net/ethernet/microchip/encx24j600_hw.h"
    ],
    "versions": [
      {
        "version": "04fbfce7a222",
        "lessThan": "66358471fa75",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "f043fac1133a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "fddc7f678d7f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "5e5494e6fc8a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "4c2eb80fc90b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "e19c10d6e07c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "322c0e534963",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "04fbfce7a222",
        "lessThan": "f03dca0c9e22",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/microchip/encx24j600-regmap.c",
      "drivers/net/ethernet/microchip/encx24j600.c",
      "drivers/net/ethernet/microchip/encx24j600_hw.h"
    ],
    "versions": [
      {
        "version": "4.4",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.4",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.4.290",
        "lessThanOrEqual": "4.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.288",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.252",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.213",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.155",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.75",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.14.14",
        "lessThanOrEqual": "5.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]