Homepage

NULL Pointer Dereference Affecting kernel-doc package, versions *

Severity

 Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about NULL Pointer Dereference vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-RHEL6-KERNELDOC-8238020
  • published22 Oct 2024
  • disclosed21 Oct 2024
Report a new vulnerability Found a mistake?

Introduced: 21 Oct 2024

CVE-2024-47688  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:6 kernel-doc.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by RHEL. See How to fix? for RHEL:6 relevant fixed versions and status.

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

driver core: Fix a potential null-ptr-deref in module_add_driver()

Inject fault while probing of-fpga-region, if kasprintf() fails in module_add_driver(), the second sysfs_remove_link() in exit path will cause null-ptr-deref as below because kernfs_name_hash() will call strlen() with NULL driver_name.

Fix it by releasing resources based on the exit path sequence.

 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
 Mem abort info:
   ESR = 0x0000000096000005
   EC = 0x25: DABT (current EL), IL = 32 bits
   SET = 0, FnV = 0
   EA = 0, S1PTW = 0
   FSC = 0x05: level 1 translation fault
 Data abort info:
   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
 [dfffffc000000000] address between user and kernel address ranges
 Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
 Dumping ftrace buffer:
    (ftrace buffer empty)
 Modules linked in: of_fpga_region(+) fpga_region fpga_bridge cfg80211 rfkill 8021q garp mrp stp llc ipv6 [last unloaded: of_fpga_region]
 CPU: 2 UID: 0 PID: 2036 Comm: modprobe Not tainted 6.11.0-rc2-g6a0e38264012 #295
 Hardware name: linux,dummy-virt (DT)
 pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : strlen+0x24/0xb0
 lr : kernfs_name_hash+0x1c/0xc4
 sp : ffffffc081f97380
 x29: ffffffc081f97380 x28: ffffffc081f97b90 x27: ffffff80c821c2a0
 x26: ffffffedac0be418 x25: 0000000000000000 x24: ffffff80c09d2000
 x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000
 x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000001840
 x17: 0000000000000000 x16: 0000000000000000 x15: 1ffffff8103f2e42
 x14: 00000000f1f1f1f1 x13: 0000000000000004 x12: ffffffb01812d61d
 x11: 1ffffff01812d61c x10: ffffffb01812d61c x9 : dfffffc000000000
 x8 : 0000004fe7ed29e4 x7 : ffffff80c096b0e7 x6 : 0000000000000001
 x5 : ffffff80c096b0e0 x4 : 1ffffffdb990efa2 x3 : 0000000000000000
 x2 : 0000000000000000 x1 : dfffffc000000000 x0 : 0000000000000000
 Call trace:
  strlen+0x24/0xb0
  kernfs_name_hash+0x1c/0xc4
  kernfs_find_ns+0x118/0x2e8
  kernfs_remove_by_name_ns+0x80/0x100
  sysfs_remove_link+0x74/0xa8
  module_add_driver+0x278/0x394
  bus_add_driver+0x1f0/0x43c
  driver_register+0xf4/0x3c0
  __platform_driver_register+0x60/0x88
  of_fpga_region_init+0x20/0x1000 [of_fpga_region]
  do_one_initcall+0x110/0x788
  do_init_module+0x1dc/0x5c8
  load_module+0x3c38/0x4cac
  init_module_from_file+0xd4/0x128
  idempotent_init_module+0x2cc/0x528
  __arm64_sys_finit_module+0xac/0x100
  invoke_syscall+0x6c/0x258
  el0_svc_common.constprop.0+0x160/0x22c
  do_el0_svc+0x44/0x5c
  el0_svc+0x48/0xb8
  el0t_64_sync_handler+0x13c/0x158
  el0t_64_sync+0x190/0x194
 Code: f2fbffe1 a90157f4 12000802 aa0003f5 (38e16861)
 ---[ end trace 0000000000000000 ]---
 Kernel panic - not syncing: Oops: Fatal exception

CVSS Scores

version 3.1