CVE-2024-38598

2024-06-1914:15:19

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

web.nvd.nist.gov

linux kernel

softlockup vulnerability

lvextend

lvchange

dm-raid10

resync softlockup

mddev

sync_request

bitmap size

array size

patch

cve-2024-38598

6.4 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%

JSON

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

md: fix resync softlockup when bitmap size is less than array size

Is is reported that for dm-raid10, lvextend + lvchange --syncaction will
trigger following softlockup:

kernel:watchdog: BUG: soft lockup - CPU#3 stuck for 26s! [mdX_resync:6976]
CPU: 7 PID: 3588 Comm: mdX_resync Kdump: loaded Not tainted 6.9.0-rc4-next-20240419 #1
RIP: 0010:_raw_spin_unlock_irq+0x13/0x30
Call Trace:
<TASK>
md_bitmap_start_sync+0x6b/0xf0
raid10_sync_request+0x25c/0x1b40 [raid10]
md_do_sync+0x64b/0x1020
md_thread+0xa7/0x170
kthread+0xcf/0x100
ret_from_fork+0x30/0x50
ret_from_fork_asm+0x1a/0x30

And the detailed process is as follows:

md_do_sync
j = mddev->resync_min
while (j < max_sectors)
sectors = raid10_sync_request(mddev, j, &skipped)
if (!md_bitmap_start_sync(…, &sync_blocks))
// md_bitmap_start_sync set sync_blocks to 0
return sync_blocks + sectors_skippe;
// sectors = 0;
j += sectors;
// j never change

Root cause is that commit 301867b1c168 (“md/raid10: check
slab-out-of-bounds in md_bitmap_get_counter”) return early from
md_bitmap_get_counter(), without setting returned blocks.

Fix this problem by always set returned blocks from
md_bitmap_get_counter"(), as it used to be.

Noted that this patch just fix the softlockup problem in kernel, the
case that bitmap size doesn’t match array size still need to be fixed.

Affected configurations

Vulners

Node

linuxlinux_kernelRange6.5–4.19.316

linuxlinux_kernelRange4.20.0–5.4.278

linuxlinux_kernelRange5.5.0–5.10.219

linuxlinux_kernelRange5.11.0–5.15.161

linuxlinux_kernelRange5.16.0–6.1.93

linuxlinux_kernelRange6.2.0–6.6.33

linuxlinux_kernelRange6.7.0–6.8.12

linuxlinux_kernelRange6.9.0–6.9.3

linuxlinux_kernelRange6.10.0–6.10-rc1

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/md-bitmap.c"
    ],
    "versions": [
      {
        "version": "374fb914304d",
        "lessThan": "d4b9c764d48f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b0b971fe7d61",
        "lessThan": "43771597feba",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "39fa14e824ac",
        "lessThan": "3f5b73ef8fd6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a134dd582c0d",
        "lessThan": "69296914bfd5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "be1a3ec63a84",
        "lessThan": "71e8e4f288e7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "301867b1c168",
        "lessThan": "c9566b812c8f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "301867b1c168",
        "lessThan": "5817f43ae1a1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "301867b1c168",
        "lessThan": "8bbc71315e0a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "301867b1c168",
        "lessThan": "f0e729af2eb6",
        "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/md/md-bitmap.c"
    ],
    "versions": [
      {
        "version": "6.5",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.5",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.316",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.278",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.219",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.161",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.93",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.33",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.12",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.3",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]