CVE-2024-26643 netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout

2024-03-2110:43:44

Linux

github.com

linux kernel

netfilter

nf_tables

race vulnerability

asynchronous gc

dead flag

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.1%

JSON

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

netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout

While the rhashtable set gc runs asynchronously, a race allows it to
collect elements from anonymous sets with timeouts while it is being
released from the commit path.

Mingi Cho originally reported this issue in a different path in 6.1.x
with a pipapo set with low timeouts which is not possible upstream since
7395dfacfff6 (“netfilter: nf_tables: use timestamp to check for set
element timeout”).

Fix this by setting on the dead flag for anonymous sets to skip async gc
in this case.

According to 08e4c8c5919f (“netfilter: nf_tables: mark newset as dead on
transaction abort”), Florian plans to accelerate abort path by releasing
objects via workqueue, therefore, this sets on the dead flag for abort
path too.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "8da1b048f9a5",
        "lessThan": "d75a589bb92a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbdb3b65aa91",
        "lessThan": "edcf1a3f182e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "448be0774882",
        "lessThan": "e2d45f467096",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d19e8bf3ea41",
        "lessThan": "291cca35818b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea3eb9f2192e",
        "lessThan": "406b0241d0eb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f68718b34a5",
        "lessThan": "b2d6f9a5b1cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f68718b34a5",
        "lessThan": "5224afbc30c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f68718b34a5",
        "lessThan": "552705a3650b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_tables_api.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.5",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.4.274",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.215",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.154",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.84",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.24",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.12",
        "versionType": "custom",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_tables_api.c"
    ],
    "defaultStatus": "affected"
  }
]