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CVE-2024-35846 (GCVE-0-2024-35846)

Vulnerability from cvelistv5 – Published: 2024-05-17 14:47 – Updated: 2026-05-11 20:12
VLAI
Title
mm: zswap: fix shrinker NULL crash with cgroup_disable=memory
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: zswap: fix shrinker NULL crash with cgroup_disable=memory Christian reports a NULL deref in zswap that he bisected down to the zswap shrinker. The issue also cropped up in the bug trackers of libguestfs [1] and the Red Hat bugzilla [2]. The problem is that when memcg is disabled with the boot time flag, the zswap shrinker might get called with sc->memcg == NULL. This is okay in many places, like the lruvec operations. But it crashes in memcg_page_state() - which is only used due to the non-node accounting of cgroup's the zswap memory to begin with. Nhat spotted that the memcg can be NULL in the memcg-disabled case, and I was then able to reproduce the crash locally as well. [1] https://github.com/libguestfs/libguestfs/issues/139 [2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-17 17:15 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b5ba474f3f518701249598b35c581b92a3c95b48 , < b0fdabc908a7f81d12382c87ca9e46a9c2e14042 (git)
Affected: b5ba474f3f518701249598b35c581b92a3c95b48 , < 682886ec69d22363819a83ddddd5d66cb5c791e1 (git)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.8.9 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b0fdabc908a7f81d12382c87ca9e46a9c2e14042\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/682886ec69d22363819a83ddddd5d66cb5c791e1\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T03:21:48.525Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-35846\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-17T17:15:58.051096Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:24.606Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"mm: zswap: fix shrinker NULL crash with cgroup_disable=memory\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b5ba474f3f518701249598b35c581b92a3c95b48\", \"lessThan\": \"b0fdabc908a7f81d12382c87ca9e46a9c2e14042\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b5ba474f3f518701249598b35c581b92a3c95b48\", \"lessThan\": \"682886ec69d22363819a83ddddd5d66cb5c791e1\", \"versionType\": \"git\"}], \"programFiles\": [\"mm/zswap.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.8.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"mm/zswap.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b0fdabc908a7f81d12382c87ca9e46a9c2e14042\"}, {\"url\": \"https://git.kernel.org/stable/c/682886ec69d22363819a83ddddd5d66cb5c791e1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm: zswap: fix shrinker NULL crash with cgroup_disable=memory\\n\\nChristian reports a NULL deref in zswap that he bisected down to the zswap\\nshrinker.  The issue also cropped up in the bug trackers of libguestfs [1]\\nand the Red Hat bugzilla [2].\\n\\nThe problem is that when memcg is disabled with the boot time flag, the\\nzswap shrinker might get called with sc-\u003ememcg == NULL.  This is okay in\\nmany places, like the lruvec operations.  But it crashes in\\nmemcg_page_state() - which is only used due to the non-node accounting of\\ncgroup\u0027s the zswap memory to begin with.\\n\\nNhat spotted that the memcg can be NULL in the memcg-disabled case, and I\\nwas then able to reproduce the crash locally as well.\\n\\n[1] https://github.com/libguestfs/libguestfs/issues/139\\n[2] https://bugzilla.redhat.com/show_bug.cgi?id=2275252\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.9\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:12:16.353Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35846\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:12:16.353Z\", \"dateReserved\": \"2024-05-17T13:50:33.105Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T14:47:25.503Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.