CVE-2022-49026 (GCVE-0-2022-49026)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2026-08-05 08:53
VLAI
Title
e100: Fix possible use after free in e100_xmit_prepare
Summary
In the Linux kernel, the following vulnerability has been resolved: e100: Fix possible use after free in e100_xmit_prepare In e100_xmit_prepare(), if we can't map the skb, then return -ENOMEM, so e100_xmit_frame() will return NETDEV_TX_BUSY and the upper layer will resend the skb. But the skb is already freed, which will cause UAF bug when the upper layer resends the skb. Remove the harmful free.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:11 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5e5d49422dfb035ca9e280cd61d434095c151272 , < b775f37d943966f6f77dca402f5a9dedce502c25 (git)
Affected: 5e5d49422dfb035ca9e280cd61d434095c151272 , < 9fc27d22cdb9b1fcd754599d216a8992fed280cd (git)
Affected: 5e5d49422dfb035ca9e280cd61d434095c151272 , < b46f6144ab89d3d757ead940759c505091626a7d (git)
Affected: 5e5d49422dfb035ca9e280cd61d434095c151272 , < 45605c75c52c7ae7bfe902214343aabcfe5ba0ff (git)
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Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 5.10.158 , ≤ 5.10.* (semver)
Unaffected: 5.15.82 , ≤ 5.15.* (semver)
Unaffected: 6.0.12 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:45:13+00:00",
      "cve": "CVE-2022-49026",
      "id": "CVE-2022-49026",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: e100: Fix possible use after free in e100_xmit_prepare",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49026.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T01:24:00Z",
      "cve": "CVE-2022-49026",
      "id": "CVE-2022-49026",
      "initial_release_date": "2024-10-22T14:21:59Z",
      "product_status:known_affected": "480",
      "product_status:known_not_affected": "118",
      "product_status:recommended": "434",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49026",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49026.json",
      "version": "52"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49026\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:11:54.975076Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:11:58.244Z\"}}], \"cna\": {\"title\": \"e100: Fix possible use after free in e100_xmit_prepare\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The UAF is in the e100 ndo_start_xmit path (e100_xmit_frame \\u2192 e100_exec_cb \\u2192 e100_xmit_prepare), reached when a local process transmits via an ordinary socket send routed over the e100 netdev; remote peers do not parse into this TX-prepare path.\\nAC:L - Once DMA mapping fails, the free-then-NETDEV_TX_BUSY requeue UAF is deterministic with no race; a local attacker can induce mapping failure by exhausting swiotlb/IOMMU resources against this 32-bit DMA device, which is within attacker influence.\\nPR:L - Any unprivileged local user can send packets out an up e100 interface through the generic networking stack; no CAP_NET_ADMIN or other capability is required on the transmit path.\\nUI:N - The attacker triggers the TX path and resource exhaustion themselves via their own send syscalls; no victim action is required.\\nS:U - This is a standard in-kernel skb heap UAF enabling local privilege escalation within the same kernel security authority, with no VM, IOMMU, or sandbox boundary crossed.\\nC:H - Use-after-free of the requeued skb allows heap spraying and reuse of the freed object, enabling arbitrary kernel memory disclosure primitives.\\nI:H - The same skb UAF (and the dangling cb-\u003eskb later freed again in e100_clean_cbs) enables heap corruption and write primitives suitable for control-flow hijacking or arbitrary kernel writes.\\nA:H - Reusing the freed skb on TX retry or interface cleanup reliably causes kernel oops/panic even without a full exploit.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5e5d49422dfb035ca9e280cd61d434095c151272\", \"lessThan\": \"b775f37d943966f6f77dca402f5a9dedce502c25\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e5d49422dfb035ca9e280cd61d434095c151272\", \"lessThan\": \"9fc27d22cdb9b1fcd754599d216a8992fed280cd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e5d49422dfb035ca9e280cd61d434095c151272\", \"lessThan\": \"b46f6144ab89d3d757ead940759c505091626a7d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5e5d49422dfb035ca9e280cd61d434095c151272\", \"lessThan\": \"45605c75c52c7ae7bfe902214343aabcfe5ba0ff\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/ethernet/intel/e100.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.158\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.82\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/intel/e100.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b775f37d943966f6f77dca402f5a9dedce502c25\"}, {\"url\": \"https://git.kernel.org/stable/c/9fc27d22cdb9b1fcd754599d216a8992fed280cd\"}, {\"url\": \"https://git.kernel.org/stable/c/b46f6144ab89d3d757ead940759c505091626a7d\"}, {\"url\": \"https://git.kernel.org/stable/c/45605c75c52c7ae7bfe902214343aabcfe5ba0ff\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ne100: Fix possible use after free in e100_xmit_prepare\\n\\nIn e100_xmit_prepare(), if we can\u0027t map the skb, then return -ENOMEM, so\\ne100_xmit_frame() will return NETDEV_TX_BUSY and the upper layer will\\nresend the skb. But the skb is already freed, which will cause UAF bug\\nwhen the upper layer resends the skb.\\n\\nRemove the harmful free.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.158\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.82\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.12\", \"versionStartIncluding\": \"4.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"4.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:53:32.469Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49026\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:53:32.469Z\", \"dateReserved\": \"2024-08-22T01:27:53.651Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:06:31.876Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.