CVE-2026-98724 (GCVE-0-2026-98724)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-19 09:24
VLAI
Title
nvmet: pci-epf: reject too-short SGL segments
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: pci-epf: reject too-short SGL segments The host controls an SGL segment's length. A nonzero length smaller than one SGL descriptor makes nr_descs zero, so nvmet_pci_epf_get_sgl_segment() reads the type byte of sgls[-1] outside the allocated buffer. If that byte contains a segment descriptor type, the function also copies the preceding 16 bytes and returns a negative descriptor count. The read was reproduced in 3/3 KASAN boots with only the host transfer mocked by a KUnit test: BUG: KASAN: slab-out-of-bounds in nvmet_pci_epf_get_sgl_segment Read of size 1 by task kunit_try_catch Call Trace: nvmet_pci_epf_get_sgl_segment nvmet_pci_epf_short_sgl_test Kernel panic - not syncing: KASAN: panic_on_warn set ... Reject segments that cannot hold one descriptor before allocating or transferring their contents.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 2423a05dd0f21330c47ce0ae1cb54a8b0be821e2 (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 472df1d103dbe3e9d09156f0667e36180e912c46 (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 5d5fbfbbacd1efb13a9bf91317d4fde859ede4b9 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/pci-epf.c"
          ],
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: pci-epf: reject too-short SGL segments\n\nThe host controls an SGL segment\u0027s length. A nonzero length smaller than\none SGL descriptor makes nr_descs zero, so\nnvmet_pci_epf_get_sgl_segment() reads the type byte of sgls[-1] outside\nthe allocated buffer. If that byte contains a segment descriptor type,\nthe function also copies the preceding 16 bytes and returns a negative\ndescriptor count.\n\nThe read was reproduced in 3/3 KASAN boots with only the host transfer\nmocked by a KUnit test:\n\n  BUG: KASAN: slab-out-of-bounds in nvmet_pci_epf_get_sgl_segment\n  Read of size 1 by task kunit_try_catch\n  Call Trace:\n   nvmet_pci_epf_get_sgl_segment\n   nvmet_pci_epf_short_sgl_test\n  Kernel panic - not syncing: KASAN: panic_on_warn set ...\n\nReject segments that cannot hold one descriptor before allocating or\ntransferring their contents."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:24:34.979Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "nvmet: pci-epf: reject too-short SGL segments",
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    "cveId": "CVE-2026-98724",
    "datePublished": "2026-10-18T15:47:01.614Z",
    "dateReserved": "2026-09-25T10:25:14.366Z",
    "dateUpdated": "2026-10-19T09:24:34.979Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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      "date": "2026-11-02",
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      "percentile": "0.09604"
    },
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      "cve": "CVE-2026-98724",
      "id": "msrc_CVE-2026-98724",
      "initial_release_date": "2026-10-20T22:24:34.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
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      "version": "2"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: pci-epf: reject too-short SGL segments\n\nThe host controls an SGL segment\u0027s length. A nonzero length smaller than\none SGL descriptor makes nr_descs zero, so\nnvmet_pci_epf_get_sgl_segment() reads the type byte of sgls[-1] outside\nthe allocated buffer. If that byte contains a segment descriptor type,\nthe function also copies the preceding 16 bytes and returns a negative\ndescriptor count.\n\nThe read was reproduced in 3/3 KASAN boots with only the host transfer\nmocked by a KUnit test:\n\n  BUG: KASAN: slab-out-of-bounds in nvmet_pci_epf_get_sgl_segment\n  Read of size 1 by task kunit_try_catch\n  Call Trace:\n   nvmet_pci_epf_get_sgl_segment\n   nvmet_pci_epf_short_sgl_test\n  Kernel panic - not syncing: KASAN: panic_on_warn set ...\n\nReject segments that cannot hold one descriptor before allocating or\ntransferring their contents."
          }
        ],
        "id": "CVE-2026-98724",
        "lastModified": "2026-10-19T10:19:36.590",
        "metrics": {},
        "published": "2026-10-18T16:17:26.020",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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      "cve": "CVE-2026-98724",
      "id": "CVE-2026-98724",
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      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvmet: pci-epf: reject too-short SGL segments",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98724.json",
      "version": "3"
    }
  }
}



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