CVE-2026-80688 (GCVE-0-2026-80688)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-28 06:52
VLAI
Title
riscv: drop __init from vec_check_unaligned_access_speed_all_cpus
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: drop __init from vec_check_unaligned_access_speed_all_cpus This function runs within a kthread and need not necessarily finish before system finishes boot and free_initmem() unmaps the .init.text section. This function makes calls to SBI for probing unaligned access speed, and if this is slow for some reason (say some debug prints were added to SBI), the kthread can still be running at this point and result in an instruction page fault when trying to fetch from the freed region. [ 25.642087] Unable to handle kernel paging request at virtual address ffffffff80a04ef8 [ 25.646694] Current vec_check_unali pgtable: 4K pagesize, 48-bit VAs, pgdp=0x00004000316e9000 [ 25.653170] [ffffffff80a04ef8] pgd=000010004be7e401, p4d=000010004be7e401, pud=000010004be7e001, pmd=000010000c3000e3 [ 25.661244] Oops [#1] [ 25.662997] Modules linked in: [ 25.665357] CPU: 3 UID: 0 PID: 42 Comm: vec_check_unali Not tainted 7.0.0-tt-blackhole-asrinivasan-00007-g30ff73f18211 #570 PREEMPTLAZY [ 25.674669] Hardware name: Tenstorrent Blackhole (DT) [ 25.678545] epc : vec_check_unaligned_access_speed_all_cpus+0x18/0x2c [ 25.683458] ra : vec_check_unaligned_access_speed_all_cpus+0x18/0x2c [ 25.688372] epc : ffffffff80a04ef8 ra : ffffffff80a04ef8 sp : ffff8f8000203e20 [ 25.693874] gp : ffffffff814dc168 tp : ffffaf8001ad9900 t0 : 0000000000000000 [ 25.699401] t1 : fffffffffffffff0 t2 : ffffaf8001ad9a10 s0 : ffff8f8000203e30 [ 25.704912] s1 : ffffaf80018dc780 a0 : 0000000000000000 a1 : 0000000000000002 [ 25.710407] a2 : 00000000000001f0 a3 : 0000000000000018 a4 : 0000000000000000 [ 25.715917] a5 : 0000000000000000 a6 : ffffaf8001c03d98 a7 : ffffaf8001c03e30 [ 25.721419] s2 : ffff8f8000023c98 s3 : ffffaf8001aa1240 s4 : ffffffff80a04ee0 [ 25.726937] s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000 [ 25.732450] s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000 [ 25.737944] s11: 0000000000000000 t3 : 0000000000000002 t4 : 0000000000000402 [ 25.743481] t5 : 0000000000000040 t6 : 0000000000000004 ssp : 0000000000000000 [ 25.749024] status: 0000000200000120 badaddr: ffffffff80a04ef8 cause: 000000000000000c [ 25.755060] [<ffffffff80a04ef8>] vec_check_unaligned_access_speed_all_cpus+0x18/0x2c [ 25.760964] [<ffffffff80047a10>] kthread+0xd8/0xfc [ 25.764660] [<ffffffff80010c48>] ret_from_fork_kernel+0x18/0x1c4 [ 25.769220] [<ffffffff80895fe6>] ret_from_fork_kernel_asm+0x16/0x18 [ 25.774018] Code: cccc cccc cccc cccc cccc cccc cccc cccc cccc cccc (cccc) cccc Drop __init from its signature so that this doesn't happen.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a00e022be5315c5a1f47521a1cc6d3b71c8e9c44 , < 01bd01b61ad9ea917e5629a7f14f57a8af0543bb (git)
Affected: a00e022be5315c5a1f47521a1cc6d3b71c8e9c44 , < 25f228e6ac573884a3d7078cc2b3312b8db59eea (git)
Affected: a00e022be5315c5a1f47521a1cc6d3b71c8e9c44 , < f51fed61eea0daba2f95f1a6074085e4cd513c7b (git)
Affected: 86c19f641cfadcd7023bc8ee74849e85b1fdf187 (git)
Affected: dfef32cf33f4e09a5bfdc8a57603e0de506bed47 (git)
Affected: 6.13.11 , < 6.14 (semver)
Affected: 6.14.2 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kernel/unaligned_access_speed.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "01bd01b61ad9ea917e5629a7f14f57a8af0543bb",
              "status": "affected",
              "version": "a00e022be5315c5a1f47521a1cc6d3b71c8e9c44",
              "versionType": "git"
            },
            {
              "lessThan": "25f228e6ac573884a3d7078cc2b3312b8db59eea",
              "status": "affected",
              "version": "a00e022be5315c5a1f47521a1cc6d3b71c8e9c44",
              "versionType": "git"
            },
            {
              "lessThan": "f51fed61eea0daba2f95f1a6074085e4cd513c7b",
              "status": "affected",
              "version": "a00e022be5315c5a1f47521a1cc6d3b71c8e9c44",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "86c19f641cfadcd7023bc8ee74849e85b1fdf187",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dfef32cf33f4e09a5bfdc8a57603e0de506bed47",
              "versionType": "git"
            },
            {
              "lessThan": "6.14",
              "status": "affected",
              "version": "6.13.11",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kernel/unaligned_access_speed.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.13.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.14.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: drop __init from vec_check_unaligned_access_speed_all_cpus\n\nThis function runs within a kthread and need not necessarily finish\nbefore system finishes boot and free_initmem() unmaps the .init.text\nsection. This function makes calls to SBI for probing unaligned access\nspeed, and if this is slow for some reason (say some debug prints were\nadded to SBI), the kthread can still be running at this point and result\nin an instruction page fault when trying to fetch from the freed region.\n\n[   25.642087] Unable to handle kernel paging request at virtual address ffffffff80a04ef8\n[   25.646694] Current vec_check_unali pgtable: 4K pagesize, 48-bit VAs, pgdp=0x00004000316e9000\n[   25.653170] [ffffffff80a04ef8] pgd=000010004be7e401, p4d=000010004be7e401, pud=000010004be7e001, pmd=000010000c3000e3\n[   25.661244] Oops [#1]\n[   25.662997] Modules linked in:\n[   25.665357] CPU: 3 UID: 0 PID: 42 Comm: vec_check_unali Not tainted 7.0.0-tt-blackhole-asrinivasan-00007-g30ff73f18211 #570 PREEMPTLAZY\n[   25.674669] Hardware name: Tenstorrent Blackhole (DT)\n[   25.678545] epc : vec_check_unaligned_access_speed_all_cpus+0x18/0x2c\n[   25.683458]  ra : vec_check_unaligned_access_speed_all_cpus+0x18/0x2c\n[   25.688372] epc : ffffffff80a04ef8 ra : ffffffff80a04ef8 sp : ffff8f8000203e20\n[   25.693874]  gp : ffffffff814dc168 tp : ffffaf8001ad9900 t0 : 0000000000000000\n[   25.699401]  t1 : fffffffffffffff0 t2 : ffffaf8001ad9a10 s0 : ffff8f8000203e30\n[   25.704912]  s1 : ffffaf80018dc780 a0 : 0000000000000000 a1 : 0000000000000002\n[   25.710407]  a2 : 00000000000001f0 a3 : 0000000000000018 a4 : 0000000000000000\n[   25.715917]  a5 : 0000000000000000 a6 : ffffaf8001c03d98 a7 : ffffaf8001c03e30\n[   25.721419]  s2 : ffff8f8000023c98 s3 : ffffaf8001aa1240 s4 : ffffffff80a04ee0\n[   25.726937]  s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000\n[   25.732450]  s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000\n[   25.737944]  s11: 0000000000000000 t3 : 0000000000000002 t4 : 0000000000000402\n[   25.743481]  t5 : 0000000000000040 t6 : 0000000000000004 ssp : 0000000000000000\n[   25.749024] status: 0000000200000120 badaddr: ffffffff80a04ef8 cause: 000000000000000c\n[   25.755060] [\u003cffffffff80a04ef8\u003e] vec_check_unaligned_access_speed_all_cpus+0x18/0x2c\n[   25.760964] [\u003cffffffff80047a10\u003e] kthread+0xd8/0xfc\n[   25.764660] [\u003cffffffff80010c48\u003e] ret_from_fork_kernel+0x18/0x1c4\n[   25.769220] [\u003cffffffff80895fe6\u003e] ret_from_fork_kernel_asm+0x16/0x18\n[   25.774018] Code: cccc cccc cccc cccc cccc cccc cccc cccc cccc cccc (cccc) cccc\n\nDrop __init from its signature so that this doesn\u0027t happen."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:52:53.126Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/01bd01b61ad9ea917e5629a7f14f57a8af0543bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/25f228e6ac573884a3d7078cc2b3312b8db59eea"
        },
        {
          "url": "https://git.kernel.org/stable/c/f51fed61eea0daba2f95f1a6074085e4cd513c7b"
        }
      ],
      "title": "riscv: drop __init from vec_check_unaligned_access_speed_all_cpus",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80688",
    "datePublished": "2026-08-28T06:52:53.126Z",
    "dateReserved": "2026-08-26T14:34:25.784Z",
    "dateUpdated": "2026-08-28T06:52:53.126Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80688",
      "date": "2026-09-01",
      "epss": "0.00166",
      "percentile": "0.06091"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80688\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:54.270\",\"lastModified\":\"2026-08-28T08:16:54.270\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nriscv: drop __init from vec_check_unaligned_access_speed_all_cpus\\n\\nThis function runs within a kthread and need not necessarily finish\\nbefore system finishes boot and free_initmem() unmaps the .init.text\\nsection. This function makes calls to SBI for probing unaligned access\\nspeed, and if this is slow for some reason (say some debug prints were\\nadded to SBI), the kthread can still be running at this point and result\\nin an instruction page fault when trying to fetch from the freed region.\\n\\n[   25.642087] Unable to handle kernel paging request at virtual address ffffffff80a04ef8\\n[   25.646694] Current vec_check_unali pgtable: 4K pagesize, 48-bit VAs, pgdp=0x00004000316e9000\\n[   25.653170] [ffffffff80a04ef8] pgd=000010004be7e401, p4d=000010004be7e401, pud=000010004be7e001, pmd=000010000c3000e3\\n[   25.661244] Oops [#1]\\n[   25.662997] Modules linked in:\\n[   25.665357] CPU: 3 UID: 0 PID: 42 Comm: vec_check_unali Not tainted 7.0.0-tt-blackhole-asrinivasan-00007-g30ff73f18211 #570 PREEMPTLAZY\\n[   25.674669] Hardware name: Tenstorrent Blackhole (DT)\\n[   25.678545] epc : vec_check_unaligned_access_speed_all_cpus+0x18/0x2c\\n[   25.683458]  ra : vec_check_unaligned_access_speed_all_cpus+0x18/0x2c\\n[   25.688372] epc : ffffffff80a04ef8 ra : ffffffff80a04ef8 sp : ffff8f8000203e20\\n[   25.693874]  gp : ffffffff814dc168 tp : ffffaf8001ad9900 t0 : 0000000000000000\\n[   25.699401]  t1 : fffffffffffffff0 t2 : ffffaf8001ad9a10 s0 : ffff8f8000203e30\\n[   25.704912]  s1 : ffffaf80018dc780 a0 : 0000000000000000 a1 : 0000000000000002\\n[   25.710407]  a2 : 00000000000001f0 a3 : 0000000000000018 a4 : 0000000000000000\\n[   25.715917]  a5 : 0000000000000000 a6 : ffffaf8001c03d98 a7 : ffffaf8001c03e30\\n[   25.721419]  s2 : ffff8f8000023c98 s3 : ffffaf8001aa1240 s4 : ffffffff80a04ee0\\n[   25.726937]  s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000\\n[   25.732450]  s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000\\n[   25.737944]  s11: 0000000000000000 t3 : 0000000000000002 t4 : 0000000000000402\\n[   25.743481]  t5 : 0000000000000040 t6 : 0000000000000004 ssp : 0000000000000000\\n[   25.749024] status: 0000000200000120 badaddr: ffffffff80a04ef8 cause: 000000000000000c\\n[   25.755060] [\u003cffffffff80a04ef8\u003e] vec_check_unaligned_access_speed_all_cpus+0x18/0x2c\\n[   25.760964] [\u003cffffffff80047a10\u003e] kthread+0xd8/0xfc\\n[   25.764660] [\u003cffffffff80010c48\u003e] ret_from_fork_kernel+0x18/0x1c4\\n[   25.769220] [\u003cffffffff80895fe6\u003e] ret_from_fork_kernel_asm+0x16/0x18\\n[   25.774018] Code: cccc cccc cccc cccc cccc cccc cccc cccc cccc cccc (cccc) cccc\\n\\nDrop __init from its signature so that this doesn\u0027t happen.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/riscv/kernel/unaligned_access_speed.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a00e022be5315c5a1f47521a1cc6d3b71c8e9c44\",\"lessThan\":\"01bd01b61ad9ea917e5629a7f14f57a8af0543bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a00e022be5315c5a1f47521a1cc6d3b71c8e9c44\",\"lessThan\":\"25f228e6ac573884a3d7078cc2b3312b8db59eea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a00e022be5315c5a1f47521a1cc6d3b71c8e9c44\",\"lessThan\":\"f51fed61eea0daba2f95f1a6074085e4cd513c7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"86c19f641cfadcd7023bc8ee74849e85b1fdf187\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dfef32cf33f4e09a5bfdc8a57603e0de506bed47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.13.11\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.14.2\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/riscv/kernel/unaligned_access_speed.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01bd01b61ad9ea917e5629a7f14f57a8af0543bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/25f228e6ac573884a3d7078cc2b3312b8db59eea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f51fed61eea0daba2f95f1a6074085e4cd513c7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T07:05:36+00:00",
      "cve": "CVE-2026-80688",
      "id": "CVE-2026-80688",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: riscv: drop __init from vec_check_unaligned_access_speed_all_cpus",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80688.json",
      "version": "3"
    }
  }
}



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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

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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.