CVE-2024-56558 (GCVE-0-2024-56558)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:23 – Updated: 2026-08-05 11:45
VLAI
Title
nfsd: make sure exp active before svc_export_show
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: make sure exp active before svc_export_show The function `e_show` was called with protection from RCU. This only ensures that `exp` will not be freed. Therefore, the reference count for `exp` can drop to zero, which will trigger a refcount use-after-free warning when `exp_get` is called. To resolve this issue, use `cache_get_rcu` to ensure that `exp` remains active. ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 3 PID: 819 at lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 ... Call Trace: <TASK> e_show+0x20b/0x230 [nfsd] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e
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: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-11 15:42 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < e2fa0d0e327279a8defb87b263cd0bf288fd9261 (git)
Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < 7fd29d284b55c2274f7a748e6c5f25b4758b8da5 (git)
Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < 6cefcadd34e3c71c81ea64b899a0daa86314a51a (git)
Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < 7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec (git)
Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < 1cecfdbc6bfc89c516d286884c7f29267b95de2b (git)
Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < 7365d1f8de63cffdbbaa2287ce0205438e1a922f (git)
Affected: bf18f163e89c52e09c96534db45c4274273a0b34 , < be8f982c369c965faffa198b46060f8853e0f1f0 (git)
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Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.12.4 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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{
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              "userInteraction": "NONE",
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            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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        "title": "CVE Program Container"
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    "cna": {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: make sure exp active before svc_export_show\n\nThe function `e_show` was called with protection from RCU. This only\nensures that `exp` will not be freed. Therefore, the reference count for\n`exp` can drop to zero, which will trigger a refcount use-after-free\nwarning when `exp_get` is called. To resolve this issue, use\n`cache_get_rcu` to ensure that `exp` remains active.\n\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 3 PID: 819 at lib/refcount.c:25\nrefcount_warn_saturate+0xb1/0x120\nCPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb1/0x120\n...\nCall Trace:\n \u003cTASK\u003e\n e_show+0x20b/0x230 [nfsd]\n seq_read_iter+0x589/0x770\n seq_read+0x1e5/0x270\n vfs_read+0x125/0x530\n ksys_read+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e"
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable `e_show()` path is only entered via `read()` on local pseudo-files (`/proc/fs/nfs/exports`, `/proc/fs/nfsd/exports`, `/proc/fs/nfsd/export_stats`); no remote NFS request reaches this seq_file code.\nAC:L - The attacker fully controls the triggering side and can loop reads across many threads indefinitely, while the freeing side (sunrpc `cache_clean` expiry of export/negative entries) runs continuously on any active NFS server and can be further churned by unauthenticated RPC traffic to local nfsd, so the race is repeatable at will.\nPR:L - `/proc/fs/nfs/exports` defaults to 0444 (`proc_create` mode 0 \u2192 `S_IRUGO`) and `/proc/fs/nfsd/{exports,export_stats}` are registered `S_IRUGO` under a 0755 directory, so any unprivileged local user can read them \u2014 no capability, namespace trick, or root required.\nUI:N - The attacker performs the read itself; no action by any other user or administrator is needed.\nS:U - The refcount underflow and subsequent use-after-free are confined to the kernel\u0027s own memory and the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `svc_export_show()` reads already-freed memory (`ex_stats` was `kfree()`d non-RCU, `ex_client` auth_domain released, `ex_path` dentry/mnt put) and formats it into the seq buffer returned to the unprivileged reader, and the freed percpu counter pointer yields a wild read \u2014 a direct kernel heap information disclosure that reclaimed-slab grooming makes attacker-influenceable.\nI:H - On the affected 4.20+ trees without zero-checking `refcount_t`, the bogus 0\u21921 increment is followed by a matching put that re-runs `svc_export_put()`, producing double `kfree()` of `ex_stats`/`ex_uuid`, double `path_put()`/`auth_domain_put()` and a double `kfree_rcu()` \u2014 a double-free/refcount-underflow primitive on kmalloc objects that is a well-established route to arbitrary write and privilege escalation.\nA:H - The `refcount_t: addition on 0` WARNING is an oops splat (immediate panic with `panic_on_warn`), and dereferencing the freed `ex_stats` percpu pointer plus the double-free of dentry/mount/auth_domain references reliably crash the kernel \u2014 an unprivileged user can trigger this repeatedly."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:45:06.425Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e2fa0d0e327279a8defb87b263cd0bf288fd9261"
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        {
          "url": "https://git.kernel.org/stable/c/7fd29d284b55c2274f7a748e6c5f25b4758b8da5"
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        {
          "url": "https://git.kernel.org/stable/c/6cefcadd34e3c71c81ea64b899a0daa86314a51a"
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        {
          "url": "https://git.kernel.org/stable/c/7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec"
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        {
          "url": "https://git.kernel.org/stable/c/be8f982c369c965faffa198b46060f8853e0f1f0"
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      ],
      "title": "nfsd: make sure exp active before svc_export_show",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56558",
    "datePublished": "2024-12-27T14:23:03.902Z",
    "dateReserved": "2024-12-27T14:03:05.992Z",
    "dateUpdated": "2026-08-05T11:45:06.425Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-56558",
      "date": "2026-08-25",
      "epss": "0.00241",
      "percentile": "0.1497"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56558\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T15:15:14.633\",\"lastModified\":\"2026-06-17T08:12:23.337\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: make sure exp active before svc_export_show\\n\\nThe function `e_show` was called with protection from RCU. This only\\nensures that `exp` will not be freed. Therefore, the reference count for\\n`exp` can drop to zero, which will trigger a refcount use-after-free\\nwarning when `exp_get` is called. To resolve this issue, use\\n`cache_get_rcu` to ensure that `exp` remains active.\\n\\n------------[ cut here ]------------\\nrefcount_t: addition on 0; use-after-free.\\nWARNING: CPU: 3 PID: 819 at lib/refcount.c:25\\nrefcount_warn_saturate+0xb1/0x120\\nCPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n1.16.1-2.fc37 04/01/2014\\nRIP: 0010:refcount_warn_saturate+0xb1/0x120\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n e_show+0x20b/0x230 [nfsd]\\n seq_read_iter+0x589/0x770\\n seq_read+0x1e5/0x270\\n vfs_read+0x125/0x530\\n ksys_read+0xc1/0x160\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: aseg\u00farese de que exp est\u00e9 activo antes de svc_export_show La funci\u00f3n `e_show` se llam\u00f3 con protecci\u00f3n de RCU. Esto solo garantiza que `exp` no se liberar\u00e1. Por lo tanto, el recuento de referencia para `exp` puede caer a cero, lo que activar\u00e1 una advertencia de use-after-free de refcount cuando se llame a `exp_get`. Para resolver este problema, use `cache_get_rcu` para asegurarse de que `exp` permanezca activo. ------------[ cortar aqu\u00ed ]------------ refcount_t: adici\u00f3n en 0; use-after-free. ADVERTENCIA: CPU: 3 PID: 819 en lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 3 UID: 0 PID: 819 Comm: cat No contaminado 6.12.0-rc3+ #1 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 01/04/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 ... Seguimiento de llamadas:  e_show+0x20b/0x230 [nfsd] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 hacer_syscall_64+0x5f/0x170 entrada_SYSCALL_64_despu\u00e9s_hwframe+0x76/0x7e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/export.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"e2fa0d0e327279a8defb87b263cd0bf288fd9261\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"7fd29d284b55c2274f7a748e6c5f25b4758b8da5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"6cefcadd34e3c71c81ea64b899a0daa86314a51a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"1cecfdbc6bfc89c516d286884c7f29267b95de2b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"7365d1f8de63cffdbbaa2287ce0205438e1a922f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bf18f163e89c52e09c96534db45c4274273a0b34\",\"lessThan\":\"be8f982c369c965faffa198b46060f8853e0f1f0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/export.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.287\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.231\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.174\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.120\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.64\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.4\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-02-11T15:42:49.247633Z\",\"id\":\"CVE-2024-56558\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.17\",\"versionEndExcluding\":\"5.4.287\",\"matchCriteriaId\":\"4370C192-9AA4-40FC-B36F-C7ECD643414F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.231\",\"matchCriteriaId\":\"B5C644CC-2BD7-4E32-BC54-8DCC7ABE9935\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.174\",\"matchCriteriaId\":\"419FD073-1517-4FD5-8158-F94BC68A1E89\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.120\",\"matchCriteriaId\":\"09AC6122-E2A4-40FE-9D33-268A1B2EC265\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.64\",\"matchCriteriaId\":\"CA16DEE3-ABEC-4449-9F4A-7A3DC4FC36C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.4\",\"matchCriteriaId\":\"04756810-D093-4B43-B1D9-CF5035968061\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1cecfdbc6bfc89c516d286884c7f29267b95de2b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6cefcadd34e3c71c81ea64b899a0daa86314a51a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7365d1f8de63cffdbbaa2287ce0205438e1a922f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7fd29d284b55c2274f7a748e6c5f25b4758b8da5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/be8f982c369c965faffa198b46060f8853e0f1f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e2fa0d0e327279a8defb87b263cd0bf288fd9261\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:01:25+00:00",
      "cve": "CVE-2024-56558",
      "id": "CVE-2024-56558",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: make sure exp active before svc_export_show",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56558.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T20:49:29.154Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-56558\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-11T15:42:49.247633Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-11T15:42:50.585Z\"}}], \"cna\": {\"title\": \"nfsd: make sure exp active before svc_export_show\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"e2fa0d0e327279a8defb87b263cd0bf288fd9261\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"7fd29d284b55c2274f7a748e6c5f25b4758b8da5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"6cefcadd34e3c71c81ea64b899a0daa86314a51a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"1cecfdbc6bfc89c516d286884c7f29267b95de2b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"7365d1f8de63cffdbbaa2287ce0205438e1a922f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bf18f163e89c52e09c96534db45c4274273a0b34\", \"lessThan\": \"be8f982c369c965faffa198b46060f8853e0f1f0\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/export.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.287\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.231\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.174\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/export.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e2fa0d0e327279a8defb87b263cd0bf288fd9261\"}, {\"url\": \"https://git.kernel.org/stable/c/7fd29d284b55c2274f7a748e6c5f25b4758b8da5\"}, {\"url\": \"https://git.kernel.org/stable/c/6cefcadd34e3c71c81ea64b899a0daa86314a51a\"}, {\"url\": \"https://git.kernel.org/stable/c/7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec\"}, {\"url\": \"https://git.kernel.org/stable/c/1cecfdbc6bfc89c516d286884c7f29267b95de2b\"}, {\"url\": \"https://git.kernel.org/stable/c/7365d1f8de63cffdbbaa2287ce0205438e1a922f\"}, {\"url\": \"https://git.kernel.org/stable/c/be8f982c369c965faffa198b46060f8853e0f1f0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: make sure exp active before svc_export_show\\n\\nThe function `e_show` was called with protection from RCU. This only\\nensures that `exp` will not be freed. Therefore, the reference count for\\n`exp` can drop to zero, which will trigger a refcount use-after-free\\nwarning when `exp_get` is called. To resolve this issue, use\\n`cache_get_rcu` to ensure that `exp` remains active.\\n\\n------------[ cut here ]------------\\nrefcount_t: addition on 0; use-after-free.\\nWARNING: CPU: 3 PID: 819 at lib/refcount.c:25\\nrefcount_warn_saturate+0xb1/0x120\\nCPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n1.16.1-2.fc37 04/01/2014\\nRIP: 0010:refcount_warn_saturate+0xb1/0x120\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n e_show+0x20b/0x230 [nfsd]\\n seq_read_iter+0x589/0x770\\n seq_read+0x1e5/0x270\\n vfs_read+0x125/0x530\\n ksys_read+0xc1/0x160\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.287\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.231\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.174\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.120\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.64\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.4\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"3.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:58:18.903Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56558\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T20:49:29.154Z\", \"dateReserved\": \"2024-12-27T14:03:05.992Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-27T14:23:03.902Z\", \"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.