cve-2025-21655
Vulnerability from cvelistv5
Published
2025-01-20 13:48
Modified
2025-02-23 07:15
Severity ?
EPSS score ?
0.04% (0.10323)
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://project-zero.issues.chromium.org/issues/388499293
Impacted products
Vendor Product Version
Linux Linux Version: 21a091b970cdbcf3e8ff829234b51be6f9192766
Version: 21a091b970cdbcf3e8ff829234b51be6f9192766
Version: 21a091b970cdbcf3e8ff829234b51be6f9192766
Version: 21a091b970cdbcf3e8ff829234b51be6f9192766
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   Linux Linux Version: 6.1
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{
   containers: {
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "io_uring/eventfd.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "6b63308c28987c6010b1180c72a6db4df6c68033",
                     status: "affected",
                     version: "21a091b970cdbcf3e8ff829234b51be6f9192766",
                     versionType: "git",
                  },
                  {
                     lessThan: "8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10",
                     status: "affected",
                     version: "21a091b970cdbcf3e8ff829234b51be6f9192766",
                     versionType: "git",
                  },
                  {
                     lessThan: "a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7",
                     status: "affected",
                     version: "21a091b970cdbcf3e8ff829234b51be6f9192766",
                     versionType: "git",
                  },
                  {
                     lessThan: "c9a40292a44e78f71258b8522655bffaf5753bdb",
                     status: "affected",
                     version: "21a091b970cdbcf3e8ff829234b51be6f9192766",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "io_uring/eventfd.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "6.1",
                  },
                  {
                     lessThan: "6.1",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.125",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.72",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.12.*",
                     status: "unaffected",
                     version: "6.12.10",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.13",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/eventfd: ensure io_eventfd_signal() defers another RCU period\n\nio_eventfd_do_signal() is invoked from an RCU callback, but when\ndropping the reference to the io_ev_fd, it calls io_eventfd_free()\ndirectly if the refcount drops to zero. This isn't correct, as any\npotential freeing of the io_ev_fd should be deferred another RCU grace\nperiod.\n\nJust call io_eventfd_put() rather than open-code the dec-and-test and\nfree, which will correctly defer it another RCU grace period.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2025-02-23T07:15:02.767Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033",
            },
            {
               url: "https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10",
            },
            {
               url: "https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7",
            },
            {
               url: "https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb",
            },
            {
               url: "https://project-zero.issues.chromium.org/issues/388499293",
            },
         ],
         title: "io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2025-21655",
      datePublished: "2025-01-20T13:48:40.544Z",
      dateReserved: "2024-12-29T08:45:45.729Z",
      dateUpdated: "2025-02-23T07:15:02.767Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2025-21655\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-01-20T14:15:27.027\",\"lastModified\":\"2025-02-23T08:15:09.213\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nio_uring/eventfd: ensure io_eventfd_signal() defers another RCU period\\n\\nio_eventfd_do_signal() is invoked from an RCU callback, but when\\ndropping the reference to the io_ev_fd, it calls io_eventfd_free()\\ndirectly if the refcount drops to zero. This isn't correct, as any\\npotential freeing of the io_ev_fd should be deferred another RCU grace\\nperiod.\\n\\nJust call io_eventfd_put() rather than open-code the dec-and-test and\\nfree, which will correctly defer it another RCU grace period.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring/eventfd: garantizar que io_eventfd_signal() posponga otro período de RCU io_eventfd_do_signal() se invoca desde una devolución de llamada de RCU, pero al eliminar la referencia a io_ev_fd, llama a io_eventfd_free() directamente si El recuento cae a cero. Esto no es correcto, ya que cualquier posible liberación de io_ev_fd debería posponerse otro período de gracia de RCU. Simplemente llame a io_eventfd_put() en lugar de abrir el código dec-and-test y free, lo que lo diferirá correctamente a otro período de gracia de RCU.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://project-zero.issues.chromium.org/issues/388499293\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
   },
}


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