CVE-2025-21857 (GCVE-0-2025-21857)
Vulnerability from cvelistv5
Published
2025-03-12 09:42
Modified
2025-05-04 07:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: fix error handling causing NULL dereference tcf_exts_miss_cookie_base_alloc() calls xa_alloc_cyclic() which can return 1 if the allocation succeeded after wrapping. This was treated as an error, with value 1 returned to caller tcf_exts_init_ex() which sets exts->actions to NULL and returns 1 to caller fl_change(). fl_change() treats err == 1 as success, calling tcf_exts_validate_ex() which calls tcf_action_init() with exts->actions as argument, where it is dereferenced. Example trace: BUG: kernel NULL pointer dereference, address: 0000000000000000 CPU: 114 PID: 16151 Comm: handler114 Kdump: loaded Not tainted 5.14.0-503.16.1.el9_5.x86_64 #1 RIP: 0010:tcf_action_init+0x1f8/0x2c0 Call Trace: tcf_action_init+0x1f8/0x2c0 tcf_exts_validate_ex+0x175/0x190 fl_change+0x537/0x1120 [cls_flower]
References
Impacted products
Vendor Product Version
Linux Linux Version: 80cd22c35c9001fe72bf614d29439de41933deca
Version: 80cd22c35c9001fe72bf614d29439de41933deca
Version: 80cd22c35c9001fe72bf614d29439de41933deca
Version: 80cd22c35c9001fe72bf614d29439de41933deca
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{
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          "product": "Linux",
          "programFiles": [
            "net/sched/cls_api.c"
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    "cveId": "CVE-2025-21857",
    "datePublished": "2025-03-12T09:42:10.622Z",
    "dateReserved": "2024-12-29T08:45:45.780Z",
    "dateUpdated": "2025-05-04T07:22:39.626Z",
    "state": "PUBLISHED"
  },
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21857\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-12T10:15:18.583\",\"lastModified\":\"2025-03-13T21:15:46.950\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: cls_api: fix error handling causing NULL dereference\\n\\ntcf_exts_miss_cookie_base_alloc() calls xa_alloc_cyclic() which can\\nreturn 1 if the allocation succeeded after wrapping. This was treated as\\nan error, with value 1 returned to caller tcf_exts_init_ex() which sets\\nexts-\u003eactions to NULL and returns 1 to caller fl_change().\\n\\nfl_change() treats err == 1 as success, calling tcf_exts_validate_ex()\\nwhich calls tcf_action_init() with exts-\u003eactions as argument, where it\\nis dereferenced.\\n\\nExample trace:\\n\\nBUG: kernel NULL pointer dereference, address: 0000000000000000\\nCPU: 114 PID: 16151 Comm: handler114 Kdump: loaded Not tainted 5.14.0-503.16.1.el9_5.x86_64 #1\\nRIP: 0010:tcf_action_init+0x1f8/0x2c0\\nCall Trace:\\n tcf_action_init+0x1f8/0x2c0\\n tcf_exts_validate_ex+0x175/0x190\\n fl_change+0x537/0x1120 [cls_flower]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: cls_api: se corrige el error de gesti\u00f3n que causa la desreferencia de NULL. tcf_exts_miss_cookie_base_alloc() llama a xa_alloc_cyclic(), que puede devolver 1 si la asignaci\u00f3n se realiz\u00f3 correctamente tras el encapsulado. Esto se trat\u00f3 como un error, con el valor 1 devuelto al llamador tcf_exts_init_ex(), que establece exts-\u0026gt;actions en NULL y devuelve 1 al llamador fl_change(). fl_change() trata err == 1 como correcto, llamando a tcf_exts_validate_ex(), que llama a tcf_action_init() con exts-\u0026gt;actions como argumento, donde se desreferencia. Ejemplo de seguimiento: ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000000 CPU: 114 PID: 16151 Comm: handler114 Kdump: cargado No contaminado 5.14.0-503.16.1.el9_5.x86_64 #1 RIP: 0010:tcf_action_init+0x1f8/0x2c0 Seguimiento de llamadas: tcf_action_init+0x1f8/0x2c0 tcf_exts_validate_ex+0x175/0x190 fl_change+0x537/0x1120 [cls_flower]\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.3\",\"versionEndExcluding\":\"6.6.80\",\"matchCriteriaId\":\"ACF3631C-19E5-4953-B4A3-AB7CD48E6A57\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.17\",\"matchCriteriaId\":\"15370AEE-6D1C-49C3-8CB7-E889D5F92B6F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.5\",\"matchCriteriaId\":\"72E69ABB-9015-43A6-87E1-5150383CFFD9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"186716B6-2B66-4BD0-852E-D48E71C0C85F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D3E781C-403A-498F-9DA9-ECEE50F41E75\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"66619FB8-0AAF-4166-B2CF-67B24143261D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/071ed42cff4fcdd89025d966d48eabef59913bf2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3c74b5787caf59bb1e9c5fe0a360643a71eb1e8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3e4c56cf41876ef2a82f0877fe2a67648f8632b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/de4b679aa3b4da7ec34f639df068b914f20e3c3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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