CVE-2022-50168 (GCVE-0-2022-50168)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:03 – Updated: 2025-06-18 11:03
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, x86: fix freeing of not-finalized bpf_prog_pack syzbot reported a few issues with bpf_prog_pack [1], [2]. This only happens with multiple subprogs. In jit_subprogs(), we first call bpf_int_jit_compile() on each sub program. And then, we call it on each sub program again. jit_data is not freed in the first call of bpf_int_jit_compile(). Similarly we don't call bpf_jit_binary_pack_finalize() in the first call of bpf_int_jit_compile(). If bpf_int_jit_compile() failed for one sub program, we will call bpf_jit_binary_pack_finalize() for this sub program. However, we don't have a chance to call it for other sub programs. Then we will hit "goto out_free" in jit_subprogs(), and call bpf_jit_free on some subprograms that haven't got bpf_jit_binary_pack_finalize() yet. At this point, bpf_jit_binary_pack_free() is called and the whole 2MB page is freed erroneously. Fix this with a custom bpf_jit_free() for x86_64, which calls bpf_jit_binary_pack_finalize() if necessary. Also, with custom bpf_jit_free(), bpf_prog_aux->use_bpf_prog_pack is not needed any more, remove it. [1] https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f [2] https://syzkaller.appspot.com/bug?extid=87f65c75f4a72db05445
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1022a5498f6f745c3b5fd3f050a5e11e7ca354f0 , < f91ce608a79c0db3e72bd63c23e011a9ebc31505 (git)
Affected: 1022a5498f6f745c3b5fd3f050a5e11e7ca354f0 , < 60e66074812dde9cde3d99cdd3caa9e40f1a4516 (git)
Affected: 1022a5498f6f745c3b5fd3f050a5e11e7ca354f0 , < 1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d (git)
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    Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 5.18.18 , ≤ 5.18.* (semver)
Unaffected: 5.19.2 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "arch/x86/net/bpf_jit_comp.c",
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            "kernel/bpf/core.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, x86: fix freeing of not-finalized bpf_prog_pack\n\nsyzbot reported a few issues with bpf_prog_pack [1], [2]. This only happens\nwith multiple subprogs. In jit_subprogs(), we first call bpf_int_jit_compile()\non each sub program. And then, we call it on each sub program again. jit_data\nis not freed in the first call of bpf_int_jit_compile(). Similarly we don\u0027t\ncall bpf_jit_binary_pack_finalize() in the first call of bpf_int_jit_compile().\n\nIf bpf_int_jit_compile() failed for one sub program, we will call\nbpf_jit_binary_pack_finalize() for this sub program. However, we don\u0027t have a\nchance to call it for other sub programs. Then we will hit \"goto out_free\" in\njit_subprogs(), and call bpf_jit_free on some subprograms that haven\u0027t got\nbpf_jit_binary_pack_finalize() yet.\n\nAt this point, bpf_jit_binary_pack_free() is called and the whole 2MB page is\nfreed erroneously.\n\nFix this with a custom bpf_jit_free() for x86_64, which calls\nbpf_jit_binary_pack_finalize() if necessary. Also, with custom\nbpf_jit_free(), bpf_prog_aux-\u003euse_bpf_prog_pack is not needed any more,\nremove it.\n\n[1] https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f\n[2] https://syzkaller.appspot.com/bug?extid=87f65c75f4a72db05445"
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          "url": "https://git.kernel.org/stable/c/1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d"
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    "cveId": "CVE-2022-50168",
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    "dateReserved": "2025-06-18T10:57:27.426Z",
    "dateUpdated": "2025-06-18T11:03:21.593Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50168\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:47.117\",\"lastModified\":\"2025-12-03T20:30:42.443\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf, x86: fix freeing of not-finalized bpf_prog_pack\\n\\nsyzbot reported a few issues with bpf_prog_pack [1], [2]. This only happens\\nwith multiple subprogs. In jit_subprogs(), we first call bpf_int_jit_compile()\\non each sub program. And then, we call it on each sub program again. jit_data\\nis not freed in the first call of bpf_int_jit_compile(). Similarly we don\u0027t\\ncall bpf_jit_binary_pack_finalize() in the first call of bpf_int_jit_compile().\\n\\nIf bpf_int_jit_compile() failed for one sub program, we will call\\nbpf_jit_binary_pack_finalize() for this sub program. However, we don\u0027t have a\\nchance to call it for other sub programs. Then we will hit \\\"goto out_free\\\" in\\njit_subprogs(), and call bpf_jit_free on some subprograms that haven\u0027t got\\nbpf_jit_binary_pack_finalize() yet.\\n\\nAt this point, bpf_jit_binary_pack_free() is called and the whole 2MB page is\\nfreed erroneously.\\n\\nFix this with a custom bpf_jit_free() for x86_64, which calls\\nbpf_jit_binary_pack_finalize() if necessary. Also, with custom\\nbpf_jit_free(), bpf_prog_aux-\u003euse_bpf_prog_pack is not needed any more,\\nremove it.\\n\\n[1] https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f\\n[2] https://syzkaller.appspot.com/bug?extid=87f65c75f4a72db05445\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, x86: se corrige la liberaci\u00f3n de bpf_prog_pack no finalizado. syzbot report\u00f3 algunos problemas con bpf_prog_pack [1], [2]. Esto solo ocurre con varios subprogramas. En jit_subprogs(), primero llamamos a bpf_int_jit_compile() en cada subprograma. Y luego, lo volvemos a llamar en cada subprograma. jit_data no se libera en la primera llamada de bpf_int_jit_compile(). De igual manera, no llamamos a bpf_jit_binary_pack_finalize() en la primera llamada de bpf_int_jit_compile(). Si bpf_int_jit_compile() falla en un subprograma, llamaremos a bpf_jit_binary_pack_finalize() para este subprograma. Sin embargo, no podemos llamarlo para otros subprogramas. Luego, pulsaremos \\\"goto out_free\\\" en jit_subprogs() y llamaremos a bpf_jit_free en algunos subprogramas que a\u00fan no tienen bpf_jit_binary_pack_finalize(). En este punto, se llama a bpf_jit_binary_pack_free() y se libera la p\u00e1gina completa de 2 MB por error. Se puede solucionar con un bpf_jit_free() personalizado para x86_64, que llama a bpf_jit_binary_pack_finalize() si es necesario. Adem\u00e1s, con bpf_jit_free() personalizado, bpf_prog_aux-\u0026gt;use_bpf_prog_pack ya no es necesario; elim\u00ednelo. [1] https://syzkaller.appspot.com/bug?extid=2f649ec6d2eea1495a8f [2] https://syzkaller.appspot.com/bug?extid=87f65c75f4a72db05445\"}],\"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: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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18\",\"versionEndExcluding\":\"5.18.18\",\"matchCriteriaId\":\"28A3BD94-A9B1-461A-9325-1B7EF7D364B6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.19\",\"versionEndExcluding\":\"5.19.2\",\"matchCriteriaId\":\"A1A2A5A5-4598-4D7E-BA07-4660398D6C8F\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/60e66074812dde9cde3d99cdd3caa9e40f1a4516\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f91ce608a79c0db3e72bd63c23e011a9ebc31505\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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  • 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.
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