CVE-2022-50168

{"id": "CVE-2022-50168", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"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"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2025-06-18T11:15:47.117", "references": [{"url": "https://git.kernel.org/stable/c/1d5f82d9dd477d5c66e0214a68c3e4f308eadd6d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/60e66074812dde9cde3d99cdd3caa9e40f1a4516", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f91ce608a79c0db3e72bd63c23e011a9ebc31505", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "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't\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't 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't 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->use_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->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"}], "lastModified": "2025-12-03T20:30:42.443", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "28A3BD94-A9B1-461A-9325-1B7EF7D364B6", "versionEndExcluding": "5.18.18", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A1A2A5A5-4598-4D7E-BA07-4660398D6C8F", "versionEndExcluding": "5.19.2", "versionStartIncluding": "5.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}