cve-2024-26689
Vulnerability from cvelistv5
Published
2024-04-03 14:54
Modified
2024-08-15 19:27
Severity
Summary
ceph: prevent use-after-free in encode_cap_msg()
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website


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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: prevent use-after-free in encode_cap_msg()\n\nIn fs/ceph/caps.c, in encode_cap_msg(), \"use after free\" error was\ncaught by KASAN at this line - \u0027ceph_buffer_get(arg-\u003exattr_buf);\u0027. This\nimplies before the refcount could be increment here, it was freed.\n\nIn same file, in \"handle_cap_grant()\" refcount is decremented by this\nline - \u0027ceph_buffer_put(ci-\u003ei_xattrs.blob);\u0027. It appears that a race\noccurred and resource was freed by the latter line before the former\nline could increment it.\n\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\narg-\u003exattr_buf is assigned to ci-\u003ei_xattrs.blob. This is the spot where\nthe refcount must be increased to prevent \"use after free\" error."
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    "dateReserved": "2024-02-19T14:20:24.154Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26689\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T15:15:52.427\",\"lastModified\":\"2024-06-25T22:15:21.047\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nceph: prevent use-after-free in encode_cap_msg()\\n\\nIn fs/ceph/caps.c, in encode_cap_msg(), \\\"use after free\\\" error was\\ncaught by KASAN at this line - \u0027ceph_buffer_get(arg-\u003exattr_buf);\u0027. This\\nimplies before the refcount could be increment here, it was freed.\\n\\nIn same file, in \\\"handle_cap_grant()\\\" refcount is decremented by this\\nline - \u0027ceph_buffer_put(ci-\u003ei_xattrs.blob);\u0027. It appears that a race\\noccurred and resource was freed by the latter line before the former\\nline could increment it.\\n\\nencode_cap_msg() is called by __send_cap() and __send_cap() is called by\\nceph_check_caps() after calling __prep_cap(). __prep_cap() is where\\narg-\u003exattr_buf is assigned to ci-\u003ei_xattrs.blob. This is the spot where\\nthe refcount must be increased to prevent \\\"use after free\\\" error.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ceph: evita el use-after-free en encode_cap_msg() En fs/ceph/caps.c, en encode_cap_msg(), KASAN detect\u00f3 el error \\\"use after free\\\" en este l\u00ednea - \u0027ceph_buffer_get(arg-\u0026gt;xattr_buf);\u0027. Esto implica que antes de que el recuento pudiera incrementarse aqu\u00ed, fue liberado. En el mismo archivo, en \\\"handle_cap_grant()\\\", el refcount se reduce en esta l\u00ednea: \u0027ceph_buffer_put(ci-\u0026gt;i_xattrs.blob);\u0027. Parece que se produjo una ejecuci\u00f3n y la \u00faltima l\u00ednea liber\u00f3 el recurso antes de que la primera l\u00ednea pudiera incrementarlo. __send_cap() llama a encode_cap_msg() y ceph_check_caps() llama a __send_cap() despu\u00e9s de llamar a __prep_cap(). __prep_cap() es donde arg-\u0026gt;xattr_buf se asigna a ci-\u0026gt;i_xattrs.blob. Este es el punto donde se debe aumentar el recuento para evitar el error \\\"use after free\\\".\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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