CVE-2024-26870 (GCVE-0-2024-26870)
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2026-08-05 11:28
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102 A call to listxattr() with a buffer size = 0 returns the actual size of the buffer needed for a subsequent call. When size > 0, nfs4_listxattr() does not return an error because either generic_listxattr() or nfs4_listxattr_nfs4_label() consumes exactly all the bytes then size is 0 when calling nfs4_listxattr_nfs4_user() which then triggers the following kernel BUG: [ 99.403778] kernel BUG at mm/usercopy.c:102! [ 99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1 [ 99.415827] Call trace: [ 99.415985] usercopy_abort+0x70/0xa0 [ 99.416227] __check_heap_object+0x134/0x158 [ 99.416505] check_heap_object+0x150/0x188 [ 99.416696] __check_object_size.part.0+0x78/0x168 [ 99.416886] __check_object_size+0x28/0x40 [ 99.417078] listxattr+0x8c/0x120 [ 99.417252] path_listxattr+0x78/0xe0 [ 99.417476] __arm64_sys_listxattr+0x28/0x40 [ 99.417723] invoke_syscall+0x78/0x100 [ 99.417929] el0_svc_common.constprop.0+0x48/0xf0 [ 99.418186] do_el0_svc+0x24/0x38 [ 99.418376] el0_svc+0x3c/0x110 [ 99.418554] el0t_64_sync_handler+0x120/0x130 [ 99.418788] el0t_64_sync+0x194/0x198 [ 99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000) Issue is reproduced when generic_listxattr() returns 'system.nfs4_acl', thus calling lisxattr() with size = 16 will trigger the bug. Add check on nfs4_listxattr() to return ERANGE error when it is called with size > 0 and the return value is greater than size.
References
Impacted products
Vendor Product Version
Linux Linux Version: 012a211abd5db098094ce429de5f046368391e68
Version: 012a211abd5db098094ce429de5f046368391e68
Version: 012a211abd5db098094ce429de5f046368391e68
Version: 012a211abd5db098094ce429de5f046368391e68
Version: 012a211abd5db098094ce429de5f046368391e68
Version: 012a211abd5db098094ce429de5f046368391e68
Version: 012a211abd5db098094ce429de5f046368391e68
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\n\nA call to listxattr() with a buffer size = 0 returns the actual\nsize of the buffer needed for a subsequent call. When size \u003e 0,\nnfs4_listxattr() does not return an error because either\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\nexactly all the bytes then size is 0 when calling\nnfs4_listxattr_nfs4_user() which then triggers the following\nkernel BUG:\n\n  [   99.403778] kernel BUG at mm/usercopy.c:102!\n  [   99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n  [   99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\n  [   99.415827] Call trace:\n  [   99.415985]  usercopy_abort+0x70/0xa0\n  [   99.416227]  __check_heap_object+0x134/0x158\n  [   99.416505]  check_heap_object+0x150/0x188\n  [   99.416696]  __check_object_size.part.0+0x78/0x168\n  [   99.416886]  __check_object_size+0x28/0x40\n  [   99.417078]  listxattr+0x8c/0x120\n  [   99.417252]  path_listxattr+0x78/0xe0\n  [   99.417476]  __arm64_sys_listxattr+0x28/0x40\n  [   99.417723]  invoke_syscall+0x78/0x100\n  [   99.417929]  el0_svc_common.constprop.0+0x48/0xf0\n  [   99.418186]  do_el0_svc+0x24/0x38\n  [   99.418376]  el0_svc+0x3c/0x110\n  [   99.418554]  el0t_64_sync_handler+0x120/0x130\n  [   99.418788]  el0t_64_sync+0x194/0x198\n  [   99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\n\nIssue is reproduced when generic_listxattr() returns \u0027system.nfs4_acl\u0027,\nthus calling lisxattr() with size = 16 will trigger the bug.\n\nAdd check on nfs4_listxattr() to return ERANGE error when it is\ncalled with size \u003e 0 and the return value is greater than size."
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              "value": "AV:L - The vulnerability is triggered by a local `listxattr(2)`/`llistxattr(2)`/`flistxattr(2)` syscall on a file residing on an NFSv4 mount; no network peer can initiate it on its own. Although the overflow content is supplied by the NFS server over the wire, a local syscall is required to reach the code, so the attack vector is Local.\nAC:L - Triggering is fully deterministic \u2014 the attacker probes with `size = 0`, then calls `listxattr()` with a size exactly equal to the generic handler list (16 bytes for `\"system.nfs4_acl\\0\"`), with no race to win and no memory-layout condition outside their control. The required config (CONFIG_NFS_V4_2, CONFIG_NFS_V4_SECURITY_LABEL, CONFIG_HARDENED_USERCOPY) is enabled by default on mainstream distributions, as demonstrated by the reporter reproducing on a stock Fedora 40 kernel.\nPR:L - Any unprivileged local user with ordinary access to a file on an existing NFSv4.2 mount can call `listxattr()` and set the `user.*` xattrs that become the overflow payload; no capabilities are needed. NFS-mounted home directories on shared/multi-user hosts make this a standard unprivileged-user reach.\nUI:N - The attacker performs every step \u2014 setting the xattrs and issuing the sized `listxattr()` call \u2014 with no action by any other user. The pre-existing NFS mount is an environmental property of the deployment, not an interaction the attacker must induce.\nS:U - The over-read, the leaked data, and the heap overflow all occur within the kernel\u0027s own memory and are delivered to the attacker\u0027s own process. No VM, IOMMU, or other security-authority boundary is crossed.\nC:H - When hardened usercopy is not enforcing, `copy_to_user()` transfers up to XATTR_LIST_MAX (64 KB) of kernel heap memory past a 16-byte kmalloc object directly into the attacker\u0027s buffer, with the over-read length controlled by how many `user.*` xattrs the attacker attaches to the file. This is a large, attacker-sized disclosure of adjacent slab contents including potential pointers and other tasks\u0027 data.\nI:H - The `size_t` underflow hands `nfs4_listxattr_nfs4_user()` a past-the-end pointer with an effectively unbounded length, and `decode_listxattrs()` then memcpy()s `user.\u003cattacker-chosen-name\u003e\\0` records past the end of a kmalloc-16 object in a loop until EOF. This is a heap buffer overflow with attacker-controlled content, length, and destination slab, which is a strong primitive for adjacent-object corruption and control-flow hijacking.\nA:H - The reported and reproducible outcome is `usercopy_abort()` calling `BUG()` at mm/usercopy.c:102 \u2014 a kernel oops that is a full panic on systems with `panic_on_oops` (common on embedded, automotive, and hardened deployments), repeatable at will by any local user. The heap overflow path additionally corrupts slab metadata and adjacent objects, causing further crashes."
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Although the overflow content is supplied by the NFS server over the wire, a local syscall is required to reach the code, so the attack vector is Local.\\nAC:L - Triggering is fully deterministic \\u2014 the attacker probes with `size = 0`, then calls `listxattr()` with a size exactly equal to the generic handler list (16 bytes for `\\\"system.nfs4_acl\\\\0\\\"`), with no race to win and no memory-layout condition outside their control. The required config (CONFIG_NFS_V4_2, CONFIG_NFS_V4_SECURITY_LABEL, CONFIG_HARDENED_USERCOPY) is enabled by default on mainstream distributions, as demonstrated by the reporter reproducing on a stock Fedora 40 kernel.\\nPR:L - Any unprivileged local user with ordinary access to a file on an existing NFSv4.2 mount can call `listxattr()` and set the `user.*` xattrs that become the overflow payload; no capabilities are needed. NFS-mounted home directories on shared/multi-user hosts make this a standard unprivileged-user reach.\\nUI:N - The attacker performs every step \\u2014 setting the xattrs and issuing the sized `listxattr()` call \\u2014 with no action by any other user. The pre-existing NFS mount is an environmental property of the deployment, not an interaction the attacker must induce.\\nS:U - The over-read, the leaked data, and the heap overflow all occur within the kernel\u0027s own memory and are delivered to the attacker\u0027s own process. No VM, IOMMU, or other security-authority boundary is crossed.\\nC:H - When hardened usercopy is not enforcing, `copy_to_user()` transfers up to XATTR_LIST_MAX (64 KB) of kernel heap memory past a 16-byte kmalloc object directly into the attacker\u0027s buffer, with the over-read length controlled by how many `user.*` xattrs the attacker attaches to the file. This is a large, attacker-sized disclosure of adjacent slab contents including potential pointers and other tasks\u0027 data.\\nI:H - The `size_t` underflow hands `nfs4_listxattr_nfs4_user()` a past-the-end pointer with an effectively unbounded length, and `decode_listxattrs()` then memcpy()s `user.\u003cattacker-chosen-name\u003e\\\\0` records past the end of a kmalloc-16 object in a loop until EOF. This is a heap buffer overflow with attacker-controlled content, length, and destination slab, which is a strong primitive for adjacent-object corruption and control-flow hijacking.\\nA:H - The reported and reproducible outcome is `usercopy_abort()` calling `BUG()` at mm/usercopy.c:102 \\u2014 a kernel oops that is a full panic on systems with `panic_on_oops` (common on embedded, automotive, and hardened deployments), repeatable at will by any local user. The heap overflow path additionally corrupts slab metadata and adjacent objects, causing further crashes.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"4403438eaca6e91f02d272211c4d6b045092396b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"9d52865ff28245fc2134da9f99baff603a24407a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"06e828b3f1b206de08ef520fc46a40b22e1869cb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"79cdcc765969d23f4e3d6ea115660c3333498768\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"80365c9f96015bbf048fdd6c8705d3f8770132bf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"23bfecb4d852751d5e403557dd500bb563313baf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"012a211abd5db098094ce429de5f046368391e68\", \"lessThan\": \"251a658bbfceafb4d58c76b77682c8bf7bcfad65\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfs/nfs4proc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.214\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.153\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfs/nfs4proc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396b\"}, {\"url\": \"https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407a\"}, {\"url\": \"https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cb\"}, {\"url\": \"https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768\"}, {\"url\": \"https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bf\"}, {\"url\": \"https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313baf\"}, {\"url\": \"https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\\n\\nA call to listxattr() with a buffer size = 0 returns the actual\\nsize of the buffer needed for a subsequent call. When size \u003e 0,\\nnfs4_listxattr() does not return an error because either\\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\\nexactly all the bytes then size is 0 when calling\\nnfs4_listxattr_nfs4_user() which then triggers the following\\nkernel BUG:\\n\\n  [   99.403778] kernel BUG at mm/usercopy.c:102!\\n  [   99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\\n  [   99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\\n  [   99.415827] Call trace:\\n  [   99.415985]  usercopy_abort+0x70/0xa0\\n  [   99.416227]  __check_heap_object+0x134/0x158\\n  [   99.416505]  check_heap_object+0x150/0x188\\n  [   99.416696]  __check_object_size.part.0+0x78/0x168\\n  [   99.416886]  __check_object_size+0x28/0x40\\n  [   99.417078]  listxattr+0x8c/0x120\\n  [   99.417252]  path_listxattr+0x78/0xe0\\n  [   99.417476]  __arm64_sys_listxattr+0x28/0x40\\n  [   99.417723]  invoke_syscall+0x78/0x100\\n  [   99.417929]  el0_svc_common.constprop.0+0x48/0xf0\\n  [   99.418186]  do_el0_svc+0x24/0x38\\n  [   99.418376]  el0_svc+0x3c/0x110\\n  [   99.418554]  el0t_64_sync_handler+0x120/0x130\\n  [   99.418788]  el0t_64_sync+0x194/0x198\\n  [   99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\\n\\nIssue is reproduced when generic_listxattr() returns \u0027system.nfs4_acl\u0027,\\nthus calling lisxattr() with size = 16 will trigger the bug.\\n\\nAdd check on nfs4_listxattr() to return ERANGE error when it is\\ncalled with size \u003e 0 and the return value is greater than size.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.214\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.153\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.83\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.23\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.11\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.2\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:28:01.958Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26870\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:01.958Z\", \"dateReserved\": \"2024-02-19T14:20:24.184Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:30.756Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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