cve-2024-26805
Vulnerability from cvelistv5
Published
2024-04-04 08:20
Modified
2024-08-02 00:14
Severity
Summary
netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b27bf4c494d61e5663baa34c3edd7ccebf0ea44
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/59fc3e3d049e39e7d0d271f20dd5fb47c57faf1d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/661779e1fcafe1b74b3f3fe8e980c1e207fea1fd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ae51361da43270f4ba0eb924427a07e87e48777
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c71ed29d15b1a1ed6c464f8c3536996963046285
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3ada42e534a83b618bbc1e490d23bf0fdae4736
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec343a55b687a452f5e87f3b52bf9f155864df65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f19d1f98e60e68b11fc60839105dd02a30ec0d77
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: Fix kernel-infoleak-after-free in __skb_datagram_iter\n\nsyzbot reported the following uninit-value access issue [1]:\n\nnetlink_to_full_skb() creates a new `skb` and puts the `skb-\u003edata`\npassed as a 1st arg of netlink_to_full_skb() onto new `skb`. The data\nsize is specified as `len` and passed to skb_put_data(). This `len`\nis based on `skb-\u003eend` that is not data offset but buffer offset. The\n`skb-\u003eend` contains data and tailroom. Since the tailroom is not\ninitialized when the new `skb` created, KMSAN detects uninitialized\nmemory area when copying the data.\n\nThis patch resolved this issue by correct the len from `skb-\u003eend` to\n`skb-\u003elen`, which is the actual data offset.\n\nBUG: KMSAN: kernel-infoleak-after-free in instrument_copy_to_user include/linux/instrumented.h:114 [inline]\nBUG: KMSAN: kernel-infoleak-after-free in copy_to_user_iter lib/iov_iter.c:24 [inline]\nBUG: KMSAN: kernel-infoleak-after-free in iterate_ubuf include/linux/iov_iter.h:29 [inline]\nBUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance2 include/linux/iov_iter.h:245 [inline]\nBUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance include/linux/iov_iter.h:271 [inline]\nBUG: KMSAN: kernel-infoleak-after-free in _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186\n instrument_copy_to_user include/linux/instrumented.h:114 [inline]\n copy_to_user_iter lib/iov_iter.c:24 [inline]\n iterate_ubuf include/linux/iov_iter.h:29 [inline]\n iterate_and_advance2 include/linux/iov_iter.h:245 [inline]\n iterate_and_advance include/linux/iov_iter.h:271 [inline]\n _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186\n copy_to_iter include/linux/uio.h:197 [inline]\n simple_copy_to_iter+0x68/0xa0 net/core/datagram.c:532\n __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:420\n skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546\n skb_copy_datagram_msg include/linux/skbuff.h:3960 [inline]\n packet_recvmsg+0xd9c/0x2000 net/packet/af_packet.c:3482\n sock_recvmsg_nosec net/socket.c:1044 [inline]\n sock_recvmsg net/socket.c:1066 [inline]\n sock_read_iter+0x467/0x580 net/socket.c:1136\n call_read_iter include/linux/fs.h:2014 [inline]\n new_sync_read fs/read_write.c:389 [inline]\n vfs_read+0x8f6/0xe00 fs/read_write.c:470\n ksys_read+0x20f/0x4c0 fs/read_write.c:613\n __do_sys_read fs/read_write.c:623 [inline]\n __se_sys_read fs/read_write.c:621 [inline]\n __x64_sys_read+0x93/0xd0 fs/read_write.c:621\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was stored to memory at:\n skb_put_data include/linux/skbuff.h:2622 [inline]\n netlink_to_full_skb net/netlink/af_netlink.c:181 [inline]\n __netlink_deliver_tap_skb net/netlink/af_netlink.c:298 [inline]\n __netlink_deliver_tap+0x5be/0xc90 net/netlink/af_netlink.c:325\n netlink_deliver_tap net/netlink/af_netlink.c:338 [inline]\n netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n netlink_unicast+0x10f1/0x1250 net/netlink/af_netlink.c:1368\n netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584\n ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638\n __sys_sendmsg net/socket.c:2667 [inline]\n __do_sys_sendmsg net/socket.c:2676 [inline]\n __se_sys_sendmsg net/socket.c:2674 [inline]\n __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\n free_pages_prepare mm/page_alloc.c:1087 [inline]\n free_unref_page_prepare+0xb0/0xa40 mm/page_alloc.c:2347\n free_unref_page_list+0xeb/0x1100 mm/page_alloc.c:2533\n release_pages+0x23d3/0x2410 mm/swap.c:1042\n free_pages_and_swap_cache+0xd9/0xf0 mm/swap_state.c:316\n tlb_batch_pages\n---truncated---"
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      "title": "netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26805",
    "datePublished": "2024-04-04T08:20:32.250Z",
    "dateReserved": "2024-02-19T14:20:24.179Z",
    "dateUpdated": "2024-08-02T00:14:13.525Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26805\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-04T09:15:09.277\",\"lastModified\":\"2024-06-27T12:15:20.960\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetlink: Fix kernel-infoleak-after-free in __skb_datagram_iter\\n\\nsyzbot reported the following uninit-value access issue [1]:\\n\\nnetlink_to_full_skb() creates a new `skb` and puts the `skb-\u003edata`\\npassed as a 1st arg of netlink_to_full_skb() onto new `skb`. The data\\nsize is specified as `len` and passed to skb_put_data(). This `len`\\nis based on `skb-\u003eend` that is not data offset but buffer offset. The\\n`skb-\u003eend` contains data and tailroom. Since the tailroom is not\\ninitialized when the new `skb` created, KMSAN detects uninitialized\\nmemory area when copying the data.\\n\\nThis patch resolved this issue by correct the len from `skb-\u003eend` to\\n`skb-\u003elen`, which is the actual data offset.\\n\\nBUG: KMSAN: kernel-infoleak-after-free in instrument_copy_to_user include/linux/instrumented.h:114 [inline]\\nBUG: KMSAN: kernel-infoleak-after-free in copy_to_user_iter lib/iov_iter.c:24 [inline]\\nBUG: KMSAN: kernel-infoleak-after-free in iterate_ubuf include/linux/iov_iter.h:29 [inline]\\nBUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance2 include/linux/iov_iter.h:245 [inline]\\nBUG: KMSAN: kernel-infoleak-after-free in iterate_and_advance include/linux/iov_iter.h:271 [inline]\\nBUG: KMSAN: kernel-infoleak-after-free in _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186\\n instrument_copy_to_user include/linux/instrumented.h:114 [inline]\\n copy_to_user_iter lib/iov_iter.c:24 [inline]\\n iterate_ubuf include/linux/iov_iter.h:29 [inline]\\n iterate_and_advance2 include/linux/iov_iter.h:245 [inline]\\n iterate_and_advance include/linux/iov_iter.h:271 [inline]\\n _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186\\n copy_to_iter include/linux/uio.h:197 [inline]\\n simple_copy_to_iter+0x68/0xa0 net/core/datagram.c:532\\n __skb_datagram_iter+0x123/0xdc0 net/core/datagram.c:420\\n skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546\\n skb_copy_datagram_msg include/linux/skbuff.h:3960 [inline]\\n packet_recvmsg+0xd9c/0x2000 net/packet/af_packet.c:3482\\n sock_recvmsg_nosec net/socket.c:1044 [inline]\\n sock_recvmsg net/socket.c:1066 [inline]\\n sock_read_iter+0x467/0x580 net/socket.c:1136\\n call_read_iter include/linux/fs.h:2014 [inline]\\n new_sync_read fs/read_write.c:389 [inline]\\n vfs_read+0x8f6/0xe00 fs/read_write.c:470\\n ksys_read+0x20f/0x4c0 fs/read_write.c:613\\n __do_sys_read fs/read_write.c:623 [inline]\\n __se_sys_read fs/read_write.c:621 [inline]\\n __x64_sys_read+0x93/0xd0 fs/read_write.c:621\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nUninit was stored to memory at:\\n skb_put_data include/linux/skbuff.h:2622 [inline]\\n netlink_to_full_skb net/netlink/af_netlink.c:181 [inline]\\n __netlink_deliver_tap_skb net/netlink/af_netlink.c:298 [inline]\\n __netlink_deliver_tap+0x5be/0xc90 net/netlink/af_netlink.c:325\\n netlink_deliver_tap net/netlink/af_netlink.c:338 [inline]\\n netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]\\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\\n netlink_unicast+0x10f1/0x1250 net/netlink/af_netlink.c:1368\\n netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910\\n sock_sendmsg_nosec net/socket.c:730 [inline]\\n __sock_sendmsg net/socket.c:745 [inline]\\n ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584\\n ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638\\n __sys_sendmsg net/socket.c:2667 [inline]\\n __do_sys_sendmsg net/socket.c:2676 [inline]\\n __se_sys_sendmsg net/socket.c:2674 [inline]\\n __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nUninit was created at:\\n free_pages_prepare mm/page_alloc.c:1087 [inline]\\n free_unref_page_prepare+0xb0/0xa40 mm/page_alloc.c:2347\\n free_unref_page_list+0xeb/0x1100 mm/page_alloc.c:2533\\n release_pages+0x23d3/0x2410 mm/swap.c:1042\\n free_pages_and_swap_cache+0xd9/0xf0 mm/swap_state.c:316\\n tlb_batch_pages\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: netlink: Fix kernel-infoleak-after-free en __skb_datagram_iter syzbot inform\u00f3 el siguiente problema de acceso al valor uninit [1]: netlink_to_full_skb() crea un nuevo `skb` y coloca el ` skb-\u0026gt;data` pas\u00f3 como primer argumento de netlink_to_full_skb() al nuevo `skb`. El tama\u00f1o de los datos se especifica como `len` y se pasa a skb_put_data(). Este `len` se basa en `skb-\u0026gt;end` que no es un desplazamiento de datos sino un desplazamiento del b\u00fafer. El `skb-\u0026gt;end` contiene datos y espacio de adaptaci\u00f3n. Dado que el tailroom no se inicializa cuando se crea el nuevo `skb`, KMSAN detecta un \u00e1rea de memoria no inicializada al copiar los datos. Este parche resolvi\u00f3 este problema corrigiendo la longitud de `skb-\u0026gt;end` a `skb-\u0026gt;len`, que es el desplazamiento de datos real. ERROR: KMSAN: kernel-infoleak-after-free en instrument_copy_to_user include/linux/instrumented.h:114 [en l\u00ednea] ERROR: KMSAN: kernel-infoleak-after-free en copy_to_user_iter lib/iov_iter.c:24 [en l\u00ednea] ERROR: KMSAN: kernel-infoleak-after-free en iterate_ubuf include/linux/iov_iter.h:29 [en l\u00ednea] ERROR: KMSAN: kernel-infoleak-after-free en iterate_and_advance2 include/linux/iov_iter.h:245 [en l\u00ednea] ERROR: KMSAN: kernel-infoleak-after-free en iterate_and_advance include/linux/iov_iter.h:271 [en l\u00ednea] ERROR: KMSAN: kernel-infoleak-after-free en _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 instrument_copy_to_user include/ linux/instrumented.h:114 [en l\u00ednea] copy_to_user_iter lib/iov_iter.c:24 [en l\u00ednea] iterate_ubuf include/linux/iov_iter.h:29 [en l\u00ednea] iterate_and_advance2 include/linux/iov_iter.h:245 [en l\u00ednea] iterate_and_advance include/ linux/iov_iter.h:271 [en l\u00ednea] _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 copy_to_iter include/linux/uio.h:197 [en l\u00ednea] simple_copy_to_iter+0x68/0xa0 net/core/datagram.c:532 __skb_datagram_iter +0x123/0xdc0 net/core/datagram.c:420 skb_copy_datagram_iter+0x5c/0x200 net/core/datagram.c:546 skb_copy_datagram_msg include/linux/skbuff.h:3960 [en l\u00ednea] paquete_recvmsg+0xd9c/0x2000 net/packet/af_packet .c:3482 sock_recvmsg_nosec net/socket.c:1044 [en l\u00ednea] sock_recvmsg net/socket.c:1066 [en l\u00ednea] sock_read_iter+0x467/0x580 net/socket.c:1136 call_read_iter include/linux/fs.h:2014 [en l\u00ednea ] new_sync_read fs/read_write.c:389 [en l\u00ednea] vfs_read+0x8f6/0xe00 fs/read_write.c:470 ksys_read+0x20f/0x4c0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [en l\u00ednea] __se_sys_read fs/ read_write.c:621 [en l\u00ednea] __x64_sys_read+0x93/0xd0 fs/read_write.c:621 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0x44/0x110 arch/x86/entry/common.c: 83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit se almacen\u00f3 en la memoria en: skb_put_data include/linux/skbuff.h:2622 [en l\u00ednea] netlink_to_full_skb net/netlink/af_netlink.c:181 [en l\u00ednea] __netlink_deliver_tap_skb net/netlink/af_netlink.c:298 [ en l\u00ednea] __netlink_deliver_tap+0x5be/0xc90 net/netlink/af_netlink.c:325 netlink_deliver_tap net/netlink/af_netlink.c:338 [en l\u00ednea] netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [en l\u00ednea] netlink_unicast_kernel net/netlink/af_netlink.c :1341 [en l\u00ednea] netlink_unicast+0x10f1/0x1250 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [en l\u00ednea] __sock_sendmsg net/socket.c :745 [en l\u00ednea] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2584 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638 __sys_sendmsg net/socket.c:2667 [en l\u00ednea] __do_sys_sendmsg net/socket.c:267 6 [en l\u00ednea ] __se_sys_sendmsg net/socket.c:2674 [en l\u00ednea] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2674 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0x44/0x110 arch/x86/ entrada/ common.c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit se cre\u00f3 en: free_pages_prepare mm/page_alloc.c:1087 [en l\u00ednea] free_unref_page_prepare+0xb0/0xa40 mm/page_alloc.c:2347 ---truncado---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b27bf4c494d61e5663baa34c3edd7ccebf0ea44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/59fc3e3d049e39e7d0d271f20dd5fb47c57faf1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/661779e1fcafe1b74b3f3fe8e980c1e207fea1fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ae51361da43270f4ba0eb924427a07e87e48777\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c71ed29d15b1a1ed6c464f8c3536996963046285\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3ada42e534a83b618bbc1e490d23bf0fdae4736\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec343a55b687a452f5e87f3b52bf9f155864df65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f19d1f98e60e68b11fc60839105dd02a30ec0d77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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