fkie_cve-2025-38718
Vulnerability from fkie_nvd
Published
2025-09-04 16:15
Modified
2025-09-05 17:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: linearize cloned gso packets in sctp_rcv A cloned head skb still shares these frag skbs in fraglist with the original head skb. It's not safe to access these frag skbs. syzbot reported two use-of-uninitialized-memory bugs caused by this: BUG: KMSAN: uninit-value in sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360 sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885 sctp_sendmsg+0x32b9/0x4a80 net/sctp/socket.c:2031 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:718 [inline] and BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9367 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] This patch fixes it by linearizing cloned gso packets in sctp_rcv().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03d0cc6889e02420125510b5444b570f4bbf53d5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1bd5214ea681584c5886fea3ba03e49f93a43c0e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d757f17bc2ef2727994ffa6d5d6e4bc4789a770
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd0e92bb2b7542fb96397ffac639b4f5b099d0cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0194e391bb493aa6cec56d177b14df6b29188d5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea094f38d387d1b0ded5dee4a3e5720aa4ce0139
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc66772607101bd2030a4332b3bd0ea3b3605250
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd60d8a086191fe33c2d719732d2482052fa6805
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: linearize cloned gso packets in sctp_rcv\n\nA cloned head skb still shares these frag skbs in fraglist with the\noriginal head skb. It\u0027s not safe to access these frag skbs.\n\nsyzbot reported two use-of-uninitialized-memory bugs caused by this:\n\n  BUG: KMSAN: uninit-value in sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211\n   sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211\n   sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998\n   sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88\n   sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331\n   sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122\n   __release_sock+0x1da/0x330 net/core/sock.c:3106\n   release_sock+0x6b/0x250 net/core/sock.c:3660\n   sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360\n   sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885\n   sctp_sendmsg+0x32b9/0x4a80 net/sctp/socket.c:2031\n   inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851\n   sock_sendmsg_nosec net/socket.c:718 [inline]\n\nand\n\n  BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987\n   sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987\n   sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88\n   sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331\n   sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148\n   __release_sock+0x1d3/0x330 net/core/sock.c:3213\n   release_sock+0x6b/0x270 net/core/sock.c:3767\n   sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9367\n   sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886\n   sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032\n   inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851\n   sock_sendmsg_nosec net/socket.c:712 [inline]\n\nThis patch fixes it by linearizing cloned gso packets in sctp_rcv()."
    }
  ],
  "id": "CVE-2025-38718",
  "lastModified": "2025-09-05T17:47:24.833",
  "metrics": {},
  "published": "2025-09-04T16:15:41.413",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/03d0cc6889e02420125510b5444b570f4bbf53d5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1bd5214ea681584c5886fea3ba03e49f93a43c0e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7d757f17bc2ef2727994ffa6d5d6e4bc4789a770"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cd0e92bb2b7542fb96397ffac639b4f5b099d0cb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0194e391bb493aa6cec56d177b14df6b29188d5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea094f38d387d1b0ded5dee4a3e5720aa4ce0139"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc66772607101bd2030a4332b3bd0ea3b3605250"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fd60d8a086191fe33c2d719732d2482052fa6805"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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