{"id":"CVE-2024-26638","state":"PUBLISHED","title":"nbd: always initialize struct msghdr completely","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: always initialize struct msghdr completely\n\nsyzbot complains that msg->msg_get_inq value can be uninitialized [1]\n\nstruct msghdr got many new fields recently, we should always make\nsure their values is zero by default.\n\n[1]\n BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571\n  tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571\n  inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879\n  sock_recvmsg_nosec net/socket.c:1044 [inline]\n  sock_recvmsg+0x12b/0x1e0 net/socket.c:1066\n  __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\n  process_one_work kernel/workqueue.c:2627 [inline]\n  process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700\n  worker_thread+0xf45/0x1490 kernel/workqueue.c:2781\n  kthread+0x3ed/0x540 kernel/kthread.c:388\n  ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147\n  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242\n\nLocal variable msg created at:\n  __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\n\nCPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\nWorkqueue: nbd5-recv recv_work","publishedAt":"2024-03-18T10:14:48.970Z","updatedAt":"2026-05-11T20:01:17.550Z","severity":{"score":4.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"d9c54763e5cdbbd3f81868597fe8aca3c96e6387","versionType":"git"},{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"1960f2b534da1e6c65fb96f9e98bda773495f406","versionType":"git"},{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"b0028f333420a65a53a63978522db680b37379dd","versionType":"git"},{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"78fbb92af27d0982634116c7a31065f24d092826","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.76","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.15","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.3","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]}],"references":["https://git.kernel.org/stable/c/d9c54763e5cdbbd3f81868597fe8aca3c96e6387","https://git.kernel.org/stable/c/1960f2b534da1e6c65fb96f9e98bda773495f406","https://git.kernel.org/stable/c/b0028f333420a65a53a63978522db680b37379dd","https://git.kernel.org/stable/c/78fbb92af27d0982634116c7a31065f24d092826"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/26xxx/CVE-2024-26638.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26638","state":"PUBLISHED","datePublished":"2024-03-18T10:14:48.970Z","dateUpdated":"2026-05-11T20:01:17.550Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.137Z"},"containers":{"cna":{"title":"nbd: always initialize struct msghdr completely","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: always initialize struct msghdr completely\n\nsyzbot complains that msg->msg_get_inq value can be uninitialized [1]\n\nstruct msghdr got many new fields recently, we should always make\nsure their values is zero by default.\n\n[1]\n BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571\n  tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571\n  inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879\n  sock_recvmsg_nosec net/socket.c:1044 [inline]\n  sock_recvmsg+0x12b/0x1e0 net/socket.c:1066\n  __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\n  process_one_work kernel/workqueue.c:2627 [inline]\n  process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700\n  worker_thread+0xf45/0x1490 kernel/workqueue.c:2781\n  kthread+0x3ed/0x540 kernel/kthread.c:388\n  ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147\n  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242\n\nLocal variable msg created at:\n  __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\n\nCPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\nWorkqueue: nbd5-recv recv_work"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"d9c54763e5cdbbd3f81868597fe8aca3c96e6387","versionType":"git"},{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"1960f2b534da1e6c65fb96f9e98bda773495f406","versionType":"git"},{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"b0028f333420a65a53a63978522db680b37379dd","versionType":"git"},{"version":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60","status":"affected","lessThan":"78fbb92af27d0982634116c7a31065f24d092826","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.76","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.15","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.3","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d9c54763e5cdbbd3f81868597fe8aca3c96e6387"},{"url":"https://git.kernel.org/stable/c/1960f2b534da1e6c65fb96f9e98bda773495f406"},{"url":"https://git.kernel.org/stable/c/b0028f333420a65a53a63978522db680b37379dd"},{"url":"https://git.kernel.org/stable/c/78fbb92af27d0982634116c7a31065f24d092826"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:01:17.550Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.76"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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