CVE-2024-26638: nbd: always initialize struct msghdr completely
First published: Mon Mar 18 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nbd: always initialize struct msghdr completely syzbot complains that msg->msg_get_inq value can be uninitialized [1] struct msghdr got many new fields recently, we should always make sure their values is zero by default. [1] BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571 inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879 sock_recvmsg_nosec net/socket.c:1044 [inline] sock_recvmsg+0x12b/0x1e0 net/socket.c:1066 __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538 nbd_read_reply drivers/block/nbd.c:732 [inline] recv_work+0x262/0x3100 drivers/block/nbd.c:863 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Local variable msg created at: __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513 nbd_read_reply drivers/block/nbd.c:732 [inline] recv_work+0x262/0x3100 drivers/block/nbd.c:863 CPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: nbd5-recv recv_work
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.76 | 6.1.76 |
| redhat/kernel | <6.6.15 | 6.6.15 |
| redhat/kernel | <6.7.3 | 6.7.3 |
| redhat/kernel | <6.8 | 6.8 |
| Linux Kernel | >=5.19<6.1.76 | |
| Linux Kernel | >=6.2<6.6.15 | |
| Linux Kernel | >=6.7<6.7.3 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://git.kernel.org/stable/c/1960f2b534da1e6c65fb96f9e98bda773495f406
- https://git.kernel.org/stable/c/78fbb92af27d0982634116c7a31065f24d092826
- https://git.kernel.org/stable/c/b0028f333420a65a53a63978522db680b37379dd
- https://git.kernel.org/stable/c/d9c54763e5cdbbd3f81868597fe8aca3c96e6387
- https://launchpad.net/bugs/cve/CVE-2024-26638
- https://access.redhat.com/security/cve/CVE-2024-26638
- https://lore.kernel.org/linux-cve-announce/20240318101458.2835626-16-lee@kernel.org/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2270104
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2270103
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26638
- https://nvd.nist.gov/vuln/detail/CVE-2024-26638
- https://security-tracker.debian.org/tracker/CVE-2024-26638
- https://ubuntu.com/security/CVE-2024-26638
- https://git.kernel.org/linus/78fbb92af27d0982634116c7a31065f24d092826
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-26638?
CVE-2024-26638 has been classified as a moderate severity vulnerability due to uninitialized values in the Linux kernel's struct msghdr.
How do I fix CVE-2024-26638?
To fix CVE-2024-26638, update your system to the recommended kernel versions 6.1.76, 6.6.15, 6.7.3, 6.8, or applicable versions from Debian such as 5.10.223-1 or 6.12.12-1.
What software is affected by CVE-2024-26638?
CVE-2024-26638 affects various versions of the Linux kernel on Red Hat and Debian distributions.
What is the nature of CVE-2024-26638 vulnerability?
CVE-2024-26638 is caused by the lack of initialization for the msg->msg_get_inq value in the Linux kernel, which can lead to undefined behavior.
Is CVE-2024-26638 applicable to older kernel versions?
Yes, CVE-2024-26638 can affect older kernel versions prior to the updates that address the uninitialized struct msghdr issue.
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