CVE-2024-36476: RDMA/rtrs: Ensure 'ib_sge list' is accessible
First published: Wed Jan 15 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs: Ensure 'ib_sge list' is accessible Move the declaration of the 'ib_sge list' variable outside the 'always_invalidate' block to ensure it remains accessible for use throughout the function. Previously, 'ib_sge list' was declared within the 'always_invalidate' block, limiting its accessibility, then caused a 'BUG: kernel NULL pointer dereference'[1]. ? __die_body.cold+0x19/0x27 ? page_fault_oops+0x15a/0x2d0 ? search_module_extables+0x19/0x60 ? search_bpf_extables+0x5f/0x80 ? exc_page_fault+0x7e/0x180 ? asm_exc_page_fault+0x26/0x30 ? memcpy_orig+0xd5/0x140 rxe_mr_copy+0x1c3/0x200 [rdma_rxe] ? rxe_pool_get_index+0x4b/0x80 [rdma_rxe] copy_data+0xa5/0x230 [rdma_rxe] rxe_requester+0xd9b/0xf70 [rdma_rxe] ? finish_task_switch.isra.0+0x99/0x2e0 rxe_sender+0x13/0x40 [rdma_rxe] do_task+0x68/0x1e0 [rdma_rxe] process_one_work+0x177/0x330 worker_thread+0x252/0x390 ? __pfx_worker_thread+0x10/0x10 This change ensures the variable is available for subsequent operations that require it. [1] https://lore.kernel.org/linux-rdma/6a1f3e8f-deb0-49f9-bc69-a9b03ecfcda7@fujitsu.com/
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.8<5.10.233 | |
| Linux Kernel | >=5.11<5.15.176 | |
| Linux Kernel | >=5.16<6.1.124 | |
| Linux Kernel | >=6.2<6.6.70 | |
| Linux Kernel | >=6.7<6.12.9 | |
| Linux Kernel | =6.13-rc1 | |
| Linux Kernel | =6.13-rc2 | |
| Linux Kernel | =6.13-rc3 | |
| Linux Kernel | =6.13-rc4 | |
| Linux Kernel | =6.13-rc5 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/7eaa71f56a6f7ab87957213472dc6d4055862722
- https://git.kernel.org/stable/c/143378075904e78b3b2a810099bcc3b3d82d762f
- https://git.kernel.org/stable/c/32e1e748a85bd52b20b3857d80fd166d22fa455a
- https://git.kernel.org/stable/c/b238f61cc394d5fef27b26d7d9aa383ebfddabb0
- https://git.kernel.org/stable/c/6ffb5c1885195ae5211a12b4acd2d51843ca41b0
- https://git.kernel.org/stable/c/fb514b31395946022f13a08e06a435f53cf9e8b3
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36476
- https://nvd.nist.gov/vuln/detail/CVE-2024-36476
- https://launchpad.net/bugs/cve/CVE-2024-36476
- https://security-tracker.debian.org/tracker/CVE-2024-36476
- https://ubuntu.com/security/CVE-2024-36476
- https://git.kernel.org/linus/fb514b31395946022f13a08e06a435f53cf9e8b3
Frequently Asked Questions
What is the severity of CVE-2024-36476?
CVE-2024-36476 has a severity rating that indicates it impacts the accessibility of the 'ib_sge list' variable within the Linux kernel.
How do I fix CVE-2024-36476?
To fix CVE-2024-36476, ensure that the 'ib_sge list' variable is declared outside the 'always_invalidate' block in the affected functions.
Which versions of Linux kernel are affected by CVE-2024-36476?
CVE-2024-36476 affects multiple versions of the Linux kernel ranging from 5.8 to 6.13-rc5.
What components are impacted by CVE-2024-36476?
CVE-2024-36476 impacts the RDMA/rtrs component of the Linux kernel.
Is there a workaround for CVE-2024-36476?
Currently, there is no documented workaround for CVE-2024-36476 other than applying the necessary code changes.
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