# CVE-2022-48811: linux: In the Linux kernel, the following vulnerability has been resolved:  ibmvnic: don't release napi in __ibmvnic_open()...

CVE-2022-48811 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48811, released July 16, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48811
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  ibmvnic: don't release napi in __ibmvnic_open()  If __ibmvnic_open() encounters an error such as when setting link state, it calls release_resources() which frees the napi structures needlessly. Instead, have __ibmvnic_open() only clean up the work it did so far (i.e. disable napi and irqs) and leave the rest to the callers.  If caller of __ibmvnic_open() is ibmvnic_open(), it should release the resources immediately. If the caller is do_reset() or do_hard_reset(), they will release the resources on the next reset.  This fixes following crash that occurred when running the drmgr command several times to add/remove a vnic interface:  	[102056] ibmvnic 30000003 env3: Disabling rx_scrq[6] irq 	[102056] ibmvnic 30000003 env3: Disabling rx_scrq[7] irq 	[102056] ibmvnic 30000003 env3: Replenished 8 pools 	Kernel attempted to read user page (10) - exploit attempt? (uid: 0) 	BUG: Kernel NULL pointer dereference on read at 0x00000010 	Faulting instruction address: 0xc000000000a3c840 	Oops: Kernel access of bad area, sig: 11 [#1] 	LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries 	... 	CPU: 9 PID: 102056 Comm: kworker/9:2 Kdump: loaded Not tainted 5.16.0-rc5-autotest-g6441998e2e37 #1 	Workqueue: events_long __ibmvnic_reset [ibmvnic] 	NIP:  c000000000a3c840 LR: c0080000029b5378 CTR: c000000000a3c820 	REGS: c0000000548e37e0 TRAP: 0300   Not tainted  (5.16.0-rc5-autotest-g6441998e2e37) 	MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 28248484  XER: 00000004 	CFAR: c0080000029bdd24 DAR: 0000000000000010 DSISR: 40000000 IRQMASK: 0 	GPR00: c0080000029b55d0 c0000000548e3a80 c0000000028f0200 0000000000000000 	... 	NIP [c000000000a3c840] napi_enable+0x20/0xc0 	LR [c0080000029b5378] __ibmvnic_open+0xf0/0x430 [ibmvnic] 	Call Trace: 	[c0000000548e3a80] [0000000000000006] 0x6 (unreliable) 	[c0000000548e3ab0] [c0080000029b55d0] __ibmvnic_open+0x348/0x430 [ibmvnic] 	[c0000000548e3b40] [c0080000029bcc28] __ibmvnic_reset+0x500/0xdf0 [ibmvnic] 	[c0000000548e3c60] [c000000000176228] process_one_work+0x288/0x570 	[c0000000548e3d00] [c000000000176588] worker_thread+0x78/0x660 	[c0000000548e3da0] [c0000000001822f0] kthread+0x1c0/0x1d0 	[c0000000548e3e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64 	Instruction dump: 	7d2948f8 792307e0 4e800020 60000000 3c4c01eb 384239e0 f821ffd1 39430010 	38a0fff6 e92d1100 f9210028 39200000 <e9030010> f9010020 60420000 e9210020 	---[ end trace 5f8033b08fd27706 ]---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.10-1 | [DEBIAN-CVE-2022-48811](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48811.md) | Jul 16, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.10-1 | [DEBIAN-CVE-2022-48811](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48811.md) | Jul 16, 2024 |
| Linux | linux Debian 14 | 5.16.10-1 | [DEBIAN-CVE-2022-48811](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48811.md) | Jul 16, 2024 |

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