---
cve: "CVE-2024-26893"
severity: "LOW"
cvss: 3.1
epss: "23%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-04-17 11:15:10"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T15:24:01+02:00"
---

# CVE-2024-26893

> 3.1 LOW

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

firmware: arm_scmi: Fix double free in SMC transport cleanup path

When the generic SCMI code tears down a channel, it calls the chan_free
callback function, defined by each transport. Since multiple protocols
might share the same transport_info member, chan_free() might want to
clean up the same member multiple times within the given SCMI transport
implementation. In this case, it is SMC transport. This will lead to a NULL
pointer dereference at the second time:

    | scmi_protocol scmi_dev.1: Enabled polling mode TX channel - prot_id:16
    | arm-scmi firmware:scmi: SCMI Notifications - Core Enabled.
    | arm-scmi firmware:scmi: unable to communicate with SCMI
    | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
    | Mem abort info:
    |   ESR = 0x0000000096000004
    |   EC = 0x25: DABT (current EL), IL = 32 bits
    |   SET = 0, FnV = 0
    |   EA = 0, S1PTW = 0
    |   FSC = 0x04: level 0 translation fault
    | Data abort info:
    |   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
    |   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
    |   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
    | user pgtable: 4k pages, 48-bit VAs, pgdp=0000000881ef8000
    | [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
    | Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
    | Modules linked in:
    | CPU: 4 PID: 1 Comm: swapper/0 Not tainted 6.7.0-rc2-00124-g455ef3d016c9-dirty #793
    | Hardware name: FVP Base RevC (DT)
    | pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
    | pc : smc_chan_free+0x3c/0x6c
    | lr : smc_chan_free+0x3c/0x6c
    | Call trace:
    |  smc_chan_free+0x3c/0x6c
    |  idr_for_each+0x68/0xf8
    |  scmi_cleanup_channels.isra.0+0x2c/0x58
    |  scmi_probe+0x434/0x734
    |  platform_probe+0x68/0xd8
    |  really_probe+0x110/0x27c
    |  __driver_probe_device+0x78/0x12c
    |  driver_probe_device+0x3c/0x118
    |  __driver_attach+0x74/0x128
    |  bus_for_each_dev+0x78/0xe0
    |  driver_attach+0x24/0x30
    |  bus_add_driver+0xe4/0x1e8
    |  driver_register+0x60/0x128
    |  __platform_driver_register+0x28/0x34
    |  scmi_driver_init+0x84/0xc0
    |  do_one_initcall+0x78/0x33c
    |  kernel_init_freeable+0x2b8/0x51c
    |  kernel_init+0x24/0x130
    |  ret_from_fork+0x10/0x20
    | Code: f0004701 910a0021 aa1403e5 97b91c70 (b9400280)
    | ---[ end trace 0000000000000000 ]---

Simply check for the struct pointer being NULL before trying to access
its members, to avoid this situation.

This was found when a transport doesn't really work (for instance no SMC
service), the probe routines then tries to clean up, and triggers a crash.

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.83
- Kernel ≥ 6.6.23
- Kernel ≥ 6.7.11
- Kernel ≥ 6.8.2

## Referenzen

- <https://git.kernel.org/stable/c/0d276d9f335f41d6524258d58c0c0241ef9a83a4>
- <https://git.kernel.org/stable/c/857f56db8c3a71f9871922b6984ff74ad588cb2c>
- <https://git.kernel.org/stable/c/8ffaa17ccb1eb1b65cf85db63225a3581c303773>
- <https://git.kernel.org/stable/c/ead445dd3d681020af333649a27306160eee761d>
- <https://git.kernel.org/stable/c/f1d71576d2c9ec8fdb822173fa7f3de79475e9bd>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-26893) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_