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Vulnerability details: VCID-k9hv-ejph-8uaz
Vulnerability ID VCID-k9hv-ejph-8uaz
Aliases CVE-2024-44951
Summary In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.
Status Published
Exploitability 0.5
Weighted Severity 4.6
Risk 2.3
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-667 Improper Locking
System Score Found at
cvssv3 5.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-44951.json
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2024-44951
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2024-44951
cvssv3.1 5.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
ssvc Track https://git.kernel.org/stable/c/09cfe05e9907f3276887a20e267cc40e202f4fdd
ssvc Track https://git.kernel.org/stable/c/133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-44951.json
https://api.first.org/data/v1/epss?cve=CVE-2024-44951
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
09cfe05e9907f3276887a20e267cc40e202f4fdd https://git.kernel.org/stable/c/09cfe05e9907f3276887a20e267cc40e202f4fdd
133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4 https://git.kernel.org/stable/c/133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4
2309782 https://bugzilla.redhat.com/show_bug.cgi?id=2309782
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2024-44951.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-10T17:40:19Z/ Found at https://git.kernel.org/stable/c/09cfe05e9907f3276887a20e267cc40e202f4fdd
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-10T17:40:19Z/ Found at https://git.kernel.org/stable/c/133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4
Exploit Prediction Scoring System (EPSS)
Percentile 0.04761
EPSS Score 0.00018
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:51:24.090434+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0