CVE-2024-21803 | Possible UAF in bt_accept_poll in Linux kernel

Use After Free vulnerability in Linux Linux kernel kernel on Linux, x86, ARM (bluetooth modules) allows Local Execution of Code. This vulnerability is associated with program files https://gitee.Com/anolis/cloud-kernel/blob/devel-5.10/net/bluetooth/af_bluetooth.C. This issue affects Linux kernel: from v2.6.12-rc2 before v6.8-rc1.

Published: 2024-01-30 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-21803 is rated Low Risk (27.9/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.50%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-21803

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.04% 0.50% +0.46%
2 2025-11-21 0.57% 0.04% -0.54%
3 2025-11-18 — 0.57% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-21803

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.5 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.8 1.4 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]

Weakness enumeration for CVE-2024-21803

OS Trackers for CVE-2024-21803

vendor priority summary link
debian not yet assigned CVE-2024-21803 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2024-21803
redhat medium — https://access.redhat.com/security/cve/CVE-2024-21803
suse medium — https://www.suse.com/security/cve/CVE-2024-21803/
ubuntu medium CVE-2024-21803 medium priority: Ubuntu including 120 source packages (linux, linux-allwinner-5.19, …), 960 status rows across 8 suites (bionic, focal, jammy, mantic, noble, trusty, upstream, xenial): DNE 657, not-affected 154, ignored 149. https://ubuntu.com/security/CVE-2024-21803

Affected software / configurations for CVE-2024-21803

Vendor Product Version Raw CPE
linux linux_kernel >= 2.6.12.1, <= 6.6.8 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel 2.6.12 cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*
linux linux_kernel 2.6.12 cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*
linux linux_kernel 2.6.12 cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*
linux linux_kernel 2.6.12 cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*
linux linux_kernel 2.6.12 cpe:2.3:o:linux:linux_kernel:2.6.12:rc6:*:*:*:*:*:*
linux linux_kernel 6.7 cpe:2.3:o:linux:linux_kernel:6.7:rc1:*:*:*:*:*:*
linux linux_kernel 6.7 cpe:2.3:o:linux:linux_kernel:6.7:rc2:*:*:*:*:*:*
linux linux_kernel 6.7 cpe:2.3:o:linux:linux_kernel:6.7:rc3:*:*:*:*:*:*
linux linux_kernel 6.7 cpe:2.3:o:linux:linux_kernel:6.7:rc4:*:*:*:*:*:*
linux linux_kernel 6.7 cpe:2.3:o:linux:linux_kernel:6.7:rc5:*:*:*:*:*:*
linux linux_kernel 6.7 cpe:2.3:o:linux:linux_kernel:6.7:rc6:*:*:*:*:*:*

References for CVE-2024-21803

URL Tags
https://bugzilla.openanolis.cn/show_bug.cgi?id=8081 Issue Tracking Permissions Required
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