UBUNTU-CVE-2023-52621

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    UBUNTU-CVE-2023-52621

    Published: 26 Mar 2024Last Modified: 8 Oct 2026
    Upstream:
    CVE-2023-52621
    Aliases:
    USN-6818-1
    USN-6818-2
    USN-6818-3

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: bpf: Check rcu_read_lock_trace_held() before calling bpf map helpers These three bpf_map_{lookup,update,delete}_elem() helpers are also available for sleepable bpf program, so add the corresponding lock assertion for sleepable bpf program, otherwise the following warning will be reported when a sleepable bpf program manipulates bpf map under interpreter mode (aka bpf_jit_enable=0): WARNING: CPU: 3 PID: 4985 at kernel/bpf/helpers.c:40 ...... CPU: 3 PID: 4985 Comm: test_progs Not tainted 6.6.0+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ...... RIP: 0010:bpf_map_lookup_elem+0x54/0x60 ...... Call Trace: <TASK> ? __warn+0xa5/0x240 ? bpf_map_lookup_elem+0x54/0x60 ? report_bug+0x1ba/0x1f0 ? handle_bug+0x40/0x80 ? exc_invalid_op+0x18/0x50 ? asm_exc_invalid_op+0x1b/0x20 ? __pfx_bpf_map_lookup_elem+0x10/0x10 ? rcu_lockdep_current_cpu_online+0x65/0xb0 ? rcu_is_watching+0x23/0x50 ? bpf_map_lookup_elem+0x54/0x60 ? __pfx_bpf_map_lookup_elem+0x10/0x10 ___bpf_prog_run+0x513/0x3b70 __bpf_prog_run32+0x9d/0xd0 ? __bpf_prog_enter_sleepable_recur+0xad/0x120 ? __bpf_prog_enter_sleepable_recur+0x3e/0x120 bpf_trampoline_6442580665+0x4d/0x1000 __x64_sys_getpgid+0x5/0x30 ? do_syscall_64+0x36/0xb0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK>

    References: https://ubuntu.com/security/CVE-2023-52621, https://git.kernel.org/linus/169410eba271afc9f0fb476d996795aa26770c6d, https://git.kernel.org/stable/c/d6d6fe4bb105595118f12abeed4a7bdd450853f3, https://git.kernel.org/stable/c/483cb92334cd7f1d5387dccc0ab5d595d27a669d, https://git.kernel.org/stable/c/c7f1b6146f4a46d727c0d046284c28b6882c6304, https://git.kernel.org/stable/c/169410eba271afc9f0fb476d996795aa26770c6d, https://www.cve.org/CVERecord?id=CVE-2023-52621, https://ubuntu.com/security/notices/USN-6818-1, https://ubuntu.com/security/notices/USN-6819-1, https://ubuntu.com/security/notices/USN-6818-2, https://ubuntu.com/security/notices/USN-6819-2, https://ubuntu.com/security/notices/USN-6819-3, https://ubuntu.com/security/notices/USN-6818-3, https://ubuntu.com/security/notices/USN-6818-4, https://ubuntu.com/security/notices/USN-6819-4, https://ubuntu.com/security/notices/USN-7166-1, https://ubuntu.com/security/notices/USN-7166-2, https://ubuntu.com/security/notices/USN-7166-3, https://ubuntu.com/security/notices/USN-7186-1, https://ubuntu.com/security/notices/USN-7186-2, https://ubuntu.com/security/notices/USN-7194-1, https://ubuntu.com/security/notices/USN-7166-4

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2023-52621 | CVE-DB