🛡️ CVE-2024-56558 on Ubuntu — linux

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: make sure exp active before svc_export_show The function e_show was called with protection from RCU. This only ensures that exp will not be freed. Therefore, the reference count for exp can drop to zero, which will trigger a refcount use-after-free warning when exp_get is called. To resolve this issue, use cache_get_rcu to ensure that exp remains active. ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 3 PID: 819 at lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 3 UID: 0 PID: 819 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 ... Call Trace: <TASK> e_show+0x20b/0x230 [nfsd] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Distribution advisory

This page covers CVE-2024-56558 as tracked by Ubuntu, for the package linux. The fix is available in version 6.8.0-58.60; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector: Local — a local account, shell or session on the host is needed.
Attack complexity: Low — the attack works reliably, with no preparation.
Privileges required: Low — an ordinary user account is enough.
User interaction: None — nobody has to be tricked into anything.
Scope: Unchanged — the damage stays inside the vulnerable component.
Confidentiality impact: High — total loss, or loss the attacker controls.
Integrity impact: High — total loss, or loss the attacker controls.
Availability impact: High — total loss, or loss the attacker controls.

Affected software

UBUNTU-CVE-2024-56558 is recorded against 131 packages.

linux (fixed in 6.8.0-58.60)
linux-allwinner-5.19
linux-aws (fixed in 6.8.0-1027.29)
linux-aws-5.0
linux-aws-5.11
linux-aws-5.13
linux-aws-5.15 (fixed in 5.15.0-1080.87~20.04.1)
linux-aws-5.19
linux-aws-5.3
linux-aws-5.4 (fixed in 5.4.0-1142.152~18.04.1)
linux-aws-5.8
linux-aws-6.2
linux-aws-6.5
linux-aws-6.8 (fixed in 6.8.0-1027.29~22.04.1)
linux-aws-fips (fixed in 5.15.0-1080.87+fips1)
linux-azure (fixed in 6.8.0-1027.32)
linux-azure-5.11
linux-azure-5.13
linux-azure-5.15 (fixed in 5.15.0-1086.95~20.04.1)
linux-azure-5.19
linux-azure-5.3
linux-azure-5.4 (fixed in 5.4.0-1147.154~18.04.1)
linux-azure-5.8
linux-azure-6.11 (fixed in 6.11.0-1012.12~24.04.1)

Show the remaining 107 packages

linux-azure-6.2
linux-azure-6.5
linux-azure-6.8 (fixed in 6.8.0-1027.32~22.04.1)
linux-azure-edge
linux-azure-fde
linux-azure-fde-5.19
linux-azure-fde-6.2
linux-azure-fips (fixed in 5.15.0-1083.92+fips1)
linux-azure-nvidia (fixed in 6.8.0-1014.15)
linux-bluefield
linux-fips (fixed in 6.8.0-78.78+fips1)
linux-gcp (fixed in 6.8.0-1028.30)
linux-gcp-5.11
linux-gcp-5.13
linux-gcp-5.15 (fixed in 5.15.0-1081.90~20.04.1)
linux-gcp-5.19
linux-gcp-5.3
linux-gcp-5.4 (fixed in 5.4.0-1145.154~18.04.1)
linux-gcp-5.8
linux-gcp-6.11 (fixed in 6.11.0-1011.11~24.04.1)
linux-gcp-6.2
linux-gcp-6.5
linux-gcp-6.8 (fixed in 6.8.0-1028.30~22.04.1)
linux-gcp-fips (fixed in 5.15.0-1079.88+fips1)
linux-gke (fixed in 6.8.0-1023.27)
linux-gke-4.15
linux-gke-5.15
linux-gke-5.4
linux-gkeop (fixed in 6.8.0-1010.12)
linux-gkeop-5.15
linux-gkeop-5.4
linux-hwe
linux-hwe-5.11
linux-hwe-5.13
linux-hwe-5.15 (fixed in 5.15.0-136.147~20.04.1)
linux-hwe-5.19
linux-hwe-5.4 (fixed in 5.4.0-211.231~18.04.1)
linux-hwe-5.8
linux-hwe-6.11 (fixed in 6.11.0-21.21~24.04.1)
linux-hwe-6.2
linux-hwe-6.5
linux-hwe-6.8 (fixed in 6.8.0-58.60~22.04.1)
linux-hwe-edge
linux-ibm (fixed in 6.8.0-1024.24)
linux-ibm-5.15 (fixed in 5.15.0-1074.77~20.04.1)
linux-ibm-5.4 (fixed in 5.4.0-1090.95~18.04.1)
linux-ibm-6.8 (fixed in 6.8.0-1024.24~22.04.1)
linux-intel-5.13
linux-intel-iot-realtime (fixed in 5.15.0-1073.75)
linux-intel-iotg (fixed in 5.15.0-1075.81)
linux-intel-iotg-5.15 (fixed in 5.15.0-1077.83~20.04.1)
linux-iot (fixed in 5.4.0-1048.51)
linux-kvm (fixed in 5.15.0-1076.81)
linux-lowlatency (fixed in 6.8.0-58.60.1)
linux-lowlatency-hwe-5.15 (fixed in 5.15.0-135.146~20.04.1)
linux-lowlatency-hwe-5.19
linux-lowlatency-hwe-6.2
linux-lowlatency-hwe-6.5
linux-lowlatency-hwe-6.8 (fixed in 6.8.0-58.60.1~22.04.1)
linux-nvidia (fixed in 6.8.0-1026.29)
linux-nvidia-6.11 (fixed in 6.11.0-1007.7)
linux-nvidia-6.2
linux-nvidia-6.5
linux-nvidia-6.8 (fixed in 6.8.0-1026.29~22.04.1)
linux-nvidia-lowlatency (fixed in 6.8.0-1026.29.1)
linux-nvidia-tegra (fixed in 6.8.0-1008.8)
linux-nvidia-tegra-5.15 (fixed in 5.15.0-1039.39~20.04.1)
linux-nvidia-tegra-igx (fixed in 5.15.0-1021.21)
linux-oem
linux-oem-5.10
linux-oem-5.13
linux-oem-5.14
linux-oem-5.17
linux-oem-5.6
linux-oem-6.0
linux-oem-6.1
linux-oem-6.11 (fixed in 6.11.0-1017.17)
linux-oem-6.5
linux-oem-6.8 (fixed in 6.8.0-1026.26)
linux-oracle (fixed in 6.8.0-1024.25)
linux-oracle-5.0
linux-oracle-5.11
linux-oracle-5.13
linux-oracle-5.15 (fixed in 5.15.0-1077.83~20.04.1)
linux-oracle-5.3
linux-oracle-5.4 (fixed in 5.4.0-1140.149~18.04.1)
linux-oracle-5.8
linux-oracle-6.5
linux-oracle-6.8 (fixed in 6.8.0-1024.25~22.04.1)
linux-raspi (fixed in 6.8.0-1028.32)
linux-raspi-5.4 (fixed in 5.4.0-1129.142~18.04.1)
linux-raspi-realtime (fixed in 6.8.0-2023.24)
linux-raspi2
linux-realtime (fixed in 6.8.1-1020.21)
linux-realtime-6.8 (fixed in 6.8.1-1020.21~22.04.1)
linux-riscv (fixed in 6.8.0-58.60.1)
linux-riscv-5.11
linux-riscv-5.15 (fixed in 5.15.0-1075.79~20.04.1)
linux-riscv-5.19
linux-riscv-5.8
linux-riscv-6.5
linux-riscv-6.8 (fixed in 6.8.0-58.60.1~22.04.1)
linux-starfive-5.19
linux-starfive-6.2
linux-starfive-6.5
linux-xilinx (fixed in 6.8.0-1017.18)
linux-xilinx-zynqmp (fixed in 5.15.0-1044.48)

Timeline and source

Published on 27 December 2024 and last revised on 17 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

Other advisories for this package

linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

DEBIAN-CVE-2022-4994 (published 30 Jul 2026)
CVE-2026-35233 (4.4 Medium, published 1 May 2026)
CVE-2026-21996 (3.3 Low, published 1 May 2026)
CVE-2026-21991 (5.5 Medium, published 16 Mar 2026)
CGA-mcwh-q4vm-9f29 (published 29 Jan 2026)
CGA-w6xv-3fg4-grm5 (published 29 Jan 2026)
CGA-7wmc-rrpx-535w (published 7 Jan 2026)
CGA-5g29-pc3v-86pw (published 7 Jan 2026)

CVE-2024-56558 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

BellSoft — BELL-CVE-2024-56558 Base record — CVE-2024-56558 Debian — DEBIAN-CVE-2024-56558

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2024-12-27

Updated 2026-08-20

Modified 2026-08-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
linux	—	6.8.0-58.60
linux-allwinner-5.19	—	—
linux-aws	—	6.8.0-1027.29
linux-aws-5.0	—	—
linux-aws-5.11	—	—
linux-aws-5.13	—	—
linux-aws-5.15	—	5.15.0-1080.87~20.04.1
linux-aws-5.19	—	—
linux-aws-5.3	—	—
linux-aws-5.4	—	5.4.0-1142.152~18.04.1
linux-aws-5.8	—	—
linux-aws-6.2	—	—
linux-aws-6.5	—	—
linux-aws-6.8	—	6.8.0-1027.29~22.04.1
linux-aws-fips	—	5.15.0-1080.87+fips1
linux-azure	—	6.8.0-1027.32
linux-azure-5.11	—	—
linux-azure-5.13	—	—
linux-azure-5.15	—	5.15.0-1086.95~20.04.1
linux-azure-5.19	—	—
linux-azure-5.3	—	—
linux-azure-5.4	—	5.4.0-1147.154~18.04.1
linux-azure-5.8	—	—
linux-azure-6.11	—	6.11.0-1012.12~24.04.1
linux-azure-6.2	—	—
linux-azure-6.5	—	—
linux-azure-6.8	—	6.8.0-1027.32~22.04.1
linux-azure-edge	—	—
linux-azure-fde	—	—
linux-azure-fde-5.19	—	—
linux-azure-fde-6.2	—	—
linux-azure-fips	—	5.15.0-1083.92+fips1
linux-azure-nvidia	—	6.8.0-1014.15
linux-bluefield	—	—
linux-fips	—	6.8.0-78.78+fips1
linux-gcp	—	6.8.0-1028.30
linux-gcp-5.11	—	—
linux-gcp-5.13	—	—
linux-gcp-5.15	—	5.15.0-1081.90~20.04.1
linux-gcp-5.19	—	—
linux-gcp-5.3	—	—
linux-gcp-5.4	—	5.4.0-1145.154~18.04.1
linux-gcp-5.8	—	—
linux-gcp-6.11	—	6.11.0-1011.11~24.04.1
linux-gcp-6.2	—	—
linux-gcp-6.5	—	—
linux-gcp-6.8	—	6.8.0-1028.30~22.04.1
linux-gcp-fips	—	5.15.0-1079.88+fips1
linux-gke	—	6.8.0-1023.27
linux-gke-4.15	—	—
linux-gke-5.15	—	—
linux-gke-5.4	—	—
linux-gkeop	—	6.8.0-1010.12
linux-gkeop-5.15	—	—
linux-gkeop-5.4	—	—
linux-hwe	—	—
linux-hwe-5.11	—	—
linux-hwe-5.13	—	—
linux-hwe-5.15	—	5.15.0-136.147~20.04.1
linux-hwe-5.19	—	—
linux-hwe-5.4	—	5.4.0-211.231~18.04.1
linux-hwe-5.8	—	—
linux-hwe-6.11	—	6.11.0-21.21~24.04.1
linux-hwe-6.2	—	—
linux-hwe-6.5	—	—
linux-hwe-6.8	—	6.8.0-58.60~22.04.1
linux-hwe-edge	—	—
linux-ibm	—	6.8.0-1024.24
linux-ibm-5.15	—	5.15.0-1074.77~20.04.1
linux-ibm-5.4	—	5.4.0-1090.95~18.04.1
linux-ibm-6.8	—	6.8.0-1024.24~22.04.1
linux-intel-5.13	—	—
linux-intel-iot-realtime	—	5.15.0-1073.75
linux-intel-iotg	—	5.15.0-1075.81
linux-intel-iotg-5.15	—	5.15.0-1077.83~20.04.1
linux-iot	—	5.4.0-1048.51
linux-kvm	—	5.15.0-1076.81
linux-lowlatency	—	6.8.0-58.60.1
linux-lowlatency-hwe-5.15	—	5.15.0-135.146~20.04.1
linux-lowlatency-hwe-5.19	—	—
linux-lowlatency-hwe-6.2	—	—
linux-lowlatency-hwe-6.5	—	—
linux-lowlatency-hwe-6.8	—	6.8.0-58.60.1~22.04.1
linux-nvidia	—	6.8.0-1026.29
linux-nvidia-6.11	—	6.11.0-1007.7
linux-nvidia-6.2	—	—
linux-nvidia-6.5	—	—
linux-nvidia-6.8	—	6.8.0-1026.29~22.04.1
linux-nvidia-lowlatency	—	6.8.0-1026.29.1
linux-nvidia-tegra	—	6.8.0-1008.8
linux-nvidia-tegra-5.15	—	5.15.0-1039.39~20.04.1
linux-nvidia-tegra-igx	—	5.15.0-1021.21
linux-oem	—	—
linux-oem-5.10	—	—
linux-oem-5.13	—	—
linux-oem-5.14	—	—
linux-oem-5.17	—	—
linux-oem-5.6	—	—
linux-oem-6.0	—	—
linux-oem-6.1	—	—
linux-oem-6.11	—	6.11.0-1017.17
linux-oem-6.5	—	—
linux-oem-6.8	—	6.8.0-1026.26
linux-oracle	—	6.8.0-1024.25
linux-oracle-5.0	—	—
linux-oracle-5.11	—	—
linux-oracle-5.13	—	—
linux-oracle-5.15	—	5.15.0-1077.83~20.04.1
linux-oracle-5.3	—	—
linux-oracle-5.4	—	5.4.0-1140.149~18.04.1
linux-oracle-5.8	—	—
linux-oracle-6.5	—	—
linux-oracle-6.8	—	6.8.0-1024.25~22.04.1
linux-raspi	—	6.8.0-1028.32
linux-raspi-5.4	—	5.4.0-1129.142~18.04.1
linux-raspi-realtime	—	6.8.0-2023.24
linux-raspi2	—	—
linux-realtime	—	6.8.1-1020.21
linux-realtime-6.8	—	6.8.1-1020.21~22.04.1
linux-riscv	—	6.8.0-58.60.1
linux-riscv-5.11	—	—
linux-riscv-5.15	—	5.15.0-1075.79~20.04.1
linux-riscv-5.19	—	—
linux-riscv-5.8	—	—
linux-riscv-6.5	—	—
linux-riscv-6.8	—	6.8.0-58.60.1~22.04.1
linux-starfive-5.19	—	—
linux-starfive-6.2	—	—
linux-starfive-6.5	—	—
linux-xilinx	—	6.8.0-1017.18
linux-xilinx-zynqmp	—	5.15.0-1044.48

References

REPORT https://ubuntu.com/security/CVE-2024-56558

REPORT https://www.cve.org/CVERecord?id=CVE-2024-56558

REPORT https://git.kernel.org/linus/be8f982c369c965faffa198b46060f8853e0f1f0

REPORT https://git.kernel.org/stable/c/1cecfdbc6bfc89c516d286884c7f29267b95de2b

REPORT https://git.kernel.org/stable/c/6cefcadd34e3c71c81ea64b899a0daa86314a51a

REPORT https://git.kernel.org/stable/c/7365d1f8de63cffdbbaa2287ce0205438e1a922f

REPORT https://git.kernel.org/stable/c/7d8f7816bebcd2e7400bb4d786eccb8f33c9f9ec

REPORT https://git.kernel.org/stable/c/7fd29d284b55c2274f7a748e6c5f25b4758b8da5

REPORT https://git.kernel.org/stable/c/be8f982c369c965faffa198b46060f8853e0f1f0

REPORT https://git.kernel.org/stable/c/e2fa0d0e327279a8defb87b263cd0bf288fd9261

ADVISORY https://ubuntu.com/security/notices/USN-7379-1

ADVISORY https://ubuntu.com/security/notices/USN-7380-1

ADVISORY https://ubuntu.com/security/notices/USN-7381-1

ADVISORY https://ubuntu.com/security/notices/USN-7382-1

ADVISORY https://ubuntu.com/security/notices/USN-7387-1

ADVISORY https://ubuntu.com/security/notices/USN-7388-1

ADVISORY https://ubuntu.com/security/notices/USN-7389-1

ADVISORY https://ubuntu.com/security/notices/USN-7390-1

ADVISORY https://ubuntu.com/security/notices/USN-7387-2

ADVISORY https://ubuntu.com/security/notices/USN-7387-3

ADVISORY https://ubuntu.com/security/notices/USN-7391-1

ADVISORY https://ubuntu.com/security/notices/USN-7392-1

ADVISORY https://ubuntu.com/security/notices/USN-7393-1

ADVISORY https://ubuntu.com/security/notices/USN-7392-2

ADVISORY https://ubuntu.com/security/notices/USN-7379-2

ADVISORY https://ubuntu.com/security/notices/USN-7392-3

ADVISORY https://ubuntu.com/security/notices/USN-7401-1

ADVISORY https://ubuntu.com/security/notices/USN-7392-4

ADVISORY https://ubuntu.com/security/notices/USN-7407-1

ADVISORY https://ubuntu.com/security/notices/USN-7413-1

ADVISORY https://ubuntu.com/security/notices/USN-7421-1

ADVISORY https://ubuntu.com/security/notices/USN-7449-1

ADVISORY https://ubuntu.com/security/notices/USN-7450-1

ADVISORY https://ubuntu.com/security/notices/USN-7451-1

ADVISORY https://ubuntu.com/security/notices/USN-7452-1

ADVISORY https://ubuntu.com/security/notices/USN-7453-1

ADVISORY https://ubuntu.com/security/notices/USN-7458-1

ADVISORY https://ubuntu.com/security/notices/USN-7459-1

ADVISORY https://ubuntu.com/security/notices/USN-7463-1

ADVISORY https://ubuntu.com/security/notices/USN-7449-2

ADVISORY https://ubuntu.com/security/notices/USN-7459-2

ADVISORY https://ubuntu.com/security/notices/USN-7468-1

ADVISORY https://ubuntu.com/security/notices/USN-7523-1

ADVISORY https://ubuntu.com/security/notices/USN-7524-1

ADVISORY https://ubuntu.com/security/notices/USN-7539-1

ADVISORY https://ubuntu.com/security/notices/USN-7540-1

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🛡️ CVE-2024-56558 on Ubuntu — linux

Description

Distribution advisory

How this vulnerability can be exploited

CVSS metrics in full

Affected software

Timeline and source

References

Other advisories for this package

CVE-2024-56558 on other distributions

Is linux part of your stack?

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