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Vulnerability · Published Mar 12, 2025 · Assigned by Linux

CVE-2025-21855ibmvnic: Don't reference skb after sending to VIOS

High 8.6

In plain English

A high-severity use-after-free in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.4%top 61.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ibmvnic: Don't reference skb after sending to VIOS Previously, after successfully flushing the xmit buffer to VIOS, the tx_bytes stat was incremented by the length of the skb. It is invalid to access the skb memory after sending the buffer to the VIOS because, at any point after sending, the VIOS can trigger an interrupt to free this memory. A race between reading skb->len and freeing the skb is possible (especially during LPM) and will result in use-after-free: ================================================================== BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic] Read of size 4 at addr c00000024eb48a70 by task hxecom/14495 <...> Call Trace: [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable) [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0 [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8 [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0 [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic] [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358 <...> Freed by task 0: kasan_save_stack+0x34/0x68 kasan_save_track+0x2c/0x50 kasan_save_free_info+0x64/0x108 __kasan_mempool_poison_object+0x148/0x2d4 napi_skb_cache_put+0x5c/0x194 net_tx_action+0x154/0x5b8 handle_softirqs+0x20c/0x60c do_softirq_own_stack+0x6c/0x88 <...> The buggy address belongs to the object at c00000024eb48a00 which belongs to the cache skbuff_head_cache of size 224 ==================================================================

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.133-1DEBIAN-CVE-2025-21855
Debian:12linux6.1.133-1DSA-5900-1
Debian:13linux6.12.17-1DEBIAN-CVE-2025-21855
Debian:14linux6.12.17-1DEBIAN-CVE-2025-21855
Ubuntu:22.04:LTSlinux5.15.0-164.174USN-7928-1
Ubuntu:22.04:LTSlinux5.15.0-164.174UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux6.8.0-78.78UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-aws5.15.0-1098.105USN-7928-1
Ubuntu:22.04:LTSlinux-aws5.15.0-1098.105UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-aws6.8.0-1035.37UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1035.37~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure5.15.0-1102.111UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure5.15.0-1102.111USN-7928-1
Ubuntu:24.04:LTSlinux-azure6.8.0-1034.39UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1015.15~24.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1034.39~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1102.111.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1022.23UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gcp5.15.0-1098.107USN-7928-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1098.107UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-gcp6.8.0-1036.38UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1015.15~24.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1036.38~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gke5.15.0-1094.100UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gke5.15.0-1094.100USN-7928-1
Ubuntu:24.04:LTSlinux-gke6.8.0-1032.36UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1081.89USN-7928-1
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1081.89UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1019.21UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-26.26~24.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-78.78~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-ibm5.15.0-1092.95UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-ibm5.15.0-1092.95USN-7928-1
Ubuntu:24.04:LTSlinux-ibm6.8.0-1033.33UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1033.33~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1093.99USN-7928-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1093.99UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-kvm5.15.0-1090.95USN-7928-5
Ubuntu:22.04:LTSlinux-kvm5.15.0-1090.95UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-164.174USN-7928-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-164.174UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-78.78.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1014.15~24.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-78.78.1~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1093.94USN-7928-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1093.94UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1035.38UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1010.10UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1035.38~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1035.38.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1050.50UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1050.50USN-7928-1
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1009.9UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1039.39USN-7928-1
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1039.39UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1022.22UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oracle5.15.0-1095.101UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oracle5.15.0-1095.101USN-7928-1
Ubuntu:24.04:LTSlinux-oracle6.8.0-1032.33UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1032.33~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-raspi5.15.0-1092.95USN-7928-4
Ubuntu:22.04:LTSlinux-raspi5.15.0-1092.95UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-raspi6.8.0-1035.39UBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-78.78~22.04.1UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21855
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1017.18UBUNTU-CVE-2025-21855
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1062.66USN-7928-1
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1062.66UBUNTU-CVE-2025-21855

Affected products (as reported)

VendorProductVersions
Linux Linux 032c5e82847a2214c3196a90f0aeba0ce252de58 – before 501ac6a7e21b82e05207c6b4449812d82820f306032c5e82847a2214c3196a90f0aeba0ce252de58 – before 093b0e5c90592773863f300b908b741622eef597032c5e82847a2214c3196a90f0aeba0ce252de58 – before 25dddd01dcc8ef3acff964dbb32eeb0d89f098e9032c5e82847a2214c3196a90f0aeba0ce252de58 – before abaff2717470e4b5b7c0c3a90e128b211a23da09032c5e82847a2214c3196a90f0aeba0ce252de58 – before bdf5d13aa05ec314d4385b31ac974d6c7e0997c9
Linux Linux 4.5

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

References