CVE-2025-21855— ibmvnic: Don't reference skb after sending to VIOS
Affected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 032c5e82847a2214c3196a90f0aeba0ce252de58< 501ac6a7e21b82e05207c6b4449812d82820f306 | affected |
032c5e82847a2214c3196a90f0aeba0ce252de58< 093b0e5c90592773863f300b908b741622eef597 | affected | ||
032c5e82847a2214c3196a90f0aeba0ce252de58< 25dddd01dcc8ef3acff964dbb32eeb0d89f098e9 | affected | ||
032c5e82847a2214c3196a90f0aeba0ce252de58< abaff2717470e4b5b7c0c3a90e128b211a23da09 | affected | ||
032c5e82847a2214c3196a90f0aeba0ce252de58< bdf5d13aa05ec314d4385b31ac974d6c7e0997c9 | affected | ||
4.5 | affected | ||
< 4.5 | unaffected | ||
6.1.130≤ 6.1.* | unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2025-21855
Vulnerability Information
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Vulnerability Title
ibmvnic: Don't reference skb after sending to VIOS
Source: NVD (National Vulnerability Database)
Vulnerability 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 ==================================================================
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在发送skb后仍访问其内存，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-21855
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|---|
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Other References for CVE-2025-21855 (4)
Same Patch Batch · Linux · 2025-03-12 · 26 CVEs total
| CVE-2025-21853 | bpf: avoid holding freeze_mutex during mmap operation | |
| CVE-2024-58087 | ksmbd: fix racy issue from session lookup and expire | |
| CVE-2024-58088 | bpf: Fix deadlock when freeing cgroup storage | |
| CVE-2024-58089 | btrfs: fix double accounting race when btrfs_run_delalloc_range() failed | |
| CVE-2025-21844 | smb: client: Add check for next_buffer in receive_encrypted_standard() | |
| CVE-2025-21845 | mtd: spi-nor: sst: Fix SST write failure | |
| CVE-2025-21846 | acct: perform last write from workqueue | |
| CVE-2025-21848 | nfp: bpf: Add check for nfp_app_ctrl_msg_alloc() | |
| CVE-2025-21847 | ASoC: SOF: stream-ipc: Check for cstream nullity in sof_ipc_msg_data() | |
| CVE-2025-21849 | drm/i915/gt: Use spin_lock_irqsave() in interruptible context | |
| CVE-2025-21851 | bpf: Fix softlockup in arena_map_free on 64k page kernel | |
| CVE-2025-21850 | nvmet: Fix crash when a namespace is disabled | |
| CVE-2025-21852 | net: Add rx_skb of kfree_skb to raw_tp_null_args[]. | |
| CVE-2025-21866 | powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC | |
| CVE-2025-21854 | sockmap, vsock: For connectible sockets allow only connected | |
| CVE-2025-21856 | s390/ism: add release function for struct device | |
| CVE-2025-21857 | net/sched: cls_api: fix error handling causing NULL dereference | |
| CVE-2025-21858 | geneve: Fix use-after-free in geneve_find_dev(). | |
| CVE-2025-21859 | USB: gadget: f_midi: f_midi_complete to call queue_work | |
| CVE-2025-21861 | mm/migrate_device: don't add folio to be freed to LRU in migrate_device_finalize() |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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