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CVE PROGRAM SOURCE RECORD8.6 High

CVE-2025-21855

ibmvnic: Don't reference skb after sending to VIOS

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Status
Published
Published
Updated
Assigning organization
Linux

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 032c5e82847a2214c3196a90f0aeba0ce252de58 to < 501ac6a7e21b82e05207c6b4449812d82820f306affected
  • 032c5e82847a2214c3196a90f0aeba0ce252de58 to < 093b0e5c90592773863f300b908b741622eef597affected
  • 032c5e82847a2214c3196a90f0aeba0ce252de58 to < 25dddd01dcc8ef3acff964dbb32eeb0d89f098e9affected
  • 032c5e82847a2214c3196a90f0aeba0ce252de58 to < abaff2717470e4b5b7c0c3a90e128b211a23da09affected
  • 032c5e82847a2214c3196a90f0aeba0ce252de58 to < bdf5d13aa05ec314d4385b31ac974d6c7e0997c9affected

Linux Linux

Default version status: affected

  • 4.5affected
  • 0 to < 4.5unaffected
  • 6.1.130 to ≤ 6.1.*unaffected
  • 6.6.80 to ≤ 6.6.*unaffected
  • 6.12.17 to ≤ 6.12.*unaffected
  • 6.13.5 to ≤ 6.13.*unaffected
  • 6.14 to ≤ *unaffected

References