CVE-2023-53186skbuff: Fix a race between coalescing and releasing SKBs
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In the Linux kernel, the following vulnerability has been resolved: skbuff: Fix a race between coalescing and releasing SKBs Commit 1effe8ca4e34 ("skbuff: fix coalescing for page_pool fragment recycling") allowed coalescing to proceed with non page pool page and page pool page when @from is cloned, i.e. to->pp_recycle --> false from->pp_recycle --> true skb_cloned(from) --> true However, it actually requires skb_cloned(@from) to hold true until coalescing finishes in this situation. If the other cloned SKB is released while the merging is in process, from_shinfo->nr_frags will be set to 0 toward the end of the function, causing the increment of frag page _refcount to be unexpectedly skipped resulting in inconsistent reference counts. Later when SKB(@to) is released, it frees the page directly even though the page pool page is still in use, leading to use-after-free or double-free errors. So it should be prohibited. The double-free error message below prompted us to investigate: BUG: Bad page state in process swapper/1 pfn:0e0d1 page:00000000c6548b28 refcount:-1 mapcount:0 mapping:0000000000000000 index:0x2 pfn:0xe0d1 flags: 0xfffffc0000000(node=0|zone=1|lastcpupid=0x1fffff) raw: 000fffffc0000000 0000000000000000 ffffffff00000101 0000000000000000 raw: 0000000000000002 0000000000000000 ffffffffffffffff 0000000000000000 page dumped because: nonzero _refcount CPU: 1 PID: 0 Comm: swapper/1 Tainted: G E 6.2.0+ Call Trace: <IRQ> dump_stack_lvl+0x32/0x50 bad_page+0x69/0xf0 free_pcp_prepare+0x260/0x2f0 free_unref_page+0x20/0x1c0 skb_release_data+0x10b/0x1a0 napi_consume_skb+0x56/0x150 net_rx_action+0xf0/0x350 ? __napi_schedule+0x79/0x90 __do_softirq+0xc8/0x2b1 __irq_exit_rcu+0xb9/0xf0 common_interrupt+0x82/0xa0 </IRQ> <TASK> asm_common_interrupt+0x22/0x40 RIP: 0010:default_idle+0xb/0x20
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 53e0961da1c7bbdabd1abebb20de403ec237ec09 before 906a6689bb0191ad2a44131a3377006aa098af59; from 53e0961da1c7bbdabd1abebb20de403ec237ec09 before 71850b5af92da21b4862a9bc55bda61091247d00; 53e0961da1c7bbdabd1abebb20de403ec237ec09 builds before 5f692c992a3bb9a8018e3488098b401a4229e7ec; from 53e0961da1c7bbdabd1abebb20de403ec237ec09 before 0646dc31ca886693274df5749cd0c8c1eaaeb5ca | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15 before 5.15.108; from 5.16 before 6.1.25; from 6.2 before 6.2.12; 6.3; 6.3; 6.3; 6.3; 6.3; and 1 more ranges | NVD |
References
- https://git.kernel.org/stable/c/906a6689bb0191ad2a44131a3377006aa098af59patch
- https://git.kernel.org/stable/c/71850b5af92da21b4862a9bc55bda61091247d00patch
- https://git.kernel.org/stable/c/5f692c992a3bb9a8018e3488098b401a4229e7ecpatch
- https://git.kernel.org/stable/c/0646dc31ca886693274df5749cd0c8c1eaaeb5capatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.