Critical 9.8Published Jul 19, 2026

CVE-2026-64061netfs: Fix early put of sink folio in netfs_read_gaps()

Updated under an hour ago (Oct 27, 2026, 3:10 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix early put of sink folio in netfs_read_gaps() Fix netfs_read_gaps() to release the sink page it uses after waiting for the request to complete. The way the sink page is used is that an ITER_BVEC-class iterator is created that has the gaps from the target folio at either end, but has the sink page tiled over the middle so that a single read op can fill in both gaps. The bug was found by KASAN detecting a UAF on the generic/075 xfstest in the cifsd kernel thread that handles reception of data from the TCP socket: BUG: KASAN: use-after-free in _copy_to_iter+0x48a/0xa20 Write of size 885 at addr ffff888107f92000 by task cifsd/1285 CPU: 2 UID: 0 PID: 1285 Comm: cifsd Not tainted 7.0.0 #6 PREEMPT(lazy) Call Trace: dump_stack_lvl+0x5d/0x80 print_report+0x17f/0x4f1 kasan_report+0x100/0x1e0 kasan_check_range+0x10f/0x1e0 __asan_memcpy+0x3c/0x60 _copy_to_iter+0x48a/0xa20 __skb_datagram_iter+0x2c9/0x430 skb_copy_datagram_iter+0x6e/0x160 tcp_recvmsg_locked+0xce0/0x1130 tcp_recvmsg+0xeb/0x300 inet_recvmsg+0xcf/0x3a0 sock_recvmsg+0xea/0x100 cifs_readv_from_socket+0x3a6/0x4d0 [cifs] cifs_read_iter_from_socket+0xdd/0x130 [cifs] cifs_readv_receive+0xaad/0xb10 [cifs] cifs_demultiplex_thread+0x1148/0x1740 [cifs] kthread+0x1cf/0x210

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/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: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ee4cdf7ba857a894ad1650d6ab77669cbbfa329e before 2a39d49c8d97df8cb8fa80c10859bc1ba7358c6b; from ee4cdf7ba857a894ad1650d6ab77669cbbfa329e before d4f4bc87c76511cf2532448b0fa40c25e894bd7d; from ee4cdf7ba857a894ad1650d6ab77669cbbfa329e before 412e8bad48967fd34295866636c028befd27d8b9; from ee4cdf7ba857a894ad1650d6ab77669cbbfa329e before 3e5dd91b87a8b1450217b56a336bee315f40da7d	CNA record
linux linux_kernel linux:linux_kernel	from 6.12 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1	NVD

References

References

https://git.kernel.org/stable/c/2a39d49c8d97df8cb8fa80c10859bc1ba7358c6b	patch
https://git.kernel.org/stable/c/d4f4bc87c76511cf2532448b0fa40c25e894bd7d	patch
https://git.kernel.org/stable/c/412e8bad48967fd34295866636c028befd27d8b9	patch
https://git.kernel.org/stable/c/3e5dd91b87a8b1450217b56a336bee315f40da7d	patch

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.