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 Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-develUpgrade kernel6.18-tools-develUpgrade kernel6.18-modules-extra-commonUpgrade bpftool6.18Upgrade kernel6.18Upgrade perf6.18Upgrade python3-perf6.18Upgrade kernel6.18-toolsUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel6.18-headersUpgrade microvm-kernel6.18Upgrade perf6.18-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel-livepatch-6.18.35-68.127 | Aug 10, 2026 | Jul 19, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-azure-fdeUpgrade linux-image-raspi-7.0Upgrade linux-image-nvidia-bosUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-awsUpgrade linux-image-oracle-7.0Upgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-ibmUpgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-aws-7.0Upgrade linux-image-azureUpgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-raspiUpgrade linux-image-aws-64k-7.0Upgrade linux-image-raspi-realtimeUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-oracle-64kUpgrade linux-image-oracleUpgrade linux-image-nvidiaUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-gcpUpgrade linux-image-azure-fde-7.0Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-7.0.0-1009-awsUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-1010-azureUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64k-hwe-26.04 | Jul 21, 2026 | Jul 20, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 3, 2026 | Jul 19, 2026 |
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