Log in Start free

Vulnerability · Published Dec 30, 2025 · Assigned by Linux

CVE-2023-54258cifs: fix potential oops in cifs_oplock_break

Critical 9.8

In plain English

A critical-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 53.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential oops in cifs_oplock_break With deferred close we can have closes that race with lease breaks, and so with the current checks for whether to send the lease response, oplock_response(), this can mean that an unmount (kill_sb) can occur just before we were checking if the tcon->ses is valid. See below: [Fri Aug 4 04:12:50 2023] RIP: 0010:cifs_oplock_break+0x1f7/0x5b0 [cifs] [Fri Aug 4 04:12:50 2023] Code: 7d a8 48 8b 7d c0 c0 e9 02 48 89 45 b8 41 89 cf e8 3e f5 ff ff 4c 89 f7 41 83 e7 01 e8 82 b3 03 f2 49 8b 45 50 48 85 c0 74 5e <48> 83 78 60 00 74 57 45 84 ff 75 52 48 8b 43 98 48 83 eb 68 48 39 [Fri Aug 4 04:12:50 2023] RSP: 0018:ffffb30607ddbdf8 EFLAGS: 00010206 [Fri Aug 4 04:12:50 2023] RAX: 632d223d32612022 RBX: ffff97136944b1e0 RCX: 0000000080100009 [Fri Aug 4 04:12:50 2023] RDX: 0000000000000001 RSI: 0000000080100009 RDI: ffff97136944b188 [Fri Aug 4 04:12:50 2023] RBP: ffffb30607ddbe58 R08: 0000000000000001 R09: ffffffffc08e0900 [Fri Aug 4 04:12:50 2023] R10: 0000000000000001 R11: 000000000000000f R12: ffff97136944b138 [Fri Aug 4 04:12:50 2023] R13: ffff97149147c000 R14: ffff97136944b188 R15: 0000000000000000 [Fri Aug 4 04:12:50 2023] FS: 0000000000000000(0000) GS:ffff9714f7c00000(0000) knlGS:0000000000000000 [Fri Aug 4 04:12:50 2023] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [Fri Aug 4 04:12:50 2023] CR2: 00007fd8de9c7590 CR3: 000000011228e000 CR4: 0000000000350ef0 [Fri Aug 4 04:12:50 2023] Call Trace: [Fri Aug 4 04:12:50 2023] <TASK> [Fri Aug 4 04:12:50 2023] process_one_work+0x225/0x3d0 [Fri Aug 4 04:12:50 2023] worker_thread+0x4d/0x3e0 [Fri Aug 4 04:12:50 2023] ? process_one_work+0x3d0/0x3d0 [Fri Aug 4 04:12:50 2023] kthread+0x12a/0x150 [Fri Aug 4 04:12:50 2023] ? set_kthread_struct+0x50/0x50 [Fri Aug 4 04:12:50 2023] ret_from_fork+0x22/0x30 [Fri Aug 4 04:12:50 2023] </TASK> To fix this change the ordering of the checks before sending the oplock_response to first check if the openFileList is empty.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.4.13-1DEBIAN-CVE-2023-54258
Debian:14linux6.4.13-1DEBIAN-CVE-2023-54258
Ubuntu:22.04:LTSlinux5.15.0-91.101UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-aws5.15.0-1051.56UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure5.15.0-1051.59UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1051.59.1UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-gcp5.15.0-1048.56UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-gke5.15.0-1048.53UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1034.40UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-ibm5.15.0-1044.47UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1046.52UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-kvm5.15.0-1048.53UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-91.101UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1042.42UBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1020.20UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1007.7UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-oracle5.15.0-1049.55UBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-raspi5.15.0-1044.47UBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-54258
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1027.31UBUNTU-CVE-2023-54258

Affected products (as reported)

VendorProductVersions
Linux Linux 63fb45ddc491895c4b36664e0c2c3b548545ae93 – before b99f490ea87ebcca3a429fd8837067feb56a4c7c1bf709b9625001eefdd41048c5f4c7544ee33394 – before 5ee28bcfbaacf289eb25c662a2862542ea6ce6a73b4c15171c3ce9120c81f5564b9367d8d0f4219c – before 6b67a6d2e50634fe127e656147c81915955e9f5eda787d5b74983f7525d1eb4b9c0b4aff2821511a – before e8f5f849ffce24490eb9449e98312b66c0dba76fcff7fb969edaeff2bc80c8a8f7cf7b0c8df32da76.3.13 – before 6.4
Linux Linux 5.15.121 – before 5.15.1286.1.39 – before 6.1.476.4.4 – before 6.4.12

References