Critical severity9.8NVD Advisory· Published Jul 19, 2026· Updated Oct 16, 2026
CVE-2026-64136
CVE-2026-64136
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to change cifs_tcp_ses_lock for tc_lock around tc_count changes.
There was missing lock around tc_count increment inside smb2_find_smb_sess_tcon_unlocked().
Affected products
82cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 5 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.6.128,<6.6.142
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
- (no CPE)
- osv-coords76 versionspkg:linux/kernelpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-64kpkg:rpm/almalinux/kernel-64k-corepkg:rpm/almalinux/kernel-64k-debugpkg:rpm/almalinux/kernel-64k-debug-corepkg:rpm/almalinux/kernel-64k-debug-develpkg:rpm/almalinux/kernel-64k-debug-devel-matchedpkg:rpm/almalinux/kernel-64k-debug-modulespkg:rpm/almalinux/kernel-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-debug-modules-extrapkg:rpm/almalinux/kernel-64k-develpkg:rpm/almalinux/kernel-64k-devel-matchedpkg:rpm/almalinux/kernel-64k-modulespkg:rpm/almalinux/kernel-64k-modules-corepkg:rpm/almalinux/kernel-64k-modules-extrapkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-debug-devel-matchedpkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-debug-modules-corepkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-debug-uki-virtpkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-devel-matchedpkg:rpm/almalinux/kernel-docpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-modules-corepkg:rpm/almalinux/kernel-modules-extrapkg:rpm/almalinux/kernel-modules-extra-matchedpkg:rpm/almalinux/kernel-rtpkg:rpm/almalinux/kernel-rt-64kpkg:rpm/almalinux/kernel-rt-64k-corepkg:rpm/almalinux/kernel-rt-64k-debugpkg:rpm/almalinux/kernel-rt-64k-debug-corepkg:rpm/almalinux/kernel-rt-64k-debug-develpkg:rpm/almalinux/kernel-rt-64k-debug-modulespkg:rpm/almalinux/kernel-rt-64k-debug-modules-corepkg:rpm/almalinux/kernel-rt-64k-debug-modules-extrapkg:rpm/almalinux/kernel-rt-64k-develpkg:rpm/almalinux/kernel-rt-64k-modulespkg:rpm/almalinux/kernel-rt-64k-modules-corepkg:rpm/almalinux/kernel-rt-64k-modules-extrapkg:rpm/almalinux/kernel-rt-corepkg:rpm/almalinux/kernel-rt-debugpkg:rpm/almalinux/kernel-rt-debug-corepkg:rpm/almalinux/kernel-rt-debug-develpkg:rpm/almalinux/kernel-rt-debug-modulespkg:rpm/almalinux/kernel-rt-debug-modules-corepkg:rpm/almalinux/kernel-rt-debug-modules-extrapkg:rpm/almalinux/kernel-rt-develpkg:rpm/almalinux/kernel-rt-modulespkg:rpm/almalinux/kernel-rt-modules-corepkg:rpm/almalinux/kernel-rt-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/kernel-uki-virtpkg:rpm/almalinux/kernel-uki-virt-addonspkg:rpm/almalinux/kernel-zfcpdumppkg:rpm/almalinux/kernel-zfcpdump-corepkg:rpm/almalinux/kernel-zfcpdump-develpkg:rpm/almalinux/kernel-zfcpdump-devel-matchedpkg:rpm/almalinux/kernel-zfcpdump-modulespkg:rpm/almalinux/kernel-zfcpdump-modules-corepkg:rpm/almalinux/kernel-zfcpdump-modules-extrapkg:rpm/almalinux/libperfpkg:rpm/almalinux/perfpkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/rtlapkg:rpm/almalinux/rv
< 6.6.142+ 75 more
- (no CPE)range: < 6.6.142
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
- (no CPE)range: < 6.12.0-211.50.1.el10_2
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7nvdPatch
- git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41nvdPatch
- git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0dnvdPatch
- git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416anvdPatch
- git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fdnvdPatch
News mentions
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