Critical severity9.8NVD Advisory· Published Aug 6, 2026· Updated Aug 17, 2026
CVE-2026-64597
CVE-2026-64597
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix double-free in SMB2_close() replay
A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_close_init() fails before the next send, cleanup retains the previous buffer type and frees that response again.
Reset response bookkeeping before each attempt to prevent the stale free.
Affected products
77- osv-coords76 versionspkg:rpm/almalinux/kernel-64k-debug-devel-matchedpkg:rpm/almalinux/kernel-rt-debug-develpkg:rpm/almalinux/kernel-tools-libspkg:linux/kernelpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-64k-modulespkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-rt-64kpkg:rpm/almalinux/kernel-rt-64k-corepkg:rpm/almalinux/kernel-rt-corepkg:rpm/almalinux/kernel-rt-debug-modules-extrapkg:rpm/almalinux/kernel-rt-develpkg:rpm/almalinux/kernel-rt-modulespkg:rpm/almalinux/kernel-zfcpdump-develpkg:rpm/almalinux/kernel-zfcpdump-devel-matchedpkg:rpm/almalinux/kernel-zfcpdump-modulespkg:rpm/opensuse/kernel-source&distro=openSUSE%20Tumbleweedpkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-rtpkg:rpm/almalinux/kernel-rt-debug-modules-corepkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/kernel-64k-debug-modulespkg:rpm/almalinux/kernel-64k-develpkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-rt-64k-develpkg:rpm/almalinux/kernel-rt-debug-modulespkg:rpm/almalinux/kernel-uki-virtpkg:rpm/almalinux/kernel-zfcpdump-corepkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-modules-corepkg:rpm/almalinux/kernel-rt-64k-modulespkg:rpm/almalinux/kernel-64kpkg:rpm/almalinux/kernel-64k-corepkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-modules-extrapkg: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-modules-corepkg:rpm/almalinux/kernel-rt-64k-modules-extrapkg:rpm/almalinux/kernel-rt-debugpkg:rpm/almalinux/kernel-rt-debug-corepkg:rpm/almalinux/kernel-rt-modules-corepkg:rpm/almalinux/kernel-rt-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/kernel-zfcpdump-modules-corepkg:rpm/almalinux/kernel-zfcpdump-modules-extrapkg:rpm/almalinux/libperfpkg:rpm/almalinux/rtlapkg:rpm/almalinux/rvpkg:rpm/almalinux/kernel-64k-debug-develpkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-devel-matchedpkg:rpm/almalinux/kernel-rt-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-modules-extrapkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-docpkg:rpm/almalinux/kernel-rt-64k-debug-modules-extrapkg:rpm/almalinux/kernel-64k-devel-matchedpkg:rpm/almalinux/kernel-64k-modules-corepkg:rpm/almalinux/kernel-debug-modules-corepkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-64k-debug-corepkg:rpm/almalinux/kernel-debug-uki-virtpkg:rpm/almalinux/kernel-rt-64k-debug-modulespkg:rpm/almalinux/kernel-64k-debugpkg:rpm/almalinux/kernel-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-debug-modules-extrapkg:rpm/almalinux/kernel-debug-devel-matchedpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-uki-virt-addonspkg:rpm/almalinux/kernel-zfcpdumppkg:rpm/almalinux/perf
< 5.14.0-687.46.1.el9_8+ 75 more
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- (no CPE)range: < 5.14.0-687.46.1.el9_8
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- (no CPE)range: < 5.14.0-687.46.1.el9_8
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- (no CPE)range: < 5.14.0-687.46.1.el9_8
- (no CPE)range: < 5.14.0-687.46.1.el9_8
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- (no CPE)range: < 5.14.0-687.46.1.el9_8
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3nvd
- git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66anvd
- git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1nvd
- git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13nvd
- git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8feenvd
News mentions
1- Linux Kernel: 25 Vulnerabilities Disclosed in Batch Affecting x86, KVM, USB, and NetworkingVypr Intelligence · Aug 6, 2026