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CVE-2026-98261— cifs: Fix server use-after-free in cifs_chan_skip_or_disable()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已解决以下漏洞： cifs：修复 cifs_chan_skip_or_disable() 中服务器使用的 use-after-free（释放后使用）漏洞 当服务器不再支持次要通道时，cifs_chan_skip_or_disable() 会调用 cifs_put_tcp_session() 释放该通道的引用，然后继续通过调用 cifs_signal_cifsd_for_reconnect() 并使用其 primary_server 指针来访问服务器。然而，cifs_put_tcp_sessi

CVSS 8.1 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 50e8363ecc85da49764781da90ebffe1a657b370< 0338489960ddad6368bce55e8adbc176c523093d affected
f591062bdbf4742b7f1622173017f19e927057b0< edd52eae5fcfb8433b6bb0e7cd98db438fe01227 affected
f591062bdbf4742b7f1622173017f19e927057b0< fcc0a935bb6e37ecbf7e4335061309f896f35780 affected
f591062bdbf4742b7f1622173017f19e927057b0< 7a1b27780b113583a94256d58dabfe7c0d9286e7 affected
f591062bdbf4742b7f1622173017f19e927057b0< 717e0a25036b6c92cecace30913b2d874a4c22b8 affected
d61ba1d71ea6039eca7ada870bf3f0c3c8fc12e4 affected
6.6.15< 6.6.158 affected
6.7.3< 6.8 affected
… +7 more rows
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I. Basic Information for CVE-2026-98261

Vulnerability Information
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Vulnerability Title
cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server use-after-free in cifs_chan_skip_or_disable() When a secondary channel is no longer supported by the server, cifs_chan_skip_or_disable() drops the channel reference with cifs_put_tcp_session() and then continues to use the server pointer by calling cifs_signal_cifsd_for_reconnect() on it and reading its primary_server pointer. cifs_put_tcp_session() can drop the last reference of the channel and tear it down, so both the channel and the primary server (whose reference is also dropped by cifs_put_tcp_session()) can be freed before they are signaled for reconnect. Signal the channel and the primary server and capture the primary server pointer before dropping the channel reference with cifs_put_tcp_session().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 50e8363ecc85da49764781da90ebffe1a657b370 ~ 0338489960ddad6368bce55e8adbc176c523093d -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-98261

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III. Intelligence Information for CVE-2026-98261

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Patches & Fixes for CVE-2026-98261 (5)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98254 7.8 HIGH swiotlb: use the adjusted address for the highmem page lookup
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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