CVE-2026-89637High· 7.0▾ TwilightA flaw was found in the Linux kernel's Server Message Block (SMB) client. When processing a malformed secondary TRANSACT2 response, a use-after-free (UAF) vulnerability and a buffer leak can occur in the `cifs_check_trans2()` function. Thi…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 7.1
0.2% → 0.6%
— → 7.1
none → high
— → 9.8
none → critical
9.8 → 7.1
critical → high
7.1 → 9.8
high → critical
9.8 → 7.1
critical → high
Last analysed / modified upstream
7.1 → 7
A flaw was found in the Linux kernel's Server Message Block (SMB) client. When processing a malformed secondary TRANSACT2 response, a use-after-free (UAF) vulnerability and a buffer leak can occur in the cifs_check_trans2() function. This can lead to a dangling buffer being reused by the demux thread, potentially allowing an attacker to achieve arbitrary code execution or cause a denial of service.
kernel: smb: client: fix UAF and buffer leak in cifs_check_trans2() for malformed secondary T2 — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.
Affected:
No fix planned:
Not affected:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-80947High· 7.0kernel: wifi: rtl8xxxu: fix use-after-free from rx_urb_wq on stop (CVE-2026-80947)
CVE-2026-80981High· 7.0kernel: net/smc: fix use-after-free of the LLC qentry in smc_llc_srv_add_link() (CVE-2026-80981)
CVE-2026-89441Medium· 5.5kernel: mmc: via-sdmmc: cancel card-detect work on remove (CVE-2026-89441)
CVE-2026-89675High· 7.0kernel: nfsd: fix UAF in async copy cancel and shutdown (CVE-2026-89675)
CVE-2026-89478High· 7.0kernel: sctp: drop a chunk if its transport was removed (CVE-2026-89478)
CVE-2026-89479High· 7.0kernel: sctp: stop processing a packet once its association is deleted (CVE-2026-89479)