Critical severity · published May 19, 2026
CVE-2026-43493
crypto: pcrypt - Fix handling of MAY_BACKLOG requests
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
crypto: pcrypt - Fix handling of MAY_BACKLOG requests
MAY_BACKLOG requests can return EBUSY. Handle them by checking
for that value and filtering out EINPROGRESS notifications.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.34 before 5.10.258; 5.11 before 5.15.209; 5.16 before 6.1.175; 6.2 before 6.6.140; 6.7 before 6.12.86; 6.13 before 6.18.27; +1 more · source: NVD
LI
Linux · Linux
5a1436beec5744029f3ac90b6fe71a698dcd6155 before ae7e95638d956d556d74b9abb9e780d3bd3dcd9e; 5a1436beec5744029f3ac90b6fe71a698dcd6155 before 1d7f07df450bac3301938fbc4251f2611be4084e; 5a1436beec5744029f3ac90b6fe71a698dcd6155 before 76641449b28979ebd6c02e9598367e119e385236; 5a1436beec5744029f3ac90b6fe71a698dcd6155 before 9f1cbca178c03188e201ed175251372149bb25f2; 5a1436beec5744029f3ac90b6fe71a698dcd6155 before eb34e243df57e32f4c08fa191f3602ea19076276; 5a1436beec5744029f3ac90b6fe71a698dcd6155 before 77d55bc8675ee851ed639dc9be77325a8024cf67; +3 more · source: vendor
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43493
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43493
Patch
https://git.kernel.org/stable/c/1d7f07df450bac3301938fbc4251f2611be4084e
Patch
https://git.kernel.org/stable/c/46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a
Patch
https://git.kernel.org/stable/c/76641449b28979ebd6c02e9598367e119e385236
Patch
https://git.kernel.org/stable/c/77d55bc8675ee851ed639dc9be77325a8024cf67
Patch
https://git.kernel.org/stable/c/915b692e6cb723aac658c25eb82c58fd81235110
Patch
https://git.kernel.org/stable/c/9f1cbca178c03188e201ed175251372149bb25f2
More from Kernel
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
8.8
CVE-2013-6282
Linux Kernel Improper Input Validation Vulnerability
8.4
CVE-2022-0185
Linux Kernel Heap-Based Buffer Overflow Vulnerability
8.4
CVE-2013-2094
Linux Kernel Privilege Escalation Vulnerability