9.8

CVE-2026-43493: crypto: pcrypt - Fix handling of MAY_BACKLOG requests

Modified
AliasesUBUNTU-CVE-2026-43493DEBIAN-CVE-2026-43493
Published 19-05-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-43493 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 52.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.68%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 64 · Related 59
LSN-0121-1LSN-0122-1MGASA-2026-0174MGASA-2026-0177OPENSUSE-SU-2026:10859-1OPENSUSE-SU-2026:21555-1

Timeline

  1. 19-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.68%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

Increase +0.13 pp

From 0.55% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu159 products
  • linux< 3.13.0-215.266 | < 4.4.0-284.318 | < 4.15.0-254.266 | < 5.4.0-234.254 | < 5.15.0-185.195 | < 6.8.0-134.134 | < 6.17.0-40.40 | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1157.163 | < 4.4.0-1195.210 | < 4.15.0-1195.208 | < 5.4.0-1162.173 | < 5.15.0-1111.118 | < 6.8.0-1060.63 | < 6.17.0-1019.19 | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < ae7e95638d956d556d74b9abb9e780d3bd3dcd9e | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < 1d7f07df450bac3301938fbc4251f2611be4084e | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < 76641449b28979ebd6c02e9598367e119e385236 | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < 9f1cbca178c03188e201ed175251372149bb25f2 | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < eb34e243df57e32f4c08fa191f3602ea19076276 | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < 77d55bc8675ee851ed639dc9be77325a8024cf67 | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < 46271895ddfb1ba41f89f7e0dffbe9c2bcf7380a | ≥ 5a1436beec5744029f3ac90b6fe71a698dcd6155, < 915b692e6cb723aac658c25eb82c58fd81235110 | 2.6.34
  • linux_kernel≥ 2.6.34, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.140 | ≥ 6.7, < 6.12.86 | ≥ 6.13, < 6.18.27 | ≥ 6.19, < 7.0.4
Debian1 product
  • linux< 6.1.176-1 | < 6.12.86-1 | < 7.0.4-1

3 vendors · 162 products

References

58 links
Show all 58 references