7.5

CVE-2026-22991: libceph: make free_choose_arg_map() resilient to partial allocation

Modified
AliasesUBUNTU-CVE-2026-22991DEBIAN-CVE-2026-22991
Published 23-01-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-22991 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 40.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · +0.03 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 44 · Related 38
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1MGASA-2026-0097MGASA-2026-0098

Timeline

  1. 23-01-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation free_choose_arg_map() may dereference a NULL pointer if its caller fails after a partial allocation. For example, in decode_choose_args(), if allocation of arg_map->args fails, execution jumps to the fail label and free_choose_arg_map() is called. Since arg_map->size is updated to a non-zero value before memory allocation, free_choose_arg_map() will iterate over arg_map->args and dereference a NULL pointer. To prevent this potential NULL pointer dereference and make free_choose_arg_map() more resilient, add checks for pointers before iterating.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.44% 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.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-117.117
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 9b3730dabcf3764bfe3ff07caf55e641a0b45234 | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 851241d3f78a5505224dc21c03d8692f530256b4 | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < ec1850f663da64842614c86b20fe734be070c2ba | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 8081faaf089db5280c3be820948469f7c58ef8dd | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < f21c3fdb96833aac2f533506899fe38c19cf49d5 | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < e3fe30e57649c551757a02e1cad073c47e1e075e | 4.13
  • linux_kernel≥ 4.13, < 5.10.248 | ≥ 5.11, < 5.15.198 | ≥ 5.16, < 6.1.161 | ≥ 6.2, < 6.6.121 | ≥ 6.7, < 6.12.66 | ≥ 6.13, < 6.18.6 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.8-1

3 vendors · 160 products

References

37 links
Show all 37 references