CVE-2026-52954: linux Reachable Assertion
Vulnerability summary
CVE-2026-52954 is a high (CVSS 7.5) Reachable Assertion vulnerability in linux. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 49 · Related 49Timeline
- 24-06-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.52%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
0.00 pp
From 0.52% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-617Reachable AssertionThe product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Affected systems
Ubuntu166 products
- linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < c7bf7864e2924fa5508ac270b0e9364bc13d5a6c | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < f47430fc1f815e87406e2d3b4e476eff1bc7fd9b | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 534ebc08df97c47d4c7596f336fa31ecbf91519c | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 80c73bd1b2b04355d1d0c29be8ccbd25a380905d | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 4d2b37abda9536808655830d683dc491d31741a8 | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3 | ≥ 5cf9c4a9959b6273675310d14a834ef14fbca37c, < d289478cfc0bcf81c7914200d6abdcb78bd04ded | 4.13
- linux_kernel≥ 4.13, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.141 | ≥ 6.7, < 6.12.91 | ≥ 6.13, < 6.18.33 | ≥ 6.19, < 7.0.10 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.10-1
3 vendors · 169 products
