High 7.5Published Jan 23, 2026

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

Updated under an hour ago (Oct 27, 2026, 9:00 PM ET)

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5cf9c4a9959b6273675310d14a834ef14fbca37c before 9b3730dabcf3764bfe3ff07caf55e641a0b45234; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before 851241d3f78a5505224dc21c03d8692f530256b4; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before ec1850f663da64842614c86b20fe734be070c2ba; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before 8081faaf089db5280c3be820948469f7c58ef8dd; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before f21c3fdb96833aac2f533506899fe38c19cf49d5; from 5cf9c4a9959b6273675310d14a834ef14fbca37c before e3fe30e57649c551757a02e1cad073c47e1e075e	CNA record
linux linux_kernel linux:linux_kernel	from 4.13 before 5.10.248; from 5.11 before 5.15.198; from 5.16 before 6.1.161; from 6.2 before 6.6.121; from 6.7 before 6.12.66; from 6.13 before 6.18.6; 6.19; 6.19; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/9b3730dabcf3764bfe3ff07caf55e641a0b45234	patch
https://git.kernel.org/stable/c/851241d3f78a5505224dc21c03d8692f530256b4	patch
https://git.kernel.org/stable/c/ec1850f663da64842614c86b20fe734be070c2ba	patch
https://git.kernel.org/stable/c/8081faaf089db5280c3be820948469f7c58ef8dd	patch
https://git.kernel.org/stable/c/c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf	patch
https://git.kernel.org/stable/c/f21c3fdb96833aac2f533506899fe38c19cf49d5	patch
https://git.kernel.org/stable/c/e3fe30e57649c551757a02e1cad073c47e1e075e	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.