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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于free_choose_arg_map对部分分配不具弹性，可能导致空指针取消引用。

CVSS 7.5 · High EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 5cf9c4a9959b6273675310d14a834ef14fbca37c< 9b3730dabcf3764bfe3ff07caf55e641a0b45234 affected
5cf9c4a9959b6273675310d14a834ef14fbca37c< 851241d3f78a5505224dc21c03d8692f530256b4 affected
5cf9c4a9959b6273675310d14a834ef14fbca37c< ec1850f663da64842614c86b20fe734be070c2ba affected
5cf9c4a9959b6273675310d14a834ef14fbca37c< 8081faaf089db5280c3be820948469f7c58ef8dd affected
5cf9c4a9959b6273675310d14a834ef14fbca37c< c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdf affected
5cf9c4a9959b6273675310d14a834ef14fbca37c< f21c3fdb96833aac2f533506899fe38c19cf49d5 affected
5cf9c4a9959b6273675310d14a834ef14fbca37c< e3fe30e57649c551757a02e1cad073c47e1e075e affected
4.13 affected
… +8 more rows
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I. Basic Information for CVE-2026-22991

Vulnerability Information
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Vulnerability Title
libceph: make free_choose_arg_map() resilient to partial allocation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于free_choose_arg_map对部分分配不具弹性，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5cf9c4a9959b6273675310d14a834ef14fbca37c ~ 9b3730dabcf3764bfe3ff07caf55e641a0b45234 -
Linux Linux 4.13 -

II. Public POCs for CVE-2026-22991

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III. Intelligence Information for CVE-2026-22991

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Same Patch Batch · Linux · 2026-01-23 · 34 CVEs total

CVE-2026-22984 9.8 CRITICAL libceph: prevent potential out-of-bounds reads in handle_auth_done()
CVE-2025-71159 9.8 CRITICAL btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()
CVE-2026-22980 7.8 HIGH nfsd: provide locking for v4_end_grace
CVE-2025-71145 7.8 HIGH usb: phy: isp1301: fix non-OF device reference imbalance
CVE-2025-71158 7.8 HIGH gpio: mpsse: ensure worker is torn down
CVE-2026-22988 7.8 HIGH arp: do not assume dev_hard_header() does not change skb->head
CVE-2025-71155 7.8 HIGH KVM: s390: Fix gmap_helper_zap_one_page() again
CVE-2025-71146 7.5 HIGH netfilter: nf_conncount: fix leaked ct in error paths
CVE-2025-71161 7.5 HIGH dm-verity: disable recursive forward error correction
CVE-2026-22990 7.5 HIGH libceph: replace overzealous BUG_ON in osdmap_apply_incremental()
CVE-2026-22992 7.5 HIGH libceph: return the handler error from mon_handle_auth_done()
CVE-2025-71150 7.5 HIGH ksmbd: Fix refcount leak when invalid session is found on session lookup
CVE-2026-22989 nfsd: check that server is running in unlock_filesystem
CVE-2026-22987 net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy
CVE-2026-22993 idpf: Fix RSS LUT NULL ptr issue after soft reset
CVE-2026-22986 gpiolib: fix race condition for gdev->srcu
CVE-2026-22985 idpf: Fix RSS LUT NULL pointer crash on early ethtool operations
CVE-2026-22994 bpf: Fix reference count leak in bpf_prog_test_run_xdp()
CVE-2026-22995 ublk: fix use-after-free in ublk_partition_scan_work
CVE-2026-22983 net: do not write to msg_get_inq in callee

Showing top 20 of 34 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-22991

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