7.8

CVE-2024-26870: NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102

Modified
AliasesUBUNTU-CVE-2024-26870DEBIAN-CVE-2024-26870
Published 17-04-2024Last modified 15-10-2026

Vulnerability summary

CVE-2024-26870 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.28%
0%100%
Low · 0.00 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 35 · Related 25
DLA-3842-1DSA-5681-1RHSA-2024:5065RHSA-2024:5101RHSA-2024:5102RHSA-2024:5255

Timeline

  1. 17-04-2024
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102 A call to listxattr() with a buffer size = 0 returns the actual size of the buffer needed for a subsequent call. When size > 0, nfs4_listxattr() does not return an error because either generic_listxattr() or nfs4_listxattr_nfs4_label() consumes exactly all the bytes then size is 0 when calling nfs4_listxattr_nfs4_user() which then triggers the following kernel BUG: [ 99.403778] kernel BUG at mm/usercopy.c:102! [ 99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP [ 99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1 [ 99.415827] Call trace: [ 99.415985] usercopy_abort+0x70/0xa0 [ 99.416227] __check_heap_object+0x134/0x158 [ 99.416505] check_heap_object+0x150/0x188 [ 99.416696] __check_object_size.part.0+0x78/0x168 [ 99.416886] __check_object_size+0x28/0x40 [ 99.417078] listxattr+0x8c/0x120 [ 99.417252] path_listxattr+0x78/0xe0 [ 99.417476] __arm64_sys_listxattr+0x28/0x40 [ 99.417723] invoke_syscall+0x78/0x100 [ 99.417929] el0_svc_common.constprop.0+0x48/0xf0 [ 99.418186] do_el0_svc+0x24/0x38 [ 99.418376] el0_svc+0x3c/0x110 [ 99.418554] el0t_64_sync_handler+0x120/0x130 [ 99.418788] el0t_64_sync+0x194/0x198 [ 99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000) Issue is reproduced when generic_listxattr() returns 'system.nfs4_acl', thus calling lisxattr() with size = 16 will trigger the bug. Add check on nfs4_listxattr() to return ERANGE error when it is called with size > 0 and the return value is greater than size.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% 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

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu105 products
  • linux< 5.15.0-112.122 | < 6.8.0-35.35
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1063.69 | < 6.8.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 012a211abd5db098094ce429de5f046368391e68, < 4403438eaca6e91f02d272211c4d6b045092396b | ≥ 012a211abd5db098094ce429de5f046368391e68, < 9d52865ff28245fc2134da9f99baff603a24407a | ≥ 012a211abd5db098094ce429de5f046368391e68, < 06e828b3f1b206de08ef520fc46a40b22e1869cb | ≥ 012a211abd5db098094ce429de5f046368391e68, < 79cdcc765969d23f4e3d6ea115660c3333498768 | ≥ 012a211abd5db098094ce429de5f046368391e68, < 80365c9f96015bbf048fdd6c8705d3f8770132bf | ≥ 012a211abd5db098094ce429de5f046368391e68, < 23bfecb4d852751d5e403557dd500bb563313baf | ≥ 012a211abd5db098094ce429de5f046368391e68, < 251a658bbfceafb4d58c76b77682c8bf7bcfad65 | 5.9
  • linux_kernel≥ 5.9, < 5.10.214 | ≥ 5.11, < 5.15.153 | ≥ 5.16, < 6.1.83 | ≥ 6.2, < 6.6.23 | ≥ 6.7, < 6.7.11 | ≥ 6.8, < 6.8.2

3 vendors · 109 products

References

28 links
Show all 28 references