CVE-2024-39301net/9p: fix uninit-value in p9_client_rpc()
- 5.5MediumCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: net/9p: fix uninit-value in p9_client_rpc() Syzbot with the help of KMSAN reported the following error: BUG: KMSAN: uninit-value in trace_9p_client_res include/trace/events/9p.h:146 [inline] BUG: KMSAN: uninit-value in p9_client_rpc+0x1314/0x1340 net/9p/client.c:754 trace_9p_client_res include/trace/events/9p.h:146 [inline] p9_client_rpc+0x1314/0x1340 net/9p/client.c:754 p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031 v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410 v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122 legacy_get_tree+0x114/0x290 fs/fs_context.c:662 vfs_get_tree+0xa7/0x570 fs/super.c:1797 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x742/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was created at: __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0x2de/0x1400 mm/slub.c:2391 ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x6d3/0xbe0 mm/slub.c:3852 p9_tag_alloc net/9p/client.c:278 [inline] p9_client_prepare_req+0x20a/0x1770 net/9p/client.c:641 p9_client_rpc+0x27e/0x1340 net/9p/client.c:688 p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031 v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410 v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122 legacy_get_tree+0x114/0x290 fs/fs_context.c:662 vfs_get_tree+0xa7/0x570 fs/super.c:1797 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x742/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 If p9_check_errors() fails early in p9_client_rpc(), req->rc.tag will not be properly initialized. However, trace_9p_client_res() ends up trying to print it out anyway before p9_client_rpc() finishes. Fix this issue by assigning default values to p9_fcall fields such as 'tag' and (just in case KMSAN unearths something new) 'id' during the tag allocation stage.
Timeline
ID reserved
By Linux
- 1 day later
· 1 day later
Published
- 23 months later
· 23 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < 72c5d8e416ecc46af370a1340b3db5ff0b0cc867
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < 2101901dd58c6da4924bc5efb217a1d83436290b
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < 124947855564572713d705a13be7d0c9dae16a17
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < 89969ffbeb948ffc159d19252e7469490103011b
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < ca71f204711ad24113e8b344dc5bb8b0385f5672
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < 6c1791130b781c843572fb6391c4a4c5d857ab17
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < fe5c604053c36c62af24eee8a76407d026ea5163
- affected 348b59012e5c6402741d067cf6eeeb6271999d06 – < 25460d6f39024cc3b8241b14c7ccf0d6f11a736a
- affected 3.2
- unaffected < 3.2
- unaffected 4.19.316 – ≤ 4.19.*
- unaffected 5.4.278 – ≤ 5.4.*
- unaffected 5.10.219 – ≤ 5.10.*
- unaffected 5.15.161 – ≤ 5.15.*
- unaffected 6.1.94 – ≤ 6.1.*
- unaffected 6.6.34 – ≤ 6.6.*
- unaffected 6.9.5 – ≤ 6.9.*
- unaffected 6.10 – ≤ *
References
References8
- https://git.kernel.org/stable/c/72c5d8e416ecc46af370a1340b3db5ff0b0cc867 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/2101901dd58c6da4924bc5efb217a1d83436290b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/124947855564572713d705a13be7d0c9dae16a17 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/89969ffbeb948ffc159d19252e7469490103011b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/ca71f204711ad24113e8b344dc5bb8b0385f5672 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/6c1791130b781c843572fb6391c4a4c5d857ab17 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/fe5c604053c36c62af24eee8a76407d026ea5163 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/25460d6f39024cc3b8241b14c7ccf0d6f11a736a (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-38020 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-39301)Record last updated .