CVE-2026-93048— mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()
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.
在 Linux 内核中，以下漏洞已得到解决： mtd: part: 在 mtd_add_partition() 中拒绝 MTDPART_OFS_RETAIN 函数并未拒绝特殊的偏移量值 （值为 -3）。当通过 BLKPG ioctl 在 NAND 设备上调用时，这会导致在 中触发 断言。 值的语义依赖于 指向前一个分区的结尾，但在动态分区处理路径中， 实际上就等于偏移量参数本身，从而导致行为未定义。 提交 （"mtd: 为 ioctl 请求准备分区添加和删除函数”）引入了 并正确拒绝了 （-1）和 （-2），因为这
Possible ATT&CK Techniques 3 AI
T1069 · Permission Groups Discovery T1190 · Exploit Public-Facing Application T1200 · Hardware AdditionsAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 1a31368bf92ef2a7da3ba379672c405bd2751df9< 701c3ae7273e1adc20db5d97c42e0139b479f16b |
affected |
1a31368bf92ef2a7da3ba379672c405bd2751df9< 6aaab2ace3f7b55733d904e5549acf8405f03642 |
affected | ||
1a31368bf92ef2a7da3ba379672c405bd2751df9< 181c1bff940e7d3e34ca485d37e3cdbfe409203c |
affected | ||
1a31368bf92ef2a7da3ba379672c405bd2751df9< a536eb57be58442b19398b2783071007ecfb1735 |
affected | ||
1a31368bf92ef2a7da3ba379672c405bd2751df9< e204e5c49a012f99638633fdbd773e3c86260053 |
affected | ||
1a31368bf92ef2a7da3ba379672c405bd2751df9< 398aca2f90122d5abbabff1079deaeb885fe9e40 |
affected | ||
1a31368bf92ef2a7da3ba379672c405bd2751df9< c645f6dd1af2ecc70fd3578e141f2f71fa9e4eff |
affected | ||
1a31368bf92ef2a7da3ba379672c405bd2751df9< b759d5bb6265419344ee9729fd0dc07ad85719d8 |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-93048
Vulnerability Information
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Vulnerability Title
mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()
mtd_add_partition() does not reject the special offset value
MTDPART_OFS_RETAIN (-3), which leads to a WARN_ON in
add_mtd_device() when called through the BLKPG ioctl on NAND
devices. The RETAIN value depends on cur_offset being the end of
the previous partition, but in the dynamic partition path
cur_offset equals the offset argument itself, causing undefined
behavior.
Commit 5daa7b21496a ("mtd: prepare partition add and del functions
for ioctl requests") introduced mtd_add_partition() and correctly
rejected MTDPART_OFS_APPEND (-1) and MTDPART_OFS_NXTBLK (-2),
since those special offsets rely on cur_offset tracking the
previous partition's end. However, commit 1a31368bf92e ("mtd: add a flags
for partitions which should just leave smth. after them")
later added MTDPART_OFS_RETAIN (-3) for the static
partition table path without updating mtd_add_partition() to
also reject this value.
With offset=-3 passed via BLKPG, the RETAIN size calculation in
allocate_partition() underflows (parent_size - 0xFFFFFFFFFFFFFFFD
= parent_size + 3). If the underflow result does not appear to
leave enough space, allocate_partition() jumps to out_register via
goto, skipping erasesize initialization. This results in
erasesize=0, which triggers:
WARN_ON((!mtd->erasesize || !master->_erase) &&
!(mtd->flags & MTD_NO_ERASE))
in add_mtd_device(). If the underflow result appears to leave
enough space, a bogus partition size is calculated, but the
"out of reach" sanity check catches the invalid offset and
creates a disabled empty partition (offset=0, size=0) instead
of returning an error.
Fix this by adding MTDPART_OFS_RETAIN to the rejection list in
mtd_add_partition(), consistent with the existing handling of
APPEND and NXTBLK.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-93048
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-93048 (8)
Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total
| CVE-2026-92489 | 9.8 CRITICAL | xfrm: Fix skb double-free in xfrm_dev_direct_output() |
| CVE-2026-90235 | 9.8 CRITICAL | sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE |
| CVE-2026-90173 | 9.8 CRITICAL | smb: smbdirect: free completion queues with ib_free_cq() |
| CVE-2026-90104 | 9.8 CRITICAL | NFSv4.1: zero referring call lists before decoding |
| CVE-2026-90151 | 9.8 CRITICAL | NFSv4: remove callback IDR entry on client allocation failure |
| CVE-2026-90110 | 9.4 CRITICAL | inetpeer: randomize RB-tree node comparison using SipHash |
| CVE-2026-90230 | 9.1 CRITICAL | nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() |
| CVE-2026-90414 | 9.1 CRITICAL | IB/isert: reject PDUs declaring more data than was received |
| CVE-2026-90413 | 9.1 CRITICAL | IB/isert: reject login PDUs declaring more data than was received |
| CVE-2026-90367 | 8.8 HIGH | wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER |
| CVE-2026-90329 | 8.8 HIGH | HID: synchronize input before cleaning up a failed probe |
| CVE-2026-93189 | 8.8 HIGH | HID: core: quiesce input in hid_hw_stop() to prevent use-after-free |
| CVE-2026-90240 | 8.8 HIGH | iommu/vt-d: Flush context cache with correct SID when tearing down aliases |
| CVE-2026-90357 | 8.8 HIGH | wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement |
| CVE-2026-90286 | 8.8 HIGH | drm/amdgpu/gfx6: Use PFP on the compute queues too |
| CVE-2026-93042 | 8.8 HIGH | dmaengine: dw-edma: Terminate all descriptors without callbacks |
| CVE-2026-90256 | 8.8 HIGH | Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind |
| CVE-2026-90380 | 8.8 HIGH | wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete |
| CVE-2026-90381 | 8.8 HIGH | wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx() |
| CVE-2026-90425 | 8.8 HIGH | iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID |
Showing top 20 of 600 CVEs. View all on vendor page → →
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